KarrLab/bpforms

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bpforms/alphabet/protein.yml

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id: protein
name: Protein amino acids
description: The canonical protein amino acids, plus non-canonical amino acids based
  on <a href="http://www.wwpdb.org/data/ccd">PDB Chemical Component Dictionary</a>
  and <a href="https://pir.georgetown.edu/resid">RESID</a>
monomers:
  A:
    id: Ala
    name: L-alanine
    synonyms:
    - (S)-alpha-Amino-beta-phenylpropionic acid
    - L-alanine
    - alanine
    - (S)-2-Amino-3-phenylpropionic acid
    - 3-phenyl-L-alanine
    - β-phenyl-L-alanine
    - (2S)-2-aminopropanoic acid
    - A
    identifiers:
    - ns: pdb-ccd
      id: ALA
    - ns: metacyc.compound
      id: L-ALPHA-ALANINE
    - ns: resid
      id: AA0001
    - ns: chebi
      id: CHEBI:46217
    - ns: chebi
      id: CHEBI:16977
    - ns: pubchem.compound
      id: '5950'
    structure: C[C@H]([NH3+])C(=O)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  R:
    id: Arg
    name: L-arginine
    synonyms:
    - (S)-alpha-Amino-beta-phenylpropionic acid
    - arginine
    - '[amino-[[(4S)-4-amino-5-hydroxy-5-oxo-pentyl]amino]methylidene]azanium'
    - amino{[(4S)-4-amino-4-carboxybutyl]amino}methaniminium
    - (S)-2-Amino-3-phenylpropionic acid
    - 3-phenyl-L-alanine
    - β-phenyl-L-alanine
    - R
    identifiers:
    - ns: chebi
      id: CHEBI:16467
    - ns: pubchem.compound
      id: '6322'
    - ns: metacyc.compound
      id: ARG
    - ns: pdb-ccd
      id: ARG
    - ns: chebi
      id: CHEBI:29952
    - ns: resid
      id: AA0002
    structure: OC(=O)[C@H](CCCNC(=[NH2+])N)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
    - molecule: Monomer
      element: H
      position: 15
  N:
    id: Asn
    name: L-asparagine
    synonyms:
    - L-Asparagine
    - L-aspartic acid beta-amide
    - L-Asparagin
    - asparagine
    - (2S)-2,4-diamino-4-oxobutanoic acid
    - L-asparagine
    - (S)-Asparagine
    - L-2-aminosuccinamic acid
    - N
    - (2S)-2,4-bis(azanyl)-4-oxidanylidene-butanoic acid
    - Aspartamic acid
    - (2S)-2-amino-3-carbamoylpropanoic acid
    - (S)-2-amino-3-carbamoylpropanoic acid
    - alpha-aminosuccinamic acid
    - 2-Aminosuccinamic acid
    identifiers:
    - ns: pdb-ccd
      id: ASN
    - ns: chebi
      id: CHEBI:17196
    - ns: metacyc.compound
      id: ASN
    - ns: resid
      id: AA0003
    - ns: chebi
      id: CHEBI:50347
    - ns: pubchem.compound
      id: '6267'
    structure: NC(=O)C[C@@H](C(=O)O)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
    - molecule: Monomer
      element: H
      position: 10
  D:
    id: Asp
    name: L-aspartic acid
    synonyms:
    - D
    - (S)-2-aminosuccinic acid
    - L-aspartic acid
    - 2-Aminosuccinic acid
    - (2S)-2-azanylbutanedioic acid
    - aspartic acid
    - (S)-2-aminobutanedioic acid
    - L-Asparaginsaeure
    identifiers:
    - ns: resid
      id: AA0004
    - ns: pdb-ccd
      id: ASP
    - ns: pubchem.compound
      id: '5960'
    - ns: metacyc.compound
      id: ASP
    - ns: chebi
      id: CHEBI:17053
    - ns: chebi
      id: CHEBI:29958
    structure: O=C[C@H](CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  C:
    id: Cys
    name: L-cysteine
    synonyms:
    - (2R)-2-amino-3-sulfanylpropanoic acid
    - E 920
    - E-920
    - L-Zystein
    - E920
    - (2R)-2-amino-3-mercaptopropanoic acid
    - (R)-2-amino-3-mercaptopropanoic acid
    - L-2-Amino-3-mercaptopropionic acid
    identifiers:
    - ns: chebi
      id: CHEBI:17561
    - ns: resid
      id: AA0005
    - ns: pubchem.compound
      id: '5862'
    - ns: chebi
      id: CHEBI:29950
    - ns: metacyc.compound
      id: CYS
    structure: OC(=O)[C@@H]([NH3+])CS
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  Q:
    id: Gln
    name: L-glutamine
    synonyms:
    - (2S)-2,5-diamino-5-oxopentanoic acid
    - L-(+)-glutamine
    - Glutamic acid 5-amide
    - (2S)-2,5-diamino-5-oxo-pentanoic acid
    - Glutamic acid amide
    - glutamine
    - L-2-Aminoglutaramic acid
    - L-glutamine
    - (2S)-2-amino-4-carbamoylbutanoic acid
    - Levoglutamide
    - L-2-aminoglutaramic acid
    - L-glutamic acid gamma-amide
    - L-Glutaminsaeure-5-amid
    - (S)-2,5-diamino-5-oxopentanoic acid
    - Q
    identifiers:
    - ns: resid
      id: AA0007
    - ns: pubchem.compound
      id: '5961'
    - ns: chebi
      id: CHEBI:18050
    - ns: pdb-ccd
      id: GLN
    - ns: chebi
      id: CHEBI:30011
    - ns: metacyc.compound
      id: GLN
    structure: NC(=O)CC[C@@H](C(=O)O)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  E:
    id: Glu
    name: L-glutamic acid
    synonyms:
    - (S)-glutamic acid
    - (2S)-2-azanylpentanedioic acid
    - L-glutamic acid
    - E
    - (S)-2-aminopentanedioic acid
    - L-Glutaminic acid
    - glutamic acid
    - L-Glutaminsaeure
    - Glutamate
    identifiers:
    - ns: resid
      id: AA0006
    - ns: pubchem.compound
      id: '33032'
    - ns: chebi
      id: CHEBI:29972
    - ns: metacyc.compound
      id: GLU
    - ns: chebi
      id: CHEBI:16015
    - ns: pdb-ccd
      id: GLU
    structure: O=C[C@H](CCC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  G:
    id: Gly
    name: glycine
    synonyms:
    - aminoethanoic acid
    - Aminoacetic acid
    identifiers:
    - ns: chebi
      id: CHEBI:29947
    - ns: resid
      id: AA0008
    - ns: metacyc.compound
      id: GLY
    - ns: chebi
      id: CHEBI:15428
    - ns: pubchem.compound
      id: '750'
    structure: OC(=O)C[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  H:
    id: His
    name: L-histidine
    synonyms:
    - histidine
    - L-(-)-histidine
    - (2S)-2-amino-3-(1H-imidazol-3-ium-4-yl)propanoic acid
    - H
    - (S)-alpha-amino-1H-Imidazole-4-propanoic acid
    - (S)-4-(2-Amino-2-carboxyethyl)imidazole
    - 3-(1H-imidazol-3-ium-4-yl)-L-alanine
    - (S)-alpha-Amino-1H-imidazole-4-propionic acid
    identifiers:
    - ns: pdb-ccd
      id: HIS
    - ns: resid
      id: AA0009
    - ns: pubchem.compound
      id: '33032'
    - ns: chebi
      id: CHEBI:29979
    - ns: metacyc.compound
      id: HIS
    - ns: chebi
      id: CHEBI:15971
    structure: OC(=O)[C@@H]([NH3+])Cc1cnc[nH]1
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  I:
    id: Ile
    name: L-isoleucine
    synonyms:
    - alpha-amino-beta-methylvaleric acid
    - I
    - (2S,3S)-2-amino-3-methyl-pentanoic acid
    - L-isoleucine
    - (2S,3S)-2-amino-3-methylpentanoic acid
    - 2-Amino-3-methylvaleric acid
    - isoleucine
    identifiers:
    - ns: pubchem.compound
      id: '6306'
    - ns: pdb-ccd
      id: ILE
    - ns: metacyc.compound
      id: ILE
    - ns: chebi
      id: CHEBI:17191
    - ns: resid
      id: AA0010
    - ns: chebi
      id: CHEBI:30009
    structure: CC[C@@H]([C@@H](C(=O)O)[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  L:
    id: Leu
    name: L-leucine
    synonyms:
    - L-leucine
    - (2S)-alpha-Leucine
    - (2S)-2-amino-4-methylpentanoic acid
    - (2S)-2-amino-4-methyl-pentanoic acid
    - leucine
    - 2-Amino-4-methylvaleric acid
    - L
    - (S)-leucine
    - (2S)-alpha-2-Amino-4-methylvaleric acid
    - (S)-(+)-leucine
    identifiers:
    - ns: chebi
      id: CHEBI:15603
    - ns: pubchem.compound
      id: '6106'
    - ns: metacyc.compound
      id: LEU
    - ns: chebi
      id: CHEBI:30006
    - ns: pdb-ccd
      id: LEU
    - ns: resid
      id: AA0011
    structure: '[NH3+][C@H](C(=O)O)CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  K:
    id: Lys
    name: L-lysine
    synonyms:
    - 6-ammonio-L-norleucine
    - K
    - lysine
    - '[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]azanium'
    identifiers:
    - ns: chebi
      id: CHEBI:18019
    - ns: pubchem.compound
      id: '5962'
    - ns: resid
      id: AA0012
    - ns: metacyc.compound
      id: LYS
    - ns: pdb-ccd
      id: LYS
    - ns: chebi
      id: CHEBI:29967
    structure: '[NH3+]CCCC[C@@H](C(=O)O)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  M:
    id: Met
    name: L-methionine
    synonyms:
    - (2S)-2-amino-4-(methylsulfanyl)butanoic acid
    - (S)-methionine
    - (2S)-2-amino-4-methylsulfanyl-butanoic acid
    - (S)-2-amino-4-(methylthio)butyric acid
    - (S)-2-amino-4-(methylthio)butanoic acid
    - L-alpha-amino-gamma-methylmercaptobutyric acid
    - methionine
    - M
    - L-methionine
    - L-(-)-methionine
    identifiers:
    - ns: metacyc.compound
      id: MET
    - ns: resid
      id: AA0013
    - ns: pdb-ccd
      id: MET
    - ns: chebi
      id: CHEBI:16044
    - ns: chebi
      id: CHEBI:16643
    - ns: pubchem.compound
      id: '6137'
    structure: CSCC[C@H]([NH3+])C(=O)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  F:
    id: Phe
    name: L-phenylalanine
    synonyms:
    - (S)-alpha-Amino-beta-phenylpropionic acid
    - (S)-2-Amino-3-phenylpropionic acid
    - 3-phenyl-L-alanine
    - F
    - β-phenyl-L-alanine
    - (2S)-2-amino-3-phenyl-propanoic acid
    - L-phenylalanine
    - phenylalanine
    identifiers:
    - ns: pubchem.compound
      id: '22848660'
    - ns: pdb-ccd
      id: PHE
    - ns: chebi
      id: CHEBI:29997
    - ns: metacyc.compound
      id: PHE
    - ns: resid
      id: AA0014
    - ns: chebi
      id: CHEBI:17295
    structure: '[NH3+][C@H](C(=O)O)Cc1ccccc1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  P:
    id: Pro
    name: L-proline
    synonyms:
    - (S)-pyrrolidine-2-carboxylic acid
    - L-proline
    - L-(-)-proline
    - (S)-2-carboxypyrrolidine
    - L-alpha-pyrrolidinecarboxylic acid
    - (-)-proline
    - L-pyrrolidine-2-carboxylic acid
    - (S)-2-pyrrolidinecarboxylic acid
    - proline
    - P
    - (-)-(S)-proline
    - (2S)-pyrrolidine-2-carboxylic acid
    - 2-Pyrrolidinecarboxylic acid
    - (-)-2-pyrrolidinecarboxylic acid
    identifiers:
    - ns: resid
      id: AA0015
    - ns: chebi
      id: CHEBI:17203
    - ns: metacyc.compound
      id: PRO
    - ns: chebi
      id: CHEBI:50342
    - ns: pubchem.compound
      id: '145742'
    - ns: pdb-ccd
      id: PRO
    structure: OC(=O)[C@@H]1CCC[NH2+]1
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  S:
    id: Ser
    name: L-serine
    synonyms:
    - L-serine
    - L-2-Amino-3-hydroxypropionic acid
    - (2S)-2-amino-3-hydroxypropanoic acid
    - (S)-2-amino-3-hydroxypropanoic acid
    - (S)-serine
    - (S)-(-)-serine
    - (2S)-2-amino-3-hydroxy-propanoic acid
    - L-(-)-serine; beta-Hydroxyalanine
    - L-3-Hydroxy-alanine
    - S
    - serine
    - (S)-alpha-Amino-beta-hydroxypropionic acid
    - L-3-Hydroxy-2-aminopropionic acid
    - beta-Hydroxy-L-alanine
    identifiers:
    - ns: chebi
      id: CHEBI:17115
    - ns: chebi
      id: CHEBI:29999
    - ns: resid
      id: AA0016
    - ns: metacyc.compound
      id: SER
    - ns: pubchem.compound
      id: '5951'
    - ns: pdb-ccd
      id: SER
    structure: OC[C@@H](C(=O)O)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  T:
    id: Thr
    name: L-threonine
    synonyms:
    - threonine
    - 2-Amino-3-hydroxybutyric acid
    - T
    - L-(-)-Threonine
    - L-threonine
    - (2S,3R)-2-amino-3-hydroxybutanoic acid
    - (2S,3R)-(-)-Threonine
    - L-2-Amino-3-hydroxybutyric acid
    - (2S,3R)-2-amino-3-hydroxy-butanoic acid
    - L-alpha-amino-beta-hydroxybutyric acid
    - (2S)-threonine
    identifiers:
    - ns: pdb-ccd
      id: THR
    - ns: metacyc.compound
      id: THR
    - ns: pubchem.compound
      id: '6288'
    - ns: resid
      id: AA0017
    - ns: chebi
      id: CHEBI:30013
    - ns: chebi
      id: CHEBI:16857
    structure: C[C@H]([C@@H](C(=O)O)[NH3+])O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  W:
    id: Trp
    name: L-tryptophan
    synonyms:
    - (S)-α-amino-1H-indole-3-propanoic acid
    - (S)-tryptophan
    - tryptophan
    - L-(−)-tryptophan
    - (S)-alpha-Amino-beta-(3-indolyl)-propionic acid
    - W
    - (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
    - L-tryptophan
    - L-β-3-indolylalanine
    identifiers:
    - ns: chebi
      id: CHEBI:29954
    - ns: pdb-ccd
      id: TRP
    - ns: resid
      id: AA0018
    - ns: metacyc.compound
      id: TRP
    - ns: pubchem.compound
      id: '6305'
    - ns: chebi
      id: CHEBI:16828
    structure: OC(=O)[C@H](Cc1c[nH]c2c1cccc2)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  Y:
    id: Tyr
    name: L-tyrosine
    synonyms:
    - (S)-2-Amino-3-(p-hydroxyphenyl)propionic acid
    - (-)-alpha-amino-p-hydroxyhydrocinnamic acid
    - 4-hydroxy-L-phenylalanine
    - L-tyrosine
    - (S)-Tyrosine
    - (S)-3-(p-Hydroxyphenyl)alanine
    - (2S)-2-amino-3-(4-hydroxyphenyl)propanoic acid
    - tyrosine
    - Y
    - (S)-(-)-Tyrosine
    - (S)-alpha-amino-4-hydroxybenzenepropanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TYR
    - ns: chebi
      id: CHEBI:46858
    - ns: resid
      id: AA0019
    - ns: chebi
      id: CHEBI:17895
    - ns: metacyc.compound
      id: TYR
    - ns: pubchem.compound
      id: '6057'
    structure: OC(=O)[C@H](Cc1ccc(cc1)O)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  V:
    id: Val
    name: L-valine
    synonyms:
    - (S)-valine
    - 2-Amino-3-methylbutyric acid
    - V
    - L-(+)-alpha-Aminoisovaleric acid
    - (2S)-2-amino-3-methylbutanoic acid
    - valine
    - L-valine
    - (2S)-2-amino-3-methyl-butanoic acid
    - L-alpha-Amino-beta-methylbutyric acid
    identifiers:
    - ns: chebi
      id: CHEBI:30015
    - ns: metacyc.compound
      id: VAL
    - ns: resid
      id: AA0020
    - ns: pubchem.compound
      id: '6287'
    - ns: chebi
      id: CHEBI:16414
    - ns: pdb-ccd
      id: VAL
    structure: '[NH3+]C(C(=O)O)C(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0318:
    id: AA0318
    name: L-lysine methyl ester
    comments: 'Generating Enzyme: protein-lysine O-methyltransferase (EC 2.1.1.-).'
    synonyms:
    - 2,6-diaminohexanoic methyl ester
    - methyl L-lysinate
    - methyl (S)-2,6-diaminohexanoate
    - alpha,epsilon-diaminocaproic methyl ester
    identifiers:
    - ns: mod
      id: MOD:00323
    - ns: go
      id: GO:0042034
    - ns: cas
      id: 687-64-9
    - ns: chebi
      id: CHEBI:21354
    - ns: resid
      id: AA0318
    structure: COC(=O)[C@@H]([NH3+])CCCC[NH3+]
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  AA0567:
    id: AA0567
    name: N6-(2-butenonyl)-L-lysine
    comments: A metabolic source for crotonic acid or crotonyl-CoA in the nucleus
      is not evident, and a responsible enzyme activity is not identified.
    synonyms:
    - N6-crotonyllysine
    - N6-[(2E)-2-butenoyl]-L-lysine
    - N(epsilon)-crotonyllysine
    - N6-(E)-crotonyllysine
    - (2S)-2-amino-6-[(2E)-but-2-enoylamino]hexanoic acid
    - (2S)-2-azanyl-6-[(2E)-but-2-enoylazanyl]hexanoic acid
    - N6-trans-crotonyllysine
    - (2S)-2-amino-6-[(2E)-but-2-enamido]hexanoic acid
    identifiers:
    - ns: resid
      id: AA0567
    - ns: mod
      id: MOD:01892
    structure: C/C=C/C(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0037:
    id: AA0037
    name: O-phospho-L-serine
    comments: 'Generating Enzyme: protein-serine kinase (EC 2.7.1.37).'
    synonyms:
    - (2S)-2-amino-3-phosphonooxy-propanoic acid
    - serine phosphate ester
    - O3-phosphoserine
    - 2-azanyl-3-(phosphonooxy)propanoic acid
    - (2S)-2-amino-3-(phosphonooxy)propanoic acid
    - 2-amino-3-hydroxypropanoic acid 3-phosphate
    - O-phosphonoserine
    - phosphoserine
    - O-phosphono-L-serine
    - S
    identifiers:
    - ns: resid
      id: AA0037
    - ns: pdb-ccd
      id: SEP
    - ns: mod
      id: MOD:00046
    - ns: chebi
      id: CHEBI:45522
    - ns: cas
      id: 407-41-0
    - ns: go
      id: GO:0018105
    - ns: pdb.ligand
      id: SEP
    structure: OC(=O)[C@H](COP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0048:
    id: AA0048
    name: N2-acetyl-L-lysine
    comments: The occurrence of this modification has not been confirmed. The common
      peptide alpha-N-acetyltransferase does not acetylate basic residues.
    synonyms:
    - 2-acetylazanyl-6-azanylhexanoic acid
    - N2-acetyllysine
    - 2-acetylamino-6-aminohexanoic acid
    - (2S)-2-acetamido-6-aminohexanoic acid
    identifiers:
    - ns: mod
      id: MOD:00057
    - ns: resid
      id: AA0048
    - ns: go
      id: GO:0017195
    - ns: cas
      id: 1946-82-3
    structure: CC(=O)N[C@H](C(=O)O)CCCC[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  M, W, Y:
    id: AA0348
    name: S-[5'-(L-tryptoph-6'-yl)-L-tyrosin-3'-yl]-L-methionin-S-ium
    comments: This modification is produced auto-catalytically.
    synonyms:
    - 5'-(6'-tryptophyl)-tyrosin-3'-yl-methionin-S-ium
    identifiers:
    - ns: go
      id: GO:0050739
    - ns: resid
      id: AA0348
    - ns: mod
      id: MOD:00353
    structure: O=C[C@H](CC[S@](c1cc(C[C@@H](C(=O)O)N)cc(c1O)c1ccc2c(c1)[nH]cc2C[C@@H](C=O)N)C)N
    base_monomers:
    - W
    - M
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0421:
    id: AA0421
    name: N4-glucosyl-L-asparagine
    comments: The alpha anomeric form is shown. See also RESID:AA0151 and RESID:AA0420
      for other N4-glycosylated asparagines.
    synonyms:
    - (2S)-2-amino-4-(D-glucopyranosyl)amino-4-oxobutanoic acid
    - N4-glycosylasparagine
    - N4-(D-glucopyranosyl)-L-asparagine
    - N4-glycosyl-L-asparagine
    - N4-asparagine-glucoside
    - N4-glucosylasparagine
    identifiers:
    - ns: mod
      id: MOD:00833
    - ns: resid
      id: AA0421
    structure: OC[C@H]1O[C@H](NC(=O)C[C@@H](C(=O)O)N)[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0560:
    id: AA0560
    name: S-(N-acetylamino)glucosyl-L-cysteine
    comments: See also RESID:AA0152 and RESID:AA0392 for other S-glycosylated cysteines.
    synonyms:
    - S-[beta-D-(N-acetylamino)glucopyranosyl]cysteine
    - (2R)-2-amino-3-(2-acetamido-2-deoxy-beta-D-glucopyranosylsulfanyl)propanoic
      acid
    - S-[(N-acetylamino)glycosyl]cysteine
    identifiers:
    - ns: chebi
      id: CHEBI:61631
    - ns: cas
      id: 10036-64-3
    - ns: mod
      id: MOD:01858
    - ns: resid
      id: AA0560
    structure: OC[C@H]1O[C@@H](SC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0172:
    id: AA0172
    name: O4'-sulfo-L-tyrosine
    comments: 'Generating Enzyme: protein-tyrosine sulfotransferase (EC 2.8.2.20).'
    synonyms:
    - (2S)-2-azanyl-3-(4-sulfooxyphenyl)propanoic acid
    - tyrosine-O-sulphonic acid
    - 2-amino-3-(4-hydroxyphenyl)propanoic acid 4'-sulfate
    - tyrosine sulfate
    - O4-sulfotyrosine
    - Y
    - tyrosine-O-sulfonic acid
    - o-sulfo-l-tyrosine
    - O-sulfo-L-tyrosine
    - (S)-2-amino-3-(4-sulfooxyphenyl)propanoic acid
    identifiers:
    - ns: pdb.ligand
      id: TYS
    - ns: pdb-ccd
      id: TYS
    - ns: go
      id: GO:0006478
    - ns: cas
      id: 956-46-7
    - ns: resid
      id: AA0172
    - ns: mod
      id: MOD:00181
    structure: OC(=O)[C@H](Cc1ccc(cc1)OS(=O)(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0231:
    id: AA0231
    name: N4-(ADP-ribosyl)-L-asparagine
    comments: 'It is not known whether botulinum exoenzyme C3 catalyzes formation
      of the alpha or beta isomer. The alpha form is presented. The keyword "phosphoprotein"
      is not used with toxin modification. Generating Enzyme: NAD(P)+--asparagine
      ADP-ribosyltransferase (EC 2.4.2.-).'
    synonyms:
    - N4-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-asparagine
    - (S)-2-amino-4-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]amino)-4-oxobutanoic
      acid
    - N4-alpha-D-ribofuranosyl-L-asparagine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    identifiers:
    - ns: mod
      id: MOD:00236
    - ns: go
      id: GO:0006471
    - ns: resid
      id: AA0231
    structure: O=C(N[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[O-])C[C@@H](C(=O)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 50
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 53
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 52
    - molecule: Monomer
      element: H
      position: 52
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 53
  AA0150:
    id: AA0150
    name: O3-phosphopantetheine-L-serine
    comments: 'Generating Enzyme: holo-[acyl-carrier-protein] synthase (EC 2.7.8.7).'
    synonyms:
    - (2R)-2-hydroxy-3,3-dimethyl-4-[(2S)-2-amino-2-carboxyethyl]phosphonato-N-(3-oxo-3-[(2-sulfanylethyl)amino]propyl)butanamide
    identifiers:
    - ns: pdb.ligand
      id: PNS
    - ns: mod
      id: MOD:00159
    - ns: resid
      id: AA0150
    - ns: go
      id: GO:0018070
    structure: SCCNC(=O)CCNC(=O)[C@H](C(COP(=O)(OC[C@@H](C(=O)O)[NH3+])[O-])(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
    - molecule: Monomer
      element: H
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  AA0238:
    id: AA0238
    name: L-cysteine oxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a serine hydroxyl with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-serine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-(1-azanyl-2-sulfanylethyl)-4-oxazolecarboxylic acid
    - 2-[(1R)-1-amino-2-sulfanylethyl]-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0238
    - ns: go
      id: GO:0018132
    - ns: mod
      id: MOD:00243
    structure: N[C@H](c1nc(co1)C(=O)O)CS
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
  AA0062:
    id: AA0062
    name: N,N,N-trimethyl-L-alanine
    comments: 'Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12 concerning
      calculation of the difference formula. Generating Enzyme: ribosomal protein
      L11 methyltransferase prmA (EC 2.1.1.-); N-terminal RCC1 methyltransferase (EC
      2.1.1.-).'
    synonyms:
    - (1S)-1-carboxy-N,N,N-trimethylethanaminium
    - N,N,N-trimethylalaninium
    - (1S)-1-carboxy-N,N,N-trimethylethanazanium
    - N,N,N-trimethylalanine cation
    - (2S)-2-(trimethylammonio)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018011
    - ns: resid
      id: AA0062
    - ns: mod
      id: MOD:00071
    - ns: cas
      id: 44802-94-0
    structure: C[C@H]([N](C)(C)C)C(=O)O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
  AA0177:
    id: AA0177
    name: 3',3'',5'-triiodo-L-thyronine
    synonyms:
    - 4-(4-hydroxy-3-iodophenoxy)-3,5-diiodo-L-phenylalanine
    - T3
    - O-(4-hydroxy-3-iodophenyl)-3,5-diiodo-L-tyrosine
    - liothyronine
    - 3,5,3'-triiodo-L-thyronine
    - 3,3',5-triiodo-L-thyronine
    - (S)-2-amino-3-[4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl]propanoic acid
    identifiers:
    - ns: cas
      id: 6893-02-3
    - ns: pdb.ligand
      id: T3
    - ns: go
      id: GO:0018078
    - ns: chebi
      id: CHEBI:18258
    - ns: resid
      id: AA0177
    - ns: mod
      id: MOD:00186
    structure: OC(=O)[C@H](Cc1cc(I)c(c(c1)I)Oc1ccc(c(c1)I)O)[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  AA0530:
    id: AA0530
    name: N6-(lysyl)-L-Lysine
    comments: 'This modification occurs transiently in prokaryotic elogation factor
      P during production of the mature protein. For the mature form of the EF-P modification,
      see RESID:AA0531. The modified lysine residue is homologous to the lysine modified
      to hypusine (see RESID:AA0116) in eukaryotic and archaeal translation initiation
      factor 5A. Generating Enzyme: translation elongation factor P-lysine N6-lysyltransferase
      YjeA (EC 2.3.2.-).'
    synonyms:
    - (2S)-2-amino-6-([(2S)-2,6-diaminohexanoyl]amino)hexanoic acid
    - N6-(alpha-lysyl)-lysine
    identifiers:
    - ns: mod
      id: MOD:01779
    - ns: go
      id: GO:0071915
    - ns: resid
      id: AA0530
    structure: '[NH3+]CCCC[C@@H](C(=O)NCCCC[C@@H](C(=O)O)[NH3+])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  AA0577:
    id: AA0577
    name: O4'-(N-acetylamino)galactosyl-L-tyrosine
    comments: 'The alpha anomeric form is shown. See also RESID:AA0157 for other O-glycosylated
      tyrosines. Generating Enzyme: polypeptide N-acetylgalactosaminyltransferase
      (EC 2.4.1.-).'
    synonyms:
    - mucin type O-glycosyltyrosine
    - (2S)-2-amino-3-(D-2-acetamido-2-deoxygalactopyranosyloxy)phenylpropanoic acid
    - O4'-glycosyl-L-tyrosine
    - O4'-(N-acetylgalactosaminyl)tyrosine
    identifiers:
    - ns: resid
      id: AA0577
    - ns: mod
      id: MOD:01916
    structure: OC[C@@H]1O[C@H](Oc2ccc(cc2)C[C@@H](C(=O)O)[NH3+])[C@H]([C@H]([C@H]1O)O)NC(=O)C
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0611:
    id: AA0611
    name: S-(gamma-glutamyl-cysteinyl-glycyl)-L-cysteine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-amino-5-([(2R)-1-([2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-2-oxoethyl]amino)-1-oxo-3-sulfanylpropan-2-yl]amino)-5-oxopentanoic
      acid
    - S-(glutathion-1-yl)-L-cysteine
    identifiers:
    - ns: mod
      id: MOD:01969
    - ns: resid
      id: AA0611
    structure: O=C[C@H](CSC(=O)CNC(=O)[C@H](NC(=O)CC[C@@H](C(=O)[O-])[NH3+])CS)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  AA0133:
    id: AA0133
    name: S-phytochromobilin-L-cysteine
    comments: The phytochromobilins and phycoerythrobilins transmit red.
    synonyms:
    - 18-ethenyl-3-[1-((2-amino-2-carboxy)ethylsulfanyl)ethyl]-1,2,3,19,22,24-hexahydro-2,7,13,17-tetramethyl-1,19-dioxo-21H-biline-8,12-dipropanoic
      acid
    - (2R,3R)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-18-ethyl-2,7,13,17-tetramethyl-1,2,3,19,21,22,24-heptahydrobilin-1,19(21H,22H,24H)-dione
    - phytochrome chromophore
    - phytochromobilin cysteine adduct
    identifiers:
    - ns: cas
      id: 143392-71-6
    - ns: go
      id: GO:0017012
    - ns: mod
      id: MOD:00142
    - ns: resid
      id: AA0133
    - ns: chebi
      id: CHEBI:15619
    structure: O=C[C@H](CS[C@@H]([C@H]1/C(=C/[C@H]2[NH2+]/C(=C\c3[nH]c(c(c3CCC(=O)[O-])C)/C=C/3\NC(=O)C(=C3C)C=C)/C(=C2C)CCC(=O)[O-])/NC(=O)[C@H]1C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0084:
    id: AA0084
    name: L-aspartic acid 1-amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - l-alpha-asparagine
    - alpha-asparagine
    - 3,4-diamino-4-oxobutanoic acid
    - (2S)-2-amino-1-butanediamic acid
    - isoasparagine
    - N
    - (3S)-3,4-bis(azanyl)-4-oxidanylidene-butanoic acid
    - L-alpha-asparagine
    - 3-amino-succinamic acid
    identifiers:
    - ns: go
      id: GO:0018037
    - ns: mod
      id: MOD:00093
    - ns: chebi
      id: CHEBI:49010
    - ns: resid
      id: AA0084
    - ns: cas
      id: 498-25-9
    - ns: pdb-ccd
      id: XSN
    - ns: pdb.ligand
      id: NH2
    structure: '[O-]C(=O)C[C@@H](C(=O)N)[NH3+]'
    base_monomers:
    - N
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0333:
    id: AA0333
    name: S-cyano-L-cysteine
    comments: This modification is produced naturally when the HypE protein undergoes
      an auto-catalyzed dehydration, using ATP, of its carboxy-terminal S-carbamoyl
      cysteine. See RESID:AA0332.
    synonyms:
    - serine thiocyanic acid ester
    - S-cyano-L-cysteine
    - alpha-amino-beta-thiocyanatopropionic acid
    - (2R)-2-amino-3-thiocyanatopropanoic acid
    - C
    - beta-thiocyanatoalanine
    - S-cyanocysteine
    - (2R)-2-azanyl-3-thiocyanato-propanoic acid
    - s-cyano-l-cysteine
    identifiers:
    - ns: go
      id: GO:0046892
    - ns: pdb-ccd
      id: XCN
    - ns: mod
      id: MOD:00338
    - ns: resid
      id: AA0333
    - ns: cas
      id: 5652-31-3
    structure: N[C@H](C(=O)O)CSC#N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0344:
    id: AA0344
    name: 4-amino-3-isothiazolidinone-L-serine
    comments: 'This cross-link is formed by the condensation of a cysteine sulfenic
      acid with the alpha-amido of the following residue. It can apparently be reversed
      by simple disulfhydryl reduction under physiological conditions. Generating
      Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-[(4R)-4-amino-3-oxo-1,2-thiazolidin-2-yl]-3-hydroxypropanoic acid
    - 2-(4-amino-3-oxo-isothiazolidin-2-yl)-3-hydroxy-propanoic acid
    - serine-cysteine sulphenyl amide cross-link
    - 4-amino-3-isothiazolidinone-L-serine
    - serine-cysteine sulfenyl amide cross-link
    identifiers:
    - ns: resid
      id: AA0344
    - ns: go
      id: GO:0048109
    - ns: mod
      id: MOD:00349
    structure: OC[C@H](N1SC[C@@H](C1=O)[NH3+])C(=O)O
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0088:
    id: AA0088
    name: glycine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - 2-azanylethanamide
    - glycinamide
    - 2-aminoethanamide
    - 2-aminoacetamide
    identifiers:
    - ns: mod
      id: MOD:00097
    - ns: chebi
      id: CHEBI:42843
    - ns: cas
      id: 598-41-4
    - ns: resid
      id: AA0088
    - ns: pdb.ligand
      id: NH2
    - ns: go
      id: GO:0018041
    structure: NC(=O)C[NH3+]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0290:
    id: AA0290
    name: O-octanoyl-L-serine
    comments: 'Generating Enzyme: ghrelin O-acyltransferase, GOAT (EC 2.3.1.-).'
    synonyms:
    - L-serine octanoate ester
    - (2S)-2-amino-3-(octanoyloxy)propanoic acid
    - O3-octanoyl-L-serine
    identifiers:
    - ns: go
      id: GO:0018191
    - ns: mod
      id: MOD:00295
    - ns: resid
      id: AA0290
    structure: CCCCCCCC(=O)OC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0526:
    id: AA0526
    name: S-(coelenterazin-3a-yl)-L-cysteine
    comments: 'Coelenterazine is one of the four major marine luciferins, being used
      by various bioluminescent species in at least eight phyla. Coelenterazine may
      result from modification of a phenylalanyl-tyrosyl-tyrosine peptide produced
      by an unidentified endosymbiotic organism.  See RESID:AA0595. The chirality
      of the cysteine adduct has not been determined. This entry presents coelenterazine
      as a heterogen cross-linked to a cysteine. For coelenterazine as a modification
      produced by the cross-linking of a tripeptide precursor see RESID:AA0595. Generating
      Enzyme: autocatalytic.'
    synonyms:
    - symplectin chromophore
    - dehydrocoelenterazine cysteine adduct
    - (2R)-2-amino-3-([(4-hydroxyphenyl)(8-benzyl-3-oxo-6-[4-hydroxyphenyl]-3,7-dihydroimidazo[1,2-a]pyrazin-2-yl)methyl]sulfanyl)propanoic
      acid
    identifiers:
    - ns: resid
      id: AA0526
    - ns: cas
      id: 55779-48-1
    - ns: chebi
      id: CHEBI:2311
    - ns: mod
      id: MOD:01694
    structure: Oc1ccc(cc1)[C@H](c1nc2n(c1=O)cc([nH]c2Cc1ccccc1)c1ccc(cc1)O)SC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 39
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 42
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 41
    - molecule: Monomer
      element: H
      position: 41
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 42
    - molecule: Monomer
      element: H
      position: 42
      charge: 1
  AA0059:
    id: AA0059
    name: N-myristoyl-glycine
    comments: 'The myristyl group represents a mixture of saturated and unsaturated
      fatty acids. Depending on the membrane composition, fatty acids including C12:0,
      C14:0, C14:1, and C14:2 may be incorporated. This modification is usually co-translational,
      occurring as the protein N-terminal emerges from the ribosome and immediately
      after the initial methionine is cleaved. However, glycine myristoylation can
      in some cases be performed on an N-terminal glycine produced by a post-translational
      proteolytic cleavage. The ExPASy Prosite pattern PS00008 should only be used
      with extreme caution. Because that pattern is not anchored to an N-terminal
      glycine, it extravagantly overpredicts "myristoylation" sites throughout the
      entire length of many protein sequences. Glycine myristoylation can only occur
      once in any protein sequence - at the N-terminal. Generating Enzyme: glycylpeptide
      N-tetradecanoyltransferase (EC 2.3.1.97).'
    synonyms:
    - N-tetradecanoylglycine
    - (tetradecanoylamino)ethanoic acid
    - N-myristylglycine
    - N-(1-oxotetradecyl)glycine
    identifiers:
    - ns: go
      id: GO:0018008
    - ns: resid
      id: AA0059
    - ns: pdb.ligand
      id: MYR
    - ns: cas
      id: 14246-55-0
    - ns: mod
      id: MOD:00068
    structure: CCCCCCCCCCCCCC(=O)NCC(=O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
  AA0119:
    id: AA0119
    name: N6-pyridoxal phosphate-L-lysine
    synonyms:
    - 2-azanyl-6-[(E)-[2-methyl-3-oxidanyl-5-(phosphonooxymethyl)pyridin-4-yl]methylideneamino]hexanoic
      acid
    - (2s)-2-amino-6-[[3-hydroxy-2-methyl-5-(phosphonooxymethyl)pyridin-4-yl]methylideneamino]hexanoic
      acid
    - (E)-N~6~-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methylidene)-L-lysine
    - K
    - (2S)-2-amino-6-[([3-hydroxy-2-methyl-5-phosphonooxymethylpyridin-4-yl]methylidene)amino]hexanoic
      acid
    identifiers:
    - ns: go
      id: GO:0018272
    - ns: cas
      id: 2440-59-7
    - ns: resid
      id: AA0119
    - ns: mod
      id: MOD:00128
    - ns: pdb-ccd
      id: LLP
    - ns: pdb.ligand
      id: LLP
    structure: OC(=O)[C@H](CCCC[NH2+]Cc1c(cnc(c1O)C)COP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 28
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    - molecule: Monomer
      element: H
      position: 28
      charge: 1
  AA0494:
    id: AA0494
    name: N-(DNA-1',2'-dideoxyribos-1'-ylidene)-L-prolinium
    comments: "The modification is frequently referred to as a \"Schiff base\". As\
      \ an iminium bonded to three carbons, this is not a Schiff base, defined in\
      \ the IUPAC Compendium of Chemical Terminology, 2nd ed. (\"the Gold Book\",\
      \ http://goldbook.iupac.org/index.html) as an imine (uncharged, double bonded\
      \ nitrogen) bonded to two carbons. Chemically it is not a \"base\" because it\
      \ cannot act as either a proton acceptor (a \"Brønsted-Lowry base\") or as\
      \ an electron pair donor (a \"Lewis base\"). The model has three open valences,\
      \ one on the proline carboxyl group and two in the DNA nucleotide segment on\
      \ the 5'-phosphate and the 3'-hydroxyl. The keyword \"phosphoprotein\" is not\
      \ used with polynucleotide-linked intermediate modifications. Generating Enzyme:\
      \ formamidopyrimidine-DNA glycosylase (EC 3.2.2.23)."
    synonyms:
    - (1Z,2S)-2-carboxy-1-[(3R,4R)-3,4-dihydroxy-5-(phosphonooxy)pentylidene]pyrrolidinium
    - DNA glycosylase proline Schiff base intermediate [misnomer]
    identifiers:
    - ns: resid
      id: AA0494
    - ns: mod
      id: MOD:01454
    - ns: pdb.ligand
      id: PED
    structure: OP(OC[C@H]([C@H](CC[NH+]1CCC[C@H]1C(=O)O)O)O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
  AA0067:
    id: AA0067
    name: omega-N,omega-N'-dimethyl-L-arginine
    comments: 'This modification should not be confused with omega-N,omega-N-dimethyl-L-arginine
      (see RESID:AA0068) or N2,N2-dimethyl-L-arginine (see RESID:AA0569). Generating
      Enzyme: [myelin basic protein]-arginine N-methyltransferase (EC 2.1.1.126).'
    synonyms:
    - (2S)-2-amino-5-[((methylamino)(methylimino)methyl)amino]pentanoic acid
    - N5-[(methylamino)(methylimino)methyl]ornithine
    - NG,N'G-dimethylarginine
    - symmetric dimethylarginine
    - (2S)-2-amino-5-[(N,N'-dimethylcarbamimidoyl)amino]pentanoic acid
    - n3, n4-dimethylarginine
    - N~5~-(N,N'-dimethylcarbamimidoyl)-L-ornithine
    - N3,N4-dimethylarginine
    - R
    identifiers:
    - ns: pdb.ligand
      id: 2MR
    - ns: cas
      id: 30344-00-4
    - ns: pdb-ccd
      id: 2MR
    - ns: go
      id: GO:0018216
    - ns: mod
      id: MOD:00076
    - ns: chebi
      id: CHEBI:61916
    - ns: resid
      id: AA0067
    structure: CNC(NCCC[C@@H](C(=O)O)[NH3+])NC
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0120:
    id: AA0120
    name: N6-retinylidene-L-lysine
    comments: The all-trans form is shown. Light-induced interconversion with the
      11-cis (4Z) form in rhodopsin is the basis for light sensing in animals. Light-induced
      interconversion with the 13-cis (2Z) form in bacteriorhodopsin is utilized for
      proton pumping in some archaea.
    synonyms:
    - n~6~-[(2z,4e,6e,8e)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraenyl]lysine
    - (2S)-2-amino-6-[[(2E,4Z,6E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexenyl)nona-2,4,6,8-tetraenyl]amino]hexanoic
      acid
    - N6-retinyl-lysine
    - K
    - N6-retinal-L-lysine
    - N~6~-[(2E,4Z,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)nona-2,4,6,8-tetraen-1-yl]-L-lysine
    - (2S)-2-amino-6-[(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-1-en-1-yl)-2,4,6,8-nonatetraenylidene]aminohexanoic
      acid
    identifiers:
    - ns: pdb.ligand
      id: LYR
    - ns: resid
      id: AA0120
    - ns: mod
      id: MOD:00129
    - ns: pdb-ccd
      id: LYR
    - ns: go
      id: GO:0018273
    - ns: cas
      id: 116-31-4
    structure: C[C@@H](/C=C/C=C(/C=C/C1=C(C)CCCC1(C)C)\C)/C=C/[NH2+]CCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 34
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
    - molecule: Monomer
      element: H
      position: 33
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 34
    - molecule: Monomer
      element: H
      position: 34
      charge: 1
  AA0274:
    id: AA0274
    name: N-pyruvic acid 2-iminyl-L-cysteine
    comments: The cysteine sulfhydryl may cyclize with the imine to form 2-methyl-thiazolidine-2,4-dicarboxylic
      acid [CAS:152574-58-8].
    synonyms:
    - (R)-2-(1-carboxy-2-sulfanylethanimino)propanoic acid
    identifiers:
    - ns: resid
      id: AA0274
    - ns: mod
      id: MOD:00279
    - ns: go
      id: GO:0018386
    structure: SC[C@H]([NH2+][C@H](C(=O)[O-])C)C=O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0058:
    id: AA0058
    name: N-D-glucuronyl-glycine
    comments: The glucuronic acid is linked as an amide, rather than as a glycoside
      (see RESID:AA0291). The alpha glucuronoyl form is shown.
    synonyms:
    - 2-(glucuronoylamino)ethanoic acid
    - N-D-glucuronyl-glycine
    identifiers:
    - ns: mod
      id: MOD:00067
    - ns: cas
      id: 62532-50-7
    - ns: go
      id: GO:0018007
    - ns: resid
      id: AA0058
    structure: OC(=O)CNC(=O)[C@H]1O[C@@H](O)[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  C, H:
    id: AA0436
    name: 6-(S-L-cysteinyl)-8alpha-(-3'-L-histidino)-FAD
    comments: 'The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - 6-(S-cysteinyl)-8alpha-(N(delta1)-histidyl)-FAD
    - 6-(S-cysteinyl)-8alpha-(N3'-histidyl)-FAD
    - 6-(S-cysteinyl)-8alpha-(N(pi)-histidyl)-FAD
    - 6-((R)-2-amino-2-carboxyethyl)sulfanyl-8alpha-[4-((S)-2-amino-2-carboxyethyl)imidazol-3-yl]-riboflavin
      5'-(trihydrogen diphosphate) 5'->5'-ester with adenosine
    - 6-(S-cysteinyl)-8alpha-(pros-histidyl)-FAD
    identifiers:
    - ns: pdb.ligand
      id: FAD
    - ns: mod
      id: MOD:01182
    - ns: resid
      id: AA0436
    structure: O=C[C@H](CSC1=C(C)[C@@H](C=C2C1=N[C@H]1C(=O)NC(=O)N=C1N2C[C@@H]([C@@H]([C@@H](CO[P@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@@H]2N)[O-])[O-])O)O)O)Cn1cncc1C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - C
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 78
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 81
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 80
    - molecule: Monomer
      element: H
      position: 80
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 81
    - molecule: Monomer
      element: H
      position: 81
      charge: 1
  AA0075:
    id: AA0075
    name: N6,N6-dimethyl-L-lysine
    comments: 'This modification is readily formed artifactually by reductive methylation
      using formaldehyde. Generating Enzyme: histone-lysine N-methyltransferase (EC
      2.1.1.43); cytochrome-c-lysine N-methyltransferase (EC 2.1.1.59); calmodulin-lysine
      N-methyltransferase (EC 2.1.1.60).'
    synonyms:
    - n-dimethyl-lysine
    - (2S)-2-amino-6-dimethylamino-hexanoic acid
    - N~6~,N~6~-dimethyl-L-lysine
    - epsilon-dimethyllysine
    - lysine derivative Lys(y)
    - K
    - N(zeta)-dimethyllysine
    - (2S)-2-amino-6-(dimethylamino)hexanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:61969
    - ns: resid
      id: AA0075
    - ns: go
      id: GO:0018024
    - ns: cas
      id: 2259-86-1
    - ns: pdb.ligand
      id: MLY
    - ns: pdb-ccd
      id: MLY
    - ns: mod
      id: MOD:00084
    structure: C[NH+](CCCC[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  M, Y:
    id: AA0377
    name: 3-(2-methylthio)ethyl-6-(4-hydroxybenzylidene)-5-iminopiperazin-2-one
    comments: The correct structure for the asFP595 chromophore is now thought to
      be a para-hydroxybenzylidene-5-imidazolidinone. See RESID:AA0379. The diagram
      presents structures for two tautomeric forms with the glycine, which is linked
      by either an imino or amino group, shown in gray. In the correct structure,
      the glycine amino group forms part of a 5-member ring.
    synonyms:
    - 3-(2-methylthio)ethyl-6-(4-hydroxybenzylidene)-5-amino-3,6-didehydropyrazin-2-ol
    - GFP-like chromoprotein asFP595 chromophore
    - L-methionyl-L-tyrosyl-2-keto-5-iminopiperazine
    - 3-(2-methylsulfanyl)ethyl-6-(4-hydroxybenzylidene)-5-iminopiperazin-2-one
    identifiers:
    - ns: resid
      id: AA0377
    - ns: go
      id: GO:0051357
    - ns: mod
      id: MOD:00382
    structure: CSCC[C@@H]1N[C@@H](NCC(=O)O)/C(=C\c2ccc(cc2)O)/NC1=O
    base_monomers:
    - M
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0307:
    id: AA0307
    name: S-myristoyl-L-cysteine
    comments: 'The predominant palmitoyl transferase in mammalian systems appears
      to utilize a mixture of saturated and unsaturated fatty acids including myristoic
      acid. Some systems may be more specific in their incorporation of other fatty
      acids. See RESID:AA0106 and RESID:AA0308. Generating Enzyme: protein-cysteine
      S-myristoyltransferase (EC 2.3.1.-).'
    synonyms:
    - tetradecanoate cysteine thioester
    - (R)-2-amino-3-(tetradecanoylsulfanyl)propanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:22061
    - ns: pdb.ligand
      id: MYR
    - ns: mod
      id: MOD:00312
    - ns: resid
      id: AA0307
    - ns: go
      id: GO:0019704
    structure: CCCCCCCCCCCCCC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
  AA0591:
    id: AA0591
    name: N-palmitoyl-L-methionine
    comments: 'Generating Enzyme: methionylpeptide N-palmitoyltransferase (EC 2.3.1.-).'
    synonyms:
    - N-(1-oxohexadecyl)methionine
    - 2-(hexadecanamido)-4-(methylsulfanyl)butanoic acid
    - (2S)-2-(hexadecanoylamino)-4-(methylsulfanyl)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:01937
    - ns: cas
      id: 36416-81-6
    - ns: resid
      id: AA0591
    structure: CCCCCCCCCCCCCCCC(=O)N[C@H](C(=O)O)CCSC
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
  AA0098:
    id: AA0098
    name: L-tryptophan amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-amino-3-(1H-indol-3-yl)propanamide
    - tryptophanamide
    identifiers:
    - ns: mod
      id: MOD:00107
    - ns: cas
      id: 20696-57-5
    - ns: go
      id: GO:0018051
    - ns: resid
      id: AA0098
    - ns: chebi
      id: CHEBI:16533
    - ns: pdb.ligand
      id: NH2
    structure: NC(=O)[C@H](Cc1c[nH]c2c1cccc2)[NH3+]
    base_monomers:
    - W
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0190:
    id: AA0190
    name: D-aspartic acid
    comments: The stereoisomeric conversion of L-aspartic acid or L-asparagine to
      D-aspartic acid is probably mediated by the spontaneous cyclization and deamidation
      to a 2-aminosuccinimidyl group (see RESID:AA0441).
    synonyms:
    - (2R)-2-aminobutanedioic acid
    - aminosuccinic acid
    - 2-azanylbutanedioic acid
    identifiers:
    - ns: pdb.ligand
      id: DAS
    - ns: resid
      id: AA0190
    - ns: mod
      id: MOD:01921
    - ns: cas
      id: 1783-96-6
    - ns: chebi
      id: CHEBI:48094
    - ns: mod
      id: MOD:01930
    structure: O=C[C@@H](CC(=O)[O-])[NH3+]
    base_monomers:
    - N
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0193:
    id: AA0193
    name: D-methionine
    comments: 'Generating Enzyme: protein-methionine epimerase (EC 5.1.1.-).'
    synonyms:
    - 2-amino-4-(methylthio)butyric acid
    - (2R)-2-amino-4-(methylsulfanyl)butanoic acid
    - 2-amino-4-(methylthio)butanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:29984
    - ns: pdb.ligand
      id: MED
    - ns: resid
      id: AA0193
    - ns: go
      id: GO:0019123
    - ns: cas
      id: 348-67-4
    - ns: mod
      id: MOD:00200
    structure: CSCC[C@@H]([NH3+])C(=O)O
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  AA0354:
    id: AA0354
    name: N2-acetyl-L-arginine
    comments: 'The common peptide alpha-N-acetyltransferase does not acetylate basic
      residues, so another alpha-acetyltransferase activity must be producing this
      modification in a thylakoid protein. Generating Enzyme: arginylpeptide alpha-N-acetyltransferase
      (EC 2.3.1.-).'
    synonyms:
    - acetylarginine
    - 2-acetylamino-5-guanidinopentanoic acid
    - (S)-2-acetamido-5-carbamimidamidopentanoic acid
    - 2-acetamido-5-guanidinopentanoic acid
    - N(alpha)-acetylarginine
    - alpha-acetylamino-delta-guanidinovaleric acid
    identifiers:
    - ns: resid
      id: AA0354
    - ns: mod
      id: MOD:00359
    - ns: cas
      id: 155-84-0
    - ns: go
      id: GO:0048275
    structure: CC(=O)N[C@H](C(=O)O)CCC[NH+]=C(N)N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  C, C:
    id: AA0429
    name: 15,16-dihydrobiliverdin-bis-L-cysteine
    comments: This bilin transmits violet. The stereochemistry for the 18' chiral
      center has not been resolved.
    synonyms:
    - (16R)-8,12-bis(2-carboxyethyl)-3-[2-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-18-[(1Xi)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-2,7,13,17-tetramethyl-15,16-dihydrobilin-1,19(21H,24H)-dione
    - 3'',18'-biscysteinyl-15,16-dihydrobiliverdin
    - 15,16-dihydrobiliverdin cysteine adduct
    - 3beta,18alpha-biscysteinyl-15,16-dihydrobiliverdin
    - 8,12-bis(2-carboxyethyl)-3-(2-(cysteinyl-S)-ethyl)-18-(1-(cysteinyl-S)-ethyl)-2,7,13,17-tetramethylbiladiene-ab-1,19(16H,21H)-dione
    - DBV
    - 15,16-dihydrobiliverdin IXalpha
    - 15,16-Dhbv
    identifiers:
    - ns: cas
      id: 137429-14-2
    - ns: resid
      id: AA0429
    - ns: pdb.ligand
      id: DBV
    - ns: mod
      id: MOD:01143
    structure: O=C[C@H](CSCCC1=C(C)C(=O)N/C/1=C\c1[nH]c(c(c1C)CCC(=O)[O-])Cc1[nH]c(c(c1CCC(=O)[O-])C)C[C@H]1NC(=O)C(=C1C)[C@@H](SC[C@@H](C=O)[NH3+])C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  T, T:
    id: AA0572
    name: L-threonine 5-methyloxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-threonine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S,2R)-1-amino-2-hydroxypropyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    - 2-[(1S,2R)-1-azanyl-2-hydroxypropyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01901
    - ns: resid
      id: AA0572
    structure: C[C@H]([C@@H](c1oc(c(n1)C(=O)O)C)N)O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
  AA0388:
    id: AA0388
    name: 4-hydroxy-D-valine
    synonyms:
    - (2R,3Xi)-2-amino-4-hydroxy-3-methylbutanoic acid
    - D-gamma-hydroxyvaline
    identifiers:
    - ns: resid
      id: AA0388
    - ns: mod
      id: MOD:00756
    structure: OC[C@H]([C@H](C(=O)O)[NH3+])C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0278:
    id: AA0278
    name: N6-propylamino-poly(propylmethylamino)-propyldimethylamine-L-lysine
    comments: In silaffin from the diatom Cylindrotheca fusiformis there are five
      to eleven N-methyl-propylamine monomeric units on each lysine. Six are shown.
    synonyms:
    - lysine derivative Lys(x)
    - N6-[3-([(omega)-(dimethyl)aminopropyl-poly(3-[methylamino]propyl)]amino)propyl]lysine
    - (alpha)- ([([(5S)-5-amino-5-carboxypentyl]amino)propyl][(methyl)amino])-(omega)-methyl
      poly[propane-1,3-diyl(methylimino)]
    - silaffin polycationic lysine derivative
    identifiers:
    - ns: go
      id: GO:0018185
    - ns: mod
      id: MOD:00283
    - ns: resid
      id: AA0278
    structure: C[NH+](CCCNCCC[NH2+]CCCC[C@@H](C(=O)O)[NH3+])CCCN(CCC[NH+](CCCN(CCC[NH+](C)C)C)C)C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  AA0117:
    id: AA0117
    name: N6-biotinyl-L-lysine
    comments: 'Generating Enzyme: biotin--protein ligase (EC 6.3.4.-); biotin--[methylmalonyl-CoA-carboxyltransferase]
      ligase (EC 6.3.4.9); biotin--[propionyl-CoA-carboxylase (ATP-hydrolysing)] ligase
      (EC 6.3.4.10); biotin--[methylcrotonoyl-CoA-carboxylase] ligase (EC 6.3.4.11);
      biotin--[acetyl-CoA-carboxylase] ligase (EC 6.3.4.15).'
    synonyms:
    - N6-biotinyllysine
    - epsilon-N-biotinyllysine
    - (2S)-2-amino-6-(5-[(3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl]pentanoylamino)hexanoic
      acid
    - biocytin
    - (3aS-(3aalpha,4beta,6aalpha))-N6-(5-(hexahydro-2-oxo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)-L-lysine
    - N6-[5-((3aS,4S,6aR)-hexahydro-2-oxo-1H-thieno[3,4-d]imidazol-4-yl)-1-oxopentyl]-L-lysine
    identifiers:
    - ns: resid
      id: AA0117
    - ns: cas
      id: 576-19-2
    - ns: go
      id: GO:0018054
    - ns: mod
      id: MOD:00126
    - ns: pdb.ligand
      id: BTN
    structure: O=C(NCCCC[C@@H](C(=O)O)[NH3+])CCCC[C@@H]1SC[C@H]2[C@@H]1NC(=O)N2
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0576:
    id: AA0576
    name: N-formyl-L-alanine
    synonyms:
    - (2S)-2-(formylamino)propanoic acid
    - 2-formamidopropionic acid
    - 2-formamidopropanoic acid
    identifiers:
    - ns: cas
      id: 10512-86-4
    - ns: resid
      id: AA0576
    - ns: pdb.ligand
      id: FOR
    - ns: mod
      id: MOD:01915
    structure: O=CN[C@H](C(=O)O)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  AA0602:
    id: AA0602
    name: (2R)-2-hydroxyproline
    comments: 'The chemical stability of this modification has been questioned. However,
      a similar modification in an homologous enzyme has apparently been observed
      by another group in work that has not yet been published. Generating Enzyme:
      autocatalytic.'
    synonyms:
    - alpha-hydroxyproline
    - (2R)-2-oxidanylpyrrolidine-2-carboxylic acid
    - 2-hydroxy-L-proline
    - 2-hydroxy-l-proline
    - (2R)-2-hydroxypyrrolidine-2-carboxylic acid
    - 2-oxidanylpyrrolidine-2-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0602
    - ns: pdb-ccd
      id: PXU
    - ns: pdb.ligand
      id: PXU
    - ns: mod
      id: MOD:01957
    structure: OC(=O)[C@]1(O)CCC[NH2+]1
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  C, N:
    id: AA0469
    name: L-asparagine 5-methylthiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1,3-diamino-3-oxopropyl]-5-methyl-1,3-thiazole-4-carboxylic acid
    - 2-[(1S)-1,3-bisazanyl-3-oxopropyl]-5-methyl-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01392
    - ns: resid
      id: AA0469
    structure: NC(=O)C[C@@H](c1nc(c(s1)C)C(=O)O)N
    base_monomers:
    - N
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
  AA0308:
    id: AA0308
    name: S-palmitoleyl-L-cysteine
    comments: 'This specific modification has been detected but not located by sequencing
      in proteins. This modification may also arise from non-specific activity of
      the enzymes that produce S-palmitoyl-L-cysteine; see RESID:AA0106. Generating
      Enzyme: protein-cysteine S-palmitoleyltransferase (EC 2.3.1.-).'
    synonyms:
    - cis-9-hexadecenoate cysteine thioester
    - (R)-2-amino-3-((Z)-9-hexadecenoylsulfanyl)propanoic acid
    identifiers:
    - ns: mod
      id: MOD:00313
    - ns: go
      id: GO:0019939
    - ns: resid
      id: AA0308
    structure: CCCCCC/C=C\CCCCCCCC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
  AA0176:
    id: AA0176
    name: L-4'-bromophenylalanine
    synonyms:
    - 4-bromo-l-phenylalanine
    - p-bromophenylalanine
    - 4-bromo-L-phenylalanine
    - (2S)-2-amino-3-(4-bromophenyl)propanoic acid
    - para-bromophenylalanine
    - Y
    identifiers:
    - ns: pdb.ligand
      id: 4BF
    - ns: mod
      id: MOD:00185
    - ns: resid
      id: AA0176
    - ns: cas
      id: 24250-84-8
    - ns: go
      id: GO:0018075
    - ns: pdb-ccd
      id: 4BF
    structure: '[NH3+][C@H](C(=O)O)Cc1ccc(cc1)Br'
    base_monomers:
    - F
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  A, G:
    id: AA0187
    name: L-alanine 5-imidazolinone glycine
    comments: This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, an alanine, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N+1 which loses one hydrogen, and the loss of
      a molecule of water. This cross-link is accompanied by modification of residue
      N+1. The modified residue N+1 is presented in a separate entry and is not included
      in the mass accounting of this entry. The backbone atoms of residue N+1 are
      shown in gray in the diagram.
    synonyms:
    - 4-methylidene-imidazole-5-one active site
    - alanyl-5-imidazolinone glycine
    - 2-[1-aminoethyl]-1-carboxymethyl-1-imidazolin-5-one
    - (2-[(1S)-1-aminoethyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic acid
    - para-hydroxybenzylidene-imidazolidinone chromophore
    identifiers:
    - ns: mod
      id: MOD:00195
    - ns: pdb.ligand
      id: AYG
    - ns: resid
      id: AA0187
    - ns: go
      id: GO:0018253
    structure: OC(=O)CN1C(=O)CN=C1[C@@H]([NH3+])C
    base_monomers:
    - A
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0479:
    id: AA0479
    name: (2S,3R,4R)-3,4-dihydroxyproline
    synonyms:
    - 2-alpha-3-beta-4-alpha-3,4-dihydroxyproline
    - (2S,3R,4R)-3,4-dihydroxypyrrolidine-2-carboxylic acid
    - 2,3-trans-3,4-trans-3,4-dihydroxy-L-proline
    identifiers:
    - ns: resid
      id: AA0479
    - ns: cas
      id: 74644-88-5
    - ns: mod
      id: MOD:01402
    structure: O[C@@H]1C[NH2+][C@@H]([C@H]1O)C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0129:
    id: AA0129
    name: 2-oxobutanoic acid
    synonyms:
    - 2-ketobutyric acid
    - 2-oxobutanoic acid
    - 2-oxobutyric acid
    identifiers:
    - ns: chebi
      id: CHEBI:30831
    - ns: pdb.ligand
      id: 2KT
    - ns: cas
      id: 600-18-0
    - ns: resid
      id: AA0129
    - ns: go
      id: GO:0018058
    - ns: mod
      id: MOD:00138
    structure: CCC(=O)C(=O)O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
  AA0487:
    id: AA0487
    name: 4-hydroxy-L-glutamic acid
    comments: This modification is currently represented in the PDB as part of the
      HET group for the entire molecule of nosiheptide. The chirality of C-4 is not
      settled. The (2S,4S) diastereomer is shown.
    synonyms:
    - (2S,4Xi)-2-amino-4-hydroxypentanedioic acid
    - gamma-hydroxy glutaminic acid
    - (2s,4s)-2-amino-4-hydroxy-pentanedioic acid
    - threo-4-hydroxy-L-glutamic acid
    - (2S,4S)-2-amino-4-hydroxy-pentanedioic acid
    - (2S,4S)-2-amino-4-hydroxypentanedioic acid (non-preferred name)
    identifiers:
    - ns: cas
      id: 3913-68-6
    - ns: pdb-ccd
      id: 3GL
    - ns: mod
      id: MOD:01434
    - ns: resid
      id: AA0487
    - ns: pdb.ligand
      id: 3GL
    structure: O=C[C@H](C[C@@H](C(=O)[O-])O)[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0104:
    id: AA0104
    name: S-geranylgeranyl-L-cysteine
    comments: 'For the type I geranylgeranyltransferase the residue may be found at
      the first position in the sequence motif CXX[LF]* where the second and third
      positions are usually aliphatic. For the type II geranylgeranyltransferase the
      residue may be found at the first and final positions in the sequence motif
      CXC* or at the final two positions in the sequence motif CC*. These motifs are
      necessary but not sufficient for modification. Formation of S-geranylgeranylcysteine
      may be coupled with subsequent cleavage of a carboxy-terminal tripeptide for
      the CAAX motif and methyl esterification of the geranylgeranylated cysteine.
      Methyl esterification without cleavage occurs for the CXC motif. Generating
      Enzyme: protein-cysteine geranylgeranyltransferase (EC 2.5.1.-).'
    synonyms:
    - (2R)-2-amino-3-([(2E,6E,10Z)-12-hydroxy-3,7,11-trimethyldodeca-2,6,10-trien-1-yl]sulfanyl)propanoic
      acid
    - 2-amino-3-(3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraenylthio)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018228
    - ns: cas
      id: 131404-69-8
    - ns: pdb.ligand
      id: GER
    - ns: resid
      id: AA0104
    - ns: mod
      id: MOD:00113
    structure: C/C(=C\CC/C(=C/CSC[C@@H](C(=O)O)[NH3+])/C)/CC/C=C(/CCC=C(C)C)\C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0258:
    id: AA0258
    name: S-phycobiliviolin-L-cysteine
    comments: The phycoviolobilins transmit violet. It has not been established whether
      the chromophores that have been referred to as cryptoviolins have the same structure
      as phycoviolobilin.
    synonyms:
    - (4S)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-18-ethyl-4,5-dihydro-2,7,13,17-tetramethyl-(21H,22H,24H)-biladiene-bc-1,19-dione
    - PVB
    - PBV
    - S-phycobiliviolin-L-cysteine
    - cryptoviolin
    - cryptoviolobilin
    - PXB
    - cryptobiliviolin
    identifiers:
    - ns: pdb.ligand
      id: PVN
    - ns: go
      id: GO:0017008
    - ns: mod
      id: MOD:00263
    - ns: resid
      id: AA0258
    - ns: cas
      id: 124861-40-1
    structure: O=C[C@H](CS[C@@H](C1=C(C)C(=O)N[C@H]1Cc1[nH]c(c(c1C)CCC(=O)[O-])Cc1[nH]c(c(c1CCC(=O)[O-])C)/C=C\1/NC(=O)C(=C1C)CC)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  O:
    id: AA0321
    name: N6-(4-methyl-delta-1-pyrroline-5-carboxyl)-L-lysine
    comments: 'Pyrrolysine is encoded by the UAG codon in some genetic systems. Although
      the single letter symbol O is recommended by IUBMB, most software applications
      fail to recognize it, and many sequence databases use the single letter symbol
      K. Proposed enzyme names are presented. There is evidence for the third reaction
      with an ornithine substrate, but not yet for the 3-methylornithine substrate,
      and the redox cofactor has not been identified. Generating Enzyme: lysine--tRNA(Pyl)
      ligase (EC 6.1.1.25); pyrrolysine--tRNA(Pyl) ligase (EC 6.1.1.26); (3R)-3methyl-D-ornithine
      carboxy-aminomethylmutase, PylB (EC 5.4.99.-); (3R)-3-methyl-D-ornithine--L-lysine
      ligase, PylC (EC 6.3.2.-); N6-[(3R)-3-methyl-D-ornithinyl]-L-lysine N5-ornithine
      dehydrogenase, PylD (EC 1.4.1.-).'
    synonyms:
    - N6-([(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrol-2-yl]carbonyl)-L-lysine
    - monomethylamine methyltransferase cofactor lysine adduct
    - N6-(4-methyl-delta-1-pyrroline-5-carboxyl)-L-lysine
    - N6-(4-methyl-1,2-didehydropyrrolidine-5-carboxyl)-L-lysine
    - (2S)-2-amino-6-[(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrol-2-ylcarbonyl]aminohexanoic
      acid
    - 2-azanyl-6-[(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrol-2-ylcarbonyl]azanylhexanoic
      acid
    identifiers:
    - ns: resid
      id: AA0321
    - ns: mod
      id: MOD:00326
    - ns: go
      id: GO:0030631
    - ns: pdb.ligand
      id: BGX
    - ns: cas
      id: 448235-52-7
    - ns: mod
      id: MOD:01187
    - ns: chebi
      id: CHEBI:21860
    structure: OC(=O)[C@H](CCCCNC(=O)[C@@H]1[NH2+]CC[C@H]1C)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  I, S:
    id: AA0573
    name: L-isoleucine oxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-serine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S,2S)-1-azanyl-2-methylbutyl]-1,3-oxazole-4-carboxylic acid
    - 2-[(1S,2S)-1-amino-2-methylbutyl]-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0573
    - ns: mod
      id: MOD:01902
    structure: C[C@H]([C@H]([NH3+])c1nc(co1)C(=O)O)CC
    base_monomers:
    - I
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
  C, T:
    id: AA0485
    name: L-threonine thiazoline-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue. The ring may be oxidized to thiazole and then reduced
      from the opposite side effectively inverting the cysteine alpha-carbon chirality.
      Generating Enzyme: peptidyl-cysteine cyclase (EC 4.2.1.-).'
    synonyms:
    - (4S)-2-[(1S,2R)-1-amino-2-hydroxypropyl]-4,5-dihydro-1,3-thiazole-4-carboxylic
      acid
    - 2-[1-azanyl-2-hydroxypropyl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01408
    - ns: pdb.ligand
      id: BB9
    - ns: resid
      id: AA0485
    structure: C[C@H]([C@@H]([C@H]1SC[C@H](N1)C(=O)O)[NH3+])O
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0497:
    id: AA0497
    name: O-(2-aminoethylphosphoryl)-L-serine
    synonyms:
    - serine ethanolamine phosphate
    - O3-(phosphoethanolamine)-L-serine
    - O3-(2-aminoethylphosphoryl)-L-serine
    - serine ethanolamine phosphodiester
    - (2S)-2-amino-3-([(2-aminoethoxy)(hydroxy)phosphoryl]oxy)propanoic acid
    identifiers:
    - ns: pdb.ligand
      id: OPE
    - ns: resid
      id: AA0497
    - ns: cas
      id: 1186-34-1
    - ns: mod
      id: MOD:01587
    structure: '[O-]P(=O)(OCC[NH3+])OC[C@H]([NH3+])C(=O)O'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0099:
    id: AA0099
    name: L-tyrosine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-amino-3-(4-hydoxyphenyl)propanamide
    - tyrosinamide
    identifiers:
    - ns: mod
      id: MOD:00108
    - ns: resid
      id: AA0099
    - ns: cas
      id: 4985-46-0
    - ns: chebi
      id: CHEBI:21412
    - ns: go
      id: GO:0018052
    - ns: pdb.ligand
      id: NH2
    structure: '[NH3+][C@H](C(=O)N)Cc1ccc(cc1)O'
    base_monomers:
    - Y
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  G, S:
    id: AA0184
    name: L-serine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a serine, to the alpha-amino nitrogen of
      residue N+2, a glycine, coupled with the formation of a double bond to the alpha-amino
      nitrogen of residue N+1 which loses one hydrogen, and the loss of a molecule
      of water. This cross-link is accompanied by modification of residue N+1. The
      modified residue N+1 is presented in a separate entry and is not included in
      the mass accounting of this entry. The backbone atoms of residue N+1 are shown
      in gray in the diagram. The chirality of residue N is (R) rather then (S) because
      of the reversed order of precedence with respect to the beta-carbon methoxy
      group of the 5-imidazolinone group replacing the carboxyl group. The modification
      of serine to dehydroalanine coupled with the formation of 5-imidazolinone by
      the two neighboring residues produces the 4-methylidene-imidazole-5-one (MIO)
      active site of some amino acid ammonia-lyases that differs by UV and mass spectrometric
      evidence from other known dehydroalanine containing peptides not containing
      the second modification. Generating Enzyme: autocatalytic.'
    synonyms:
    - '[(4z)-2-(1-amino-2-hydroxyethyl)-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    - seryl-5-imidazolinone glycine
    - '[(4Z)-2-[(1R)-1-amino-2-hydroxyethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - green fluorescent protein chromophore
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-[(4Z)-2-[(1R)-1-azanyl-2-oxidanyl-ethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - 4-methylidene-imidazole-5-one (MIO) active site
    - 2-[1-amino-2-hydroxyethyl]-1-carboxymethyl-1-imidazolin-5-one
    - (2-[(1R)-1-amino-2-hydroxyethyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic acid
    - SYG
    identifiers:
    - ns: pdb.ligand
      id: GYS
    - ns: resid
      id: AA0184
    - ns: mod
      id: MOD:00192
    - ns: go
      id: GO:0018252
    - ns: pdb-ccd
      id: GYS
    structure: OC[C@@H](C1=NCC(=O)N1CC(=O)O)[NH3+]
    base_monomers:
    - S
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
  C, E:
    id: AA0488
    name: 2-(cystein-S-ylcarbonyl)-3-methyl-4-(glutam-5-yloxy)methylindole
    comments: This modification is currently represented in the PDB as part of the
      HET group for the entire molecule of nosiheptide.
    synonyms:
    - 2-([(1R)-1-amino-1-carboxyeth-2-yl]sulfanyl)carbonyl-3-methyl-4-([(1S)-1-amino-1-carboxy-4-oxobutan-4-yl]oxy)methyl-1H-indole
    - 2-(cystein-S-ylcarbonyl)-4-[(glutam-5-yloxy)methyl]-3-methyl-1H-indole
    identifiers:
    - ns: pdb.ligand
      id: NO1
    - ns: mod
      id: MOD:01435
    - ns: resid
      id: AA0488
    structure: O=C[C@H](CCC(=O)OCc1cccc2c1c(C)c([nH]2)C(=O)SC[C@@H](C(=O)O)N)[NH3+]
    base_monomers:
    - E
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
    - molecule: Monomer
      element: H
      position: 30
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
  AA0409:
    id: AA0409
    name: L-2-aminobutanoic acid
    comments: 'Exposure of green fluorescent protein to 254 nm UV light or to 390
      nm visible light causes gamma decarboxylation of glutamic acid 222. Unlike the
      threonine in 3-methylanthionine, the L configuration (S chirality) of the 2-aminobutanoate
      skeleton is maintained. Generating Enzyme: autocatalytic.'
    synonyms:
    - (S)-2-aminobutanoic acid
    - L-alpha-amino-n-butyric acid
    - L-alpha-aminobutyric acid
    - L-2-amino-n-butyric acid
    - L-butyrine
    - L-2-aminobutyric acid
    identifiers:
    - ns: chebi
      id: CHEBI:35619
    - ns: cas
      id: 1492-24-6
    - ns: pdb.ligand
      id: ABA
    - ns: mod
      id: MOD:00819
    - ns: resid
      id: AA0409
    structure: CC[C@H]([NH3+])C(=O)O
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0180:
    id: AA0180
    name: 6'-chloro-L-tryptophan
    synonyms:
    - W
    - 6-chloro-L-tryptophan
    - (2S)-2-amino-3-(6-chloro-1H-indol-3-yl)propanoic acid
    - 6-chloro-l-tryptophan
    identifiers:
    - ns: cas
      id: 17808-35-4
    - ns: pdb.ligand
      id: 6CW
    - ns: mod
      id: MOD:00886
    - ns: pdb-ccd
      id: 6CW
    - ns: resid
      id: AA0180
    structure: OC(=O)[C@H](Cc1c[nH]c2c1ccc(c2)Cl)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0045:
    id: AA0045
    name: N-acetyl-L-glutamine
    comments: The occurrence of this modification has not been confirmed. Formerly,
      its annotation in sequence databases was due to either the misidentification
      of 2-pyrrolidone-5-carboxylic acid, or inappropriate homolog comparisons when
      proteolytic modification was more probable.
    synonyms:
    - 2-acetylamino-5-pentanediamic acid
    - 2-acetylamino-5-amino-5-oxopentanoic acid
    - (2S)-2-acetamido-5-pentanediamic acid
    - acetylglutamine
    - 2-acetylazanyl-5-azanyl-5-oxopentanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:21553
    - ns: resid
      id: AA0045
    - ns: cas
      id: 2490-97-3
    - ns: go
      id: GO:0017192
    - ns: mod
      id: MOD:00054
    structure: NC(=O)CC[C@@H](C(=O)O)NC(=O)C
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0448:
    id: AA0448
    name: (3R,4S)-4-hydroxyisoleucine
    comments: In peptide sequencing work prior to 1968, this modification was reported
      as a beta-methylleucine derivative that could arise by either beta-methylation
      of leucine or gamma-methylation of isoleucine. The correct structure has been
      determined to be derived from isoleucine without methylation.
    synonyms:
    - gamma-hydroxyisoleucine
    - (2S,3R,4S)-2-amino-3-methyl-4-hydroxyvaleric acid
    - (3R,4S)-4-hydroxyisoleucine
    - (2S,3R,4S)-2-amino-4-hydroxy-3-methylpentanoic acid
    identifiers:
    - ns: resid
      id: AA0448
    - ns: mod
      id: MOD:01377
    structure: C[C@@H]([C@@H]([C@@H](C(=O)O)[NH3+])C)O
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0174:
    id: AA0174
    name: L-2'-bromophenylalanine
    synonyms:
    - (S)-2-amino-3-(2-bromophenyl)propanoic acid
    - ortho-bromophenylalanine
    - o-bromophenylalanine
    identifiers:
    - ns: cas
      id: 42538-40-9
    - ns: mod
      id: MOD:00183
    - ns: resid
      id: AA0174
    - ns: go
      id: GO:0018075
    structure: OC(=O)[C@H](Cc1ccccc1Br)[NH3+]
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0147:
    id: AA0147
    name: L-2',4',5'-topaquinone
    synonyms:
    - 2,4,5-trihydroxyphenylalanine quinone
    - (2S)-2-amino-3-(4-hydroxy-3,6-dioxo-1-cyclohexa-1,4-dienyl)propanoic acid
    - 5-(2-carboxy-2-aminoethyl)-2-hydroxy-1,4-benzoquinone
    - TPQ
    - (2S)-2-amino-3-(5-hydroxy-2,5-cyclohexadien-1,4-dion-2-yl)propanoic acid
    - Y
    - L-2,4,5-TOPAquinone
    - 3-(4-hydroxy-3,6-dioxocyclohexa-1,4-dien-1-yl)-L-alanine
    identifiers:
    - ns: pdb.ligand
      id: TPQ
    - ns: resid
      id: AA0147
    - ns: chebi
      id: CHEBI:21187
    - ns: pdb-ccd
      id: TPQ
    - ns: go
      id: GO:0018068
    - ns: mod
      id: MOD:00156
    structure: '[O-]C1=CC(=O)C(=CC1=O)C[C@H]([NH3+])C(=O)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0534:
    id: AA0534
    name: N,N-dimethyl-L-serine
    comments: 'For alpha-aino acids, both N-alpha-monomethylation, and N-alpha protonation
      and complete trimethylation have been observed, but incomplete dimethylation
      has not been reported as the end result of a natural process. Generating Enzyme:
      N-terminal RCC1 methyltransferase (EC 2.1.1.-).'
    synonyms:
    - (2S)-2-(dimethylamino)propanoic acid
    - N,N-dimethylserine
    identifiers:
    - ns: mod
      id: MOD:01783
    - ns: go
      id: GO:0035570
    - ns: resid
      id: AA0534
    structure: OC[C@@H](C(=O)O)N(C)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
  AA0384:
    id: AA0384
    name: N-formyl-L-proline
    synonyms:
    - 1-formyl-2-pyrrolidinecarboxylic acid
    - 1-formylproline
    - (2S)-1-formylpyrrolidine-2-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:00389
    - ns: resid
      id: AA0384
    - ns: go
      id: GO:0051364
    - ns: cas
      id: 13200-83-4
    structure: O=CN1CCC[C@H]1C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
  C, P:
    id: AA0551
    name: L-proline 5-hydroxy-oxazole-4-carbothionic acid
    comments: The amino group of the following amino acid forms a thiopeptide bond.
      The amino(sulfanyl)methylidene tautomeric form is shown in the diagram and model.
      The biosynthesis of this modification from the encoded cysteine peptide has
      not been elaborated.
    synonyms:
    - 5-hydroxy-2-[(2S)-pyrrolidin-2-yl]-1,3-oxazole-4-carbothioic O-acid
    - (4Z)-4-[hydroxy(sulfanyl)methylidene]-2-[(2S)-pyrrolidin-2-yl]-1,3-oxazol-5(4H)-one
      [tautomer]
    identifiers:
    - ns: resid
      id: AA0551
    - ns: mod
      id: MOD:01845
    - ns: pdb.ligand
      id: 66G
    structure: '[S-]/C=C/1\N=C(OC1=O)[C@@H]1CCC[NH2+]1'
    base_monomers:
    - P
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
  AA0327:
    id: AA0327
    name: omega-N-glucosyl-L-arginine
    comments: 'Although proposed as the origin for plant starch, the anomeric isomer
      was beta, rather than alpha, and only a monosaccharide was observed. Generating
      Enzyme: amylogenin glucosyltransferase (EC 2.4.1.-).'
    synonyms:
    - omega-N-glycosyl-L-arginine
    - omega-N-(beta-D-glucosyl)-L-arginine
    - (2S)-2-amino-5-(beta-D-glucopyranosyl[imino(methylamino)methyl]amino)pentanoic
      acid
    - NG-beta-D-glucosylarginine
    identifiers:
    - ns: go
      id: GO:0042543
    - ns: mod
      id: MOD:00332
    - ns: resid
      id: AA0327
    structure: OC[C@H]1O[C@@H](N/C(=[NH+]\CCC[C@@H](C(=O)O)[NH3+])/N)[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0201:
    id: AA0201
    name: L-isoglutamyl-polyglycine
    comments: 'Generating Enzyme: glycine:protein-glutamate gamma-ligase (ADP-forming)
      (EC 6.3.2.-); glycine:protein-glutamyl(gamma-polyglycine) N-ligase (ADP-forming)
      (EC 6.3.2.-).'
    synonyms:
    - gamma-glutamylpolyglycineCross-references
    - '21343'
    - ChEBI
    identifiers:
    - ns: go
      id: GO:0018094
    - ns: mod
      id: MOD:00206
    - ns: chebi
      id: CHEBI:21343
    - ns: resid
      id: AA0201
    structure: O=C[C@H](CCC(=O)NCC(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0105:
    id: AA0105
    name: L-cysteine methyl ester
    comments: 'The term "carboxyl methylation" applies to this modification. The terms
      "carboxy methylation" and "carboxymethylation" are sometimes used incorrectly
      for this modification. Since those terms mean "replacement by a methylcarboxylic
      acid", they actually refer to a different, artifactual modification. Generating
      Enzyme: protein-S-isoprenylcysteine O-methyltransferase (EC 2.1.1.100).'
    synonyms:
    - mecysteine
    - methyl (2R)-2-amino-3-sulfanyl-propanoate
    - 2-amino-3-mercaptopropanoic methyl ester
    - C
    - 2-amino-3-sulfanylpropanoic methyl ester
    - methyl L-cysteinate
    - methyl (2R)-2-amino-3-sulfanylpropanoate
    - o-methylcysteine
    identifiers:
    - ns: chebi
      id: CHEBI:61989
    - ns: cas
      id: 2485-63-3
    - ns: mod
      id: MOD:00114
    - ns: resid
      id: AA0105
    - ns: pdb-ccd
      id: CMT
    - ns: go
      id: GO:0018229
    - ns: pdb.ligand
      id: CMT
    structure: COC(=O)[C@H](CS)N
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0349:
    id: AA0349
    name: O3-(riboflavin phosphoryl)-L-threonine
    synonyms:
    - (2S,3R)-2-amino-3-(riboflavin 5'-hydrogen phosphonoxy)butanoic acid
    - O3-threonyl FMN
    - O3-threonyl flavin mononucleotide
    identifiers:
    - ns: resid
      id: AA0349
    - ns: go
      id: GO:0050740
    - ns: mod
      id: MOD:00354
    structure: O=c1[nH]c(=O)c2c([nH]1)n(C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(O[C@@H]([C@@H](C(=O)O)[NH3+])C)[O-])O)O)O)c1=C[C@H](C(=Cc1n2)C)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
    - molecule: Monomer
      element: H
      position: 30
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  AA0511:
    id: AA0511
    name: glycyl phospho-5'-adenosine
    synonyms:
    - (2-aminoacetyl)oxy-([(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy)phosphinic
      acid
    - ([(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl)-2-aminoethanoate
    - glycyl 5'-adenylate
    - glycyl adenosine-5'-phosphate
    - aminoacetyl [5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl
      hydrogen phosphate
    - glycyladenylate
    - 5'-adenylic-glyinate
    - glycine monoanhydride with 5'-adenylic acid
    identifiers:
    - ns: pdb.ligand
      id: AMP
    - ns: mod
      id: MOD:01614
    - ns: resid
      id: AA0511
    - ns: cas
      id: 35985-26-3
    structure: NCC(=O)O[P@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  D, G:
    id: AA0410
    name: 2-imino-alanine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, an aspartic acid, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N, the loss of a molecule of water, and the
      beta-decarboxylation of the aspartic acid. This cross-link is accompanied by
      modification of residue N+1. The modified residue N+1 is presented in a separate
      entry and is not included in the mass accounting of this entry. The backbone
      atoms of residue N+1 are shown in gray in the diagram. Generating Enzyme: autocatalytic.'
    synonyms:
    - 2-[(4Z)-2-ethanimidoyl-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - '{(4Z)-2-[(1E)-ethanimidoyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - 2,N-didehydroalanyl-5-imidazolinone glycine
    - '[2-(1-iminoethyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid'
    - 2-(1-iminoethyl)-1-carboxymethyl-1-imidazolin-5-one
    - red fluorescent protein zRFP574 chromophore
    - (2-ethanimidoyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic acid
    - DYG
    - alanyl-5-imidazolinone glycine
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-imino-alanyl-5-imidazolinone glycine
    - '[(4z)-2-[(1z)-ethanimidoyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb.ligand
      id: XYG
    - ns: mod
      id: MOD:00820
    - ns: resid
      id: AA0410
    - ns: pdb-ccd
      id: XYG
    structure: OC(=O)CN1C(=O)CN=C1C(=N)C
    base_monomers:
    - D
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0517:
    id: AA0517
    name: N-(12-oxomyristoyl)-L-cysteine
    synonyms:
    - 2-(12-oxotetradecanoyl)amino-3-sulfanylpropanoic acid
    - N-(12-oxotetradecanoyl)cysteine
    identifiers:
    - ns: resid
      id: AA0517
    - ns: mod
      id: MOD:01691
    structure: CCC(=O)CCCCCCCCCCC(=O)N[C@H](C(=O)O)CS
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0157:
    id: AA0157
    name: O4'-glycosyl-L-tyrosine
    comments: 'The carbohydrate is glucose, the origin for glycogen. One to eleven
      alpha-1,4-linked glucose units may be auto-catalytically attached. See also
      RESID:AA0577 for other O-glycosylated tyrosines. Generating Enzyme: glycogenin
      glucosyltransferase (EC 2.4.1.186).'
    synonyms:
    - (2S)-2-amino-3-(4-alpha-D-glucopyranosyloxy)phenylpropanoic acid
    - O4'-glycosyl-L-tyrosine
    identifiers:
    - ns: go
      id: GO:0006493
    - ns: mod
      id: MOD:00166
    - ns: resid
      id: AA0157
    structure: OC[C@H]1O[C@H](Oc2ccc(cc2)C[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0302:
    id: AA0302
    name: L-aspartimide
    comments: This modification is autocatalytically produced from the carboxyl-terminal
      asparagine of spliced inteins. This modification is produced by the MccB enzyme
      as an intermediate in the process of biosynthesizing (3-aminopropyl)(L-aspartyl-1-amino)phosphoryl-5'-adenosine.
      See RESID:AA0328.
    synonyms:
    - ASI
    - 2-amino-butanimide
    - (3S)-3-amino-2,5-pyrrolidinedione
    - L-3-aminosuccinimide [misnomer]
    - N
    - L-2-aminosuccinimide
    - l-3-aminosuccinimide
    - (3S)-3-aminopyrrolidine-2,5-dione
    - L-asparaginimide
    - alpha-aminosuccinimide
    identifiers:
    - ns: cas
      id: 5615-80-5
    - ns: pdb-ccd
      id: SNN
    - ns: mod
      id: MOD:00307
    - ns: resid
      id: AA0302
    - ns: pdb.ligand
      id: SNN
    - ns: go
      id: GO:0019801
    structure: O=C1C[C@@H](C(=O)N1)N
    base_monomers:
    - N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0580:
    id: AA0580
    name: 3-hydroxy-L-histidine
    comments: 'This modified histidine has been found in an ankyrin repeat domain
      in a position occupied by asparagine in homologous sequences. The diastereomeric
      form has not been determined. Generating Enzyme: peptide-histidine beta-dioxygenase
      (EC 1.14.11.-).'
    synonyms:
    - (2S)-2-amino-3-hydroxy-3-(1H-imidazol-4-yl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0580
    - ns: mod
      id: MOD:01920
    structure: N[C@H](C(=O)O)[C@H](c1c[nH]cn1)O
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0481:
    id: AA0481
    name: L-asparagine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[1,3-bisazanyl-3-oxopropyl]-1,3-thiazole-4-carboxylic acid
    - 2-[(1S)-1,3-diamino-3-oxopropyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0481
    - ns: mod
      id: MOD:01404
    structure: NC(=O)C[C@@H](c1scc(n1)C(=O)O)N
    base_monomers:
    - N
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
  AA0060:
    id: AA0060
    name: N-palmitoyl-L-cysteine
    comments: 'In bacteria, the enzyme producing this modification may use a mixture
      of saturated and unsaturated fatty acids and act in close association with the
      enzyme producing S-diacylglycerol-L-cysteine (see RESID:AA0107). The signal
      peptide that is cleaved immediately before the modified cysteine typically ends
      in the motif [ILMV]X[AGS]C. In eukaryotes, the enzyme acts in the absence of
      modification of the cysteine thiol and may proceed after initial S-acylation
      (see RESID:AA0106) through a cyclic intermediate to the final N-acyl form. The
      eukaryotic enzyme appears to act more efficiently following formation of a carboxyl-terminal
      cholesterol ester (see RESID:AA0309). This modification should not be confused
      with S-palmitoyl-cysteine (see RESID:AA0106). Generating Enzyme: protein-cysteine
      N-palmitoyltransferase (EC 2.3.1.-).'
    synonyms:
    - N-(1-oxahexadecyl)-L-cysteine
    - 2-hexadecanoylamino-3-mercaptopropanoic acid
    - 2-hexadecanamido-3-sulfanylpropanoic acid
    - (2R)-2-hexadecanoylamino-3-sulfanylpropanoic acid
    identifiers:
    - ns: cas
      id: 67603-49-0
    - ns: mod
      id: MOD:00069
    - ns: resid
      id: AA0060
    - ns: go
      id: GO:0018009
    structure: CCCCCCCCCCCCCCCC(=O)N[C@H](C(=O)O)CS
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
  AA0212:
    id: AA0212
    name: O4-arabinosyl-L-hydroxyproline
    comments: 'See also RESID:AA0389 and RESID:AA0390 for other O4-glycosylated 4-hydroxyprolines.
      Generating Enzyme: [protein]-hydroxyproline O-arabinosyltransferase (EC 2.4.1.-).'
    synonyms:
    - beta-arabinofuranosyl-4-hydroxyproline
    - (2S,4R)-4-(beta-L-arabinofuranosyloxy)pyrrolidine-2-carboxylic acid
    - 4-(beta-L-arabinofuranosyloxy)proline
    - O4-glycosyl-hydroxyproline
    identifiers:
    - ns: go
      id: GO:0006493
    - ns: mod
      id: MOD:00217
    - ns: resid
      id: AA0212
    structure: OC[C@@H]1O[C@H]([C@@H]([C@H]1O)O)O[C@H]1C[NH2+][C@@H](C1)C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
    - molecule: Monomer
      element: H
      position: 26
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0482:
    id: AA0482
    name: L-proline thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(2S)-pyrrolidin-2-yl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0482
    - ns: mod
      id: MOD:01405
    structure: OC(=O)c1csc(n1)[C@@H]1CCC[NH2+]1
    base_monomers:
    - P
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0306:
    id: AA0306
    name: L-cysteine coenzyme A disulfide
    synonyms:
    - coenzyme A L-cysteine mixed disulfide
    - (2R)-2-amino-3-(2-((3-(((2R)-2,4-dihydroxy-3,3-dimethyl-1-oxobutyl)amino)-1-oxopropyl)amino)ethyl)dithio-propanoic
      acid 4'-ester with adenosine 5'-(trihydrogen diphosphate) 3'-(dihydrogen phosphate)
    identifiers:
    - ns: go
      id: GO:0019703
    - ns: resid
      id: AA0306
    - ns: mod
      id: MOD:00311
    structure: O=C(NCCSSC[C@@H](C(=O)O)[NH3+])CCNC(=O)[C@@H](C(COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1OP(=O)([O-])[O-])O)n1cnc2c1ncnc2N)[O-])[O-])(C)C)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0309:
    id: AA0309
    name: glycine cholesterol ester
    comments: This modification occurs at the carboxyl end released during autolytic
      cleavage.
    synonyms:
    - hedgehog lipophilic adduct
    - cholesteryl glycinate
    - glycine cholest-5-en-3beta-ol ester
    identifiers:
    - ns: go
      id: GO:0019708
    - ns: mod
      id: MOD:00314
    - ns: resid
      id: AA0309
    - ns: cas
      id: 57-88-5
    structure: NCC(=O)O[C@H]1CC[C@]2(C(=CC[C@@H]3[C@@H]2CC[C@]2([C@H]3CC[C@@H]2[C@@H](CCCC(C)C)C)C)C1)C
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0079:
    id: AA0079
    name: O-palmitoyl-L-threonine
    comments: The palmitate represents a mixture of saturated and unsaturated fatty
      acids.
    synonyms:
    - O3-palmitoyl-threonine
    - (2S,3R)-2-amino-3-(hexadecanoyloxy)butanoic acid
    - L-threonine hexadecanoate ester
    - threonine palmitate ester
    identifiers:
    - ns: mod
      id: MOD:00088
    - ns: cas
      id: 88467-30-5
    - ns: resid
      id: AA0079
    - ns: go
      id: GO:0018220
    structure: CCCCCCCCCCCCCCCC(=O)O[C@@H]([C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
    - molecule: Monomer
      element: H
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  AA0155:
    id: AA0155
    name: O-(N-acetylaminogalactosyl)-L-threonine
    comments: 'See also RESID:AA0247, RESID:AA0399, RESID:AA0401, RESID:AA0403, RESID:AA0405,
      and RESID:AA0515 for other O-glycosylated threonines. Generating Enzyme: polypeptide
      N-acetylgalactosaminyltransferase (EC 2.4.1.41).'
    synonyms:
    - O3-(N-acetylgalactosaminyl)threonine
    - (2S,3R)-2-amino-3-(2-acetamido-2-deoxy-alpha-D-galactopyranosyloxy)butanoic
      acid
    - mucin type O-glycosylthreonine
    identifiers:
    - ns: resid
      id: AA0155
    - ns: chebi
      id: CHEBI:53605
    - ns: pdb.ligand
      id: GTH
    - ns: mod
      id: MOD:00164
    - ns: go
      id: GO:0006493
    structure: OC[C@H]1O[C@@H](O[C@@H]([C@@H](C(=O)O)[NH3+])C)[C@@H]([C@H]([C@H]1O)O)NC(=O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0554:
    id: AA0554
    name: L-threonine 5-hydroxy-oxazole-4-carbonthionic acid
    comments: The amino group of the following amino acid forms a thiopeptide bond.
      This is an amino(sulfanyl)methylidene in the tautomeric form, which is shown
      in the diagram and model.
    synonyms:
    - 2-[(1S,2R)-1-amino-2-hydroxypropyl]-5-hydroxy-1,3-oxazole-4-carbothioic O-acid
    - (4Z)-2-[(1S,2R)-1-amino-2-hydroxypropyl]-4-(sulfanylmethylidene)-1,3-oxazol-5(4H)-one
      [tautomer]
    identifiers:
    - ns: mod
      id: MOD:01878
    - ns: resid
      id: AA0554
    structure: '[S-]/C=C/1\N=C(OC1=O)[C@H]([C@H](O)C)[NH3+]'
    base_monomers:
    - T
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
  AA0239:
    id: AA0239
    name: L-cysteine oxazoline-4-carboxylic acid
    comments: 'Formed by the condensation of a serine hydroxyl with the carbonyl of
      the preceding residue. Generating Enzyme: peptidyl-serine cyclase (EC 4.2.1.-).'
    synonyms:
    - (4S)-2-[(1R)-1-amino-2-sulfanylethyl]-4,5-dihydro-1,3-oxazole-4-carboxylic acid
    - 2-[1-azanyl-2-sulfanylethyl]-4,5-dihydro-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:00244
    - ns: go
      id: GO:0018133
    - ns: resid
      id: AA0239
    structure: OC(=O)[C@@H]1COC(=N1)[C@@H]([NH3+])CS
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0347:
    id: AA0347
    name: L-glutamyl 5-omega-hydroxyceramide ester
    comments: This lipid modification is thought to span the lipid bilayer. A representative
      structure is shown.
    synonyms:
    - (S)-2-amino-5-[30-((2S,3R,4E)-1,3-dihydroxyicos-4-en-2-ylamino)-30-oxotriacontan-1-yloxy]-5-oxopentanoic
      acid
    - 2-[30-(isoglutamyloxy)triacontanoyl]icosasphingosine
    identifiers:
    - ns: mod
      id: MOD:00352
    - ns: resid
      id: AA0347
    - ns: go
      id: GO:0050496
    structure: CCCCCCCCCCCCCCC/C=C/[C@H]([C@@H](NC(=O)CCCCCCCCCCCCCCCCCCCCCCCCCCCCCOC(=O)CC[C@@H](C(=O)O)[NH3+])CO)O
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 61
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 64
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 63
    - molecule: Monomer
      element: H
      position: 63
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 64
    - molecule: Monomer
      element: H
      position: 64
      charge: 1
  AA0228:
    id: AA0228
    name: N6-(phospho-5'-guanosine)-L-lysine
    synonyms:
    - N(zeta)-5'-guanylic-lysine
    - lysine guanosine-5'-monophosphate
    - (2S)-2-amino-6-{[(S)-{[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]amino}hexanoic
      acid (non-preferred name)
    - (2S)-2-amino-6-[[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]amino]hexanoic
      acid
    - epsilon-5'-guanylic-L-lysine
    - 5'-guanylic-N6-L-lysine
    - K
    - N6-(5'-guanylyl)-lysine
    - L-lysine monoanhydride with 5'-guanylic acid
    - (2S)-2-amino-6-(5'-guanosine phosphonamino)hexanoic acid
    - N6-L-lysine 5'-guanosine phosphoramidester
    identifiers:
    - ns: go
      id: GO:0018261
    - ns: pdb-ccd
      id: GPL
    - ns: pdb.ligand
      id: GPL
    - ns: resid
      id: AA0228
    - ns: mod
      id: MOD:00233
    structure: OC(=O)[C@H](CCCCN[P@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1nc(N)[nH]c2=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 39
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    - molecule: Monomer
      element: H
      position: 39
      charge: 1
  AA0408:
    id: AA0408
    name: 3'-geranyl-2',3'-dihydro-2',N2-cyclo-L-tryptophan
    synonyms:
    - (2S,3R)-3-geranyl-2,3-dihydro-2,N(alpha)-cyclo-L-tryptophan
    - (2S,3aR,8aS)-3a-[(2E)-3,7-dimethylocta-2,6-dien-1-yl]-1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole-2-carboxylic
      acid
    identifiers:
    - ns: mod
      id: MOD:00817
    - ns: resid
      id: AA0408
    - ns: chebi
      id: CHEBI:35304
    structure: C/C(=C\C[C@]12C[C@H](N[C@H]1Nc1c2cccc1)C(=O)O)/CCC=C(C)C
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0613:
    id: AA0613
    name: 5-glutamyl N2-ornithine
    comments: This modification is probably produced on the C-terminal glutamic acid
      of a carrier protein as one of a series of intermediates.
    synonyms:
    - 4-amino-5-[(4-amino-1-carboxy-butyl)amino]-5-ketovaleric acid
    - gamma-glutamylornithine
    - N2-(L-isoglutamyl)-L-ornithine
    - (2S)-5-amino-2-[(4S)-4-amino-4-carboxybutanamido]pentanoic acid
    - 4-amino-5-[(4-amino-1-carboxy-butyl)amino]-5-oxopentanoic acid
    - (2S)-5-amino-2-([(4S)-4-amino-4-carboxybutanoyl]amino)pentanoic acid
    - N2-(gamma-glutamyl)ornithine
    identifiers:
    - ns: cas
      id: 56523-61-6
    - ns: mod
      id: MOD:01971
    - ns: resid
      id: AA0613
    structure: O=C[C@H](CCC(=O)N[C@H](C(=O)[O-])CCC[NH3+])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  S, T:
    id: AA0575
    name: L-serine 5-methyloxazoline-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-threonine
      cyclase (EC 4.2.1.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-hydroxyethyl]-5-methyl-1,3-oxazoline-4-carboxylic acid
    - 2-[(1S)-1-azanyl-2-hydroxyethyl]-5-methyl-4,5-dihydro-1,3-oxazole-4-carboxylic
      acid
    - 2-[(1S)-1-amino-2-hydroxyethyl]-5-methyl-4,5-dihydro-1,3-oxazole-4-carboxylic
      acid
    identifiers:
    - ns: mod
      id: MOD:01904
    - ns: resid
      id: AA0575
    structure: OC[C@@H](C1=N[C@@H]([C@H](O1)C)C(=O)O)[NH3+]
    base_monomers:
    - S
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
  AA0050:
    id: AA0050
    name: N-acetyl-L-proline
    synonyms:
    - (2S)-1-acetyl-2-pyrrolidinecarboxylic acid
    - 1-acetylproline
    - acetylproline
    - N-acetylproline
    identifiers:
    - ns: cas
      id: 68-95-1
    - ns: chebi
      id: CHEBI:21560
    - ns: go
      id: GO:0017197
    - ns: mod
      id: MOD:00059
    - ns: resid
      id: AA0050
    structure: CC(=O)N1CCC[C@H]1C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0464:
    id: AA0464
    name: O3-methyl-L-threonine
    synonyms:
    - (2S,3R)-2-amino-3-methoxybutanoic acid
    - O-methyl-L-threonine
    - T
    - o-methyl-l-threonine
    - threonine methyl ether
    - O-methyl threonine
    - (2S,3R)-2-amino-3-methoxy-butanoic acid
    identifiers:
    - ns: resid
      id: AA0464
    - ns: pdb-ccd
      id: OLT
    - ns: pdb.ligand
      id: OLT
    - ns: mod
      id: MOD:01387
    - ns: cas
      id: 4385-90-4
    structure: CO[C@@H]([C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0227:
    id: AA0227
    name: N6-(phospho-5'-adenosine)-L-lysine
    synonyms:
    - 5'-adenylic-N6-L-lysine
    - (2S)-2-amino-6-(5'-adenosine phosphonamino)hexanoic acid
    - L-lysine monoanhydride with 5'-adenylic acid
    - N(zeta)-5'-adenylic-L-lysine
    - epsilon-5'-adenylic-L-lysine
    - N6-L-lysine 5'-adenosine phosphoramidester
    identifiers:
    - ns: pdb.ligand
      id: AMP
    - ns: cas
      id: 35985-27-4
    - ns: resid
      id: AA0227
    - ns: go
      id: GO:0018116
    - ns: mod
      id: MOD:00232
    structure: OC(=O)[C@H](CCCCNP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 37
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    - molecule: Monomer
      element: H
      position: 37
      charge: 1
  AA0114:
    id: AA0114
    name: N6-carboxy-L-lysine
    comments: 'N6-carboxylysine can be produced by artifactual, catalytic or auto-catalytic
      processes. Generating Enzyme: ribulose-bisphosphate carboxylase activase (EC
      6.3.4.-); urease activase (EC 6.3.4.-).'
    synonyms:
    - lysine nz-carboxylic acid
    - lysine NZ-carboxylic acid
    - (2S)-2-amino-6-(carboxyamino)hexanoic acid
    - 2-amino-6-carbamic hexanoic acid
    - K
    - N6-carboxylysine
    - N~6~-carboxy-L-lysine
    - N6-carbamyllysine [misnomer]
    - (2S)-2-azanyl-6-(carboxyamino)hexanoic acid
    identifiers:
    - ns: pdb.ligand
      id: FMT
    - ns: resid
      id: AA0114
    - ns: go
      id: GO:0018235
    - ns: pdb-ccd
      id: KCX
    - ns: mod
      id: MOD:00123
    - ns: cas
      id: 45101-60-8
    - ns: chebi
      id: CHEBI:49185
    structure: '[O-]C(=O)NCCCC[C@@H](C(=O)O)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0031:
    id: AA0031
    name: 2-pyrrolidone-5-carboxylic acid
    comments: 'This modification can form artifactually from amino-terminal glutamine
      under mildly acid conditions, and from amino-terminal glutamic acid under very
      acid or anhydrous conditions. The presumed enzyme in Aplysia neurons has not
      been characterized. The reaction probably requires concomitant hydrolysis of
      a compound such as ATP. Generating Enzyme: glutaminyl-peptide cyclotransferase
      (EC 2.3.2.5) #link GLN.'
    synonyms:
    - (2S)-5-oxopyrrolidine-2-carboxylic acid
    - PCA
    - (2S)-5-oxo-2-pyrrolidinecarboxylic acid
    - 5-oxoproline
    - 2-oxopyrrolidine-5-carboxylic acid
    - 5-pyrrolidone-2-carboxylic acid
    - E
    - pyroglutamic acid
    - 5-oxopyrrolidine-2-carboxylic acid
    - 5-oxo-L-proline
    identifiers:
    - ns: pdb-ccd
      id: PCA
    - ns: cas
      id: 98-79-3
    - ns: chebi
      id: CHEBI:30652
    - ns: resid
      id: AA0031
    - ns: mod
      id: MOD:00420
    - ns: go
      id: GO:0017186
    - ns: mod
      id: MOD:00040
    - ns: pdb.ligand
      id: PCA
    structure: O=C1CC[C@H](N1)C(=O)O
    base_monomers:
    - E
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  AA0615:
    id: AA0615
    name: N6-(3-phosphoglyceryl)-L-lysine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-amino-6-[(2R)-2-hydroxy-3-(phosphonooxy)propanamido]hexanoic acid
    - 3-phosphoglyceryl-lysine
    - (2S)-2-amino-6-([(2R)-2-hydroxy-3-(phosphonooxy)propanoyl]amino)hexanoic acid
    identifiers:
    - ns: resid
      id: AA0615
    - ns: mod
      id: MOD:01973
    structure: O=C([C@@H](COP(=O)([O-])[O-])O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  AA0335:
    id: AA0335
    name: S-amidino-L-cysteine
    comments: 'Generating Enzyme: glycine amidinotransferase (EC 2.1.4.1).'
    synonyms:
    - (2R)-2-amino-3-(carbamimidoylsulfanyl)propanoic acid
    - S-amidinocysteine
    - 2-amino-3-amidinothiopropanoic acid
    - alpha-amino-beta-amidinothiopropionic acid
    - beta-(S-isothiourea)alanine
    - 2-amino-3-amidinosulfanylpropanoic acid
    - beta-amidinothioalanine
    identifiers:
    - ns: go
      id: GO:0046894
    - ns: mod
      id: MOD:00340
    - ns: resid
      id: AA0335
    structure: NC(=[NH2])SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0236:
    id: AA0236
    name: N4-hydroxymethyl-L-asparagine
    comments: N4-methyl-L-asparagine (see RESID:AA0070) was found at a homologous
      position in the closely related species Anabaena variabilis. Since the peptide
      containing this modification was obtained by enzymatic cleavage, not cyanogen
      bromide cleavage, it could have experienced oxidation of the following methionine
      residue, leading to the erroneous attribution of a mass of 29 for the modification
      rather than 14.
    synonyms:
    - N(gamma)-hydroxymethylasparagine
    - (2S)-2-amino-4-[(hydroxymethyl)amino]-4-oxobutanoic acid
    - beta-hydroxymethylasparagine
    - 2-amino-N4-hydroxymethylbutanediamic acid
    - N4-hydroxymethylasparagine
    identifiers:
    - ns: go
      id: GO:0018311
    - ns: resid
      id: AA0236
    - ns: mod
      id: MOD:00241
    structure: OCNC(=O)C[C@@H](C(=O)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0078:
    id: AA0078
    name: N6-myristoyl-L-lysine
    comments: 'Generating Enzyme: peptidyl-lysine N6-myristoyltransferase (EC 2.3.1.-).'
    synonyms:
    - 2-amino-6-(tetradecanamido)hexanoic acid
    - N(zeta)-myristoyllysine
    - (2S)-2-azanyl-6-(tetradecanoylamino)hexanoic acid
    - n~6~-tetradecanoyl-l-lysine
    - epsilon-myristoyllysine
    - N~6~-tetradecanoyl-L-lysine
    - N6-(1-oxotetradecyl)-L-lysine
    - (2S)-2-amino-6-(tetradecanoylamino)hexanoic acid
    identifiers:
    - ns: resid
      id: AA0078
    - ns: go
      id: GO:0018028
    - ns: chebi
      id: CHEBI:21894
    - ns: cas
      id: 62471-07-2
    - ns: mod
      id: MOD:00087
    - ns: pdb-ccd
      id: MYK
    - ns: pdb.ligand
      id: MYK
    structure: CCCCCCCCCCCCCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
    - molecule: Monomer
      element: H
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  AA0371:
    id: AA0371
    name: 1'-(phospho-5'-adenosine)-L-histidine
    comments: The phosphoramide bond is probably formed with the tele-nitrogen of
      histidine in most cases.
    synonyms:
    - N(tau)-5'-adenylic-L-histidine
    - N1'-adenylylated histidine
    - (2S)-2-amino-3-[1-(5'-adenosine phosphono)imidazol-4-yl]propanoic acid
    - L-histidine 5'-adenosine phosphoramidester
    - tele-5'-adenylic-L-histidine
    - L-histidine monoanhydride with 5'-adenylic acid
    identifiers:
    - ns: pdb.ligand
      id: AMP
    - ns: go
      id: GO:0051111
    - ns: mod
      id: MOD:00376
    - ns: resid
      id: AA0371
    structure: OC(=O)[C@@H](Cc1ncn(c1)[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-])[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 39
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    - molecule: Monomer
      element: H
      position: 39
      charge: 1
  AA0312:
    id: AA0312
    name: N6-3,4-didehydroretinylidene-L-lysine
    comments: The all-trans form is shown. Light-induced interconversion with the
      11-cis (4Z) form in porphyropsin and cyanopsin is utilized for light sensing
      in some animals. This modification has been detected but not located by sequencing
      in proteins. It may be substituted for retinal (see RESID:AA0120) in opsin.
    synonyms:
    - N6-3-dehydroretinal-L-lysine
    - N6-3-dehydroretinyl-lysine
    - (S)-2-amino-6-[(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohexa-1,3-dien-1-yl)-2,4,6,8-nonatetraenylidene]aminohexanoic
      acid
    identifiers:
    - ns: resid
      id: AA0312
    - ns: go
      id: GO:0019931
    - ns: mod
      id: MOD:00317
    - ns: cas
      id: 472-87-7
    structure: C[C@@H](/C=C/C=C(/C=C/C1=C(C)C=CCC1(C)C)\C)/C=C/[NH2+]CCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 34
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
    - molecule: Monomer
      element: H
      position: 33
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 34
    - molecule: Monomer
      element: H
      position: 34
      charge: 1
  AA0030:
    id: AA0030
    name: 4-hydroxy-L-proline
    comments: 'Generating Enzyme: procollagen-proline dioxygenase (EC 1.14.11.2);
      hypoxia-inducible factor-proline dioxygenase (EC 1.14.11.29).'
    synonyms:
    - (4R)-4-hydroxy-L-proline
    - gamma-hydroxypyrrolidine-alpha-carboxylic acid
    - 4-hydroxyproline
    - P
    - L-threo-4-hydroxyproline
    - 4-trans-hydroxy-L-proline
    - (2S,4R)-4-hydroxypyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb.ligand
      id: HYP
    - ns: chebi
      id: CHEBI:61965
    - ns: resid
      id: AA0030
    - ns: pdb-ccd
      id: HYP
    - ns: go
      id: GO:0018401
    - ns: mod
      id: MOD:00039
    - ns: cas
      id: 51-35-4
    structure: O[C@H]1C[NH2+][C@@H](C1)C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  E, G:
    id: AA0378
    name: 2-imino-glutamic acid 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a glutamic acid, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N, and the loss of a molecule of water. This
      cross-link is accompanied by modification of residue N+1. The modified residue
      N+1 is presented in a separate entry and is not included in the mass accounting
      of this entry. The backbone atoms of residue N+1 are shown in gray in the diagram.
      Generating Enzyme: autocatalytic.'
    synonyms:
    - 4-[(4z)-1-(carboxymethyl)-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-2-yl]-4-iminobutanoic
      acid
    - 2-imino-glutamyl-5-imidazolinone glycine
    - (4Z)-4-[(4E)-1-(carboxymethyl)-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-2-yl]-4-iminobutanoic
      acid
    - 4-azanylidene-4-[(4E)-1-(carboxymethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-2-yl]butanoic
      acid
    - EYG
    - 2,N-didehydroglutamyl-5-imidazolinone glycine
    - 4-[1-(carboxymethyl)-5-oxo-4,5-dihydro-1H-imidazol-2-yl]-4-iminobutanoic acid
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - '[2-(3-carboxy-1-iminopropyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid'
    - 2-(3-carboxy-1-iminopropyl)-1-carboxymethyl-1-imidazolin-5-one
    identifiers:
    - ns: pdb-ccd
      id: CRU
    - ns: resid
      id: AA0378
    - ns: go
      id: GO:0051358
    - ns: pdb.ligand
      id: CRU
    - ns: mod
      id: MOD:00383
    structure: O=CCN1C(=O)CN=C1C(=N)CCC(=O)[O-]
    base_monomers:
    - E
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
  C, V:
    id: AA0468
    name: L-valine 5-(methoxymethyl)thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-methylpropyl]-5-(methoxymethyl)-1,3-thiazole-4-carboxylic
      acid
    - 2-[1-azanyl-2-methylpropyl]-5-(methoxymethyl)-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0468
    - ns: mod
      id: MOD:01391
    structure: COCc1sc(nc1C(=O)O)[C@H](C(C)C)[NH3+]
    base_monomers:
    - V
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
  AA0406:
    id: AA0406
    name: O-xylosyl-L-serine
    comments: One glycosylated serine with weak electron density was modeled as O3-alpha-xylosylserine,
      while O3-alpha-mannosyl serine and threonine were modeled at ten other positions.
      The authors do not discuss this exception or provide chemical evidence for it.
      Since an O3-xylosyl serine modification has not been reported in any other fungal
      proteins, the modification is probably also an O3-alpha-mannosyl serine (see
      RESID:AA0402). See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210,
      RESID:AA0291, RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400,
      RESID:AA0402, RESID:AA0404, and RESID:AA0422 for other O-glycosylated serines.
    synonyms:
    - O3-xylosylserine
    - O-(beta-D-xylopyranosyl)-L-serine
    - (2S)-2-amino-3-(alpha-D-xylopyranosyloxy)propanoic acid
    - O-glycosylserine
    identifiers:
    - ns: resid
      id: AA0406
    - ns: mod
      id: MOD:00814
    - ns: pdb.ligand
      id: XYS
    - ns: cas
      id: 6050-71-1
    structure: OC(=O)[C@H](CO[C@H]1OC[C@H]([C@@H]([C@H]1O)O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0234:
    id: AA0234
    name: S-methyl-L-cysteine
    comments: 'For methylated--DNA--[protein]-cysteine S-methyltransferase (EC 2.2.1.63),
      the Enzyme Commission acknowledges that "This enzyme catalyses only one turnover
      and therefore is not strictly catalytic." Generating Enzyme: autocatalytic;
      methylated--DNA--[protein]-cysteine S-methyltransferase (EC 2.2.1.63); protein-cysteine
      methyltransferase, NleE (EC 2.2.1.-).'
    synonyms:
    - (2R)-2-amino-3-methylsulfanyl-propanoic acid
    - s-methylcysteine
    - (R)-2-amino-3-(methylsulfanyl)propanoic acid
    - C
    - S-methyl-L-cysteine
    - L-3-(methylthio)alanine
    identifiers:
    - ns: resid
      id: AA0234
    - ns: pdb.ligand
      id: SMC
    - ns: go
      id: GO:0018125
    - ns: mod
      id: MOD:00239
    - ns: pdb-ccd
      id: SMC
    - ns: cas
      id: 1187-84-4
    structure: CSC[C@H]([NH3+])C(=O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0396:
    id: AA0396
    name: 3-(S-L-cysteinyl)-L-tyrosine
    comments: This modification should not be confused with 3'-(S-L-cysteinyl)-L-tyrosine
      (see RESID:AA0113).
    synonyms:
    - (2S,3R)-2-amino-3-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-3-(4-hydroxyphenyl)propanoic
      acid
    - 2-amino-3-(2-amino-2-carboxyethylthio)-3-(4-hydroxyphenyl)propanoic acid
    - S-(tyros-3'-yl)cysteine
    identifiers:
    - ns: resid
      id: AA0396
    - ns: mod
      id: MOD:00803
    structure: O=C[C@H]([C@@H](c1ccc(cc1)O)SC[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - Y
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0558:
    id: AA0558
    name: S-(spermidinoglutathion-S-yl)-L-cysteine
    synonyms:
    - L-gamma-glutamyl-[S-(L-cystein-S-yl)]-L-cysteinyl-N-{3-[(4-aminobutyl)amino]propyl}glycinamide
    - cysteine glutathionylspermidine disulfide
    - (2R)-2-amino-3-([(2R)-2-([(4S)-4-amino-4-carboxybutanoyl]amino)-2-([2-([3-([4-aminobutyl]amino)propyl]carbamoyl)methyl]carbamoyl)ethyl]disulfanyl)propanoic
      acid
    identifiers:
    - ns: chebi
      id: CHEBI:16613
    - ns: pdb.ligand
      id: TS5
    - ns: resid
      id: AA0558
    - ns: cas
      id: 33932-35-3
    - ns: mod
      id: MOD:01848
    structure: '[NH3+]CCCC[NH2+]CCCNC(=O)CNC(=O)[C@@H](NC(=O)CC[C@@H](C(=O)[O-])[NH3+])CSSC[C@@H](C=O)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 34
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 34
    - molecule: Monomer
      element: H
      position: 34
      charge: 1
  AA0256:
    id: AA0256
    name: O4'-(phospho-5'-uridine)-L-tyrosine
    comments: 'Generating Enzyme: uridylyltransferase (EC 2.7.7.59).'
    synonyms:
    - hydrogen 5'-uridylate tyrosine ester
    - O4'-L-tyrosine 5'-uridine phosphodiester
    - (S)-2-amino-3-[4-(5'-uridine phosphonoxy)phenyl]propanoic acid
    - 5'-uridylic-O-tyrosine
    identifiers:
    - ns: go
      id: GO:0018165
    - ns: mod
      id: MOD:00261
    - ns: resid
      id: AA0256
    structure: OC(=O)[C@H](Cc1ccc(cc1)O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1ccc(=O)[nH]c1=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 39
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    - molecule: Monomer
      element: H
      position: 39
      charge: 1
  AA0622:
    id: AA0622
    name: 2-(L-cystein-S-yl)-asparagine
    synonyms:
    - alpha-(L-cystein-S-yl)-D-asparagine
    - (2S)-2,4-diamino-2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-4-oxobutanoic acid
    identifiers:
    - ns: pdb.ligand
      id: DSG
    - ns: mod
      id: MOD:01985
    - ns: resid
      id: AA0622
    structure: O=C[C@H](CS[C@](C(=O)O)(CC(=O)N)N)[NH3+]
    base_monomers:
    - N
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  K, K:
    id: AA0430
    name: L-dehydrolysinonorleucine
    comments: 'Although it should not be possible to distinguish dehydrolysinonorleucine
      from lysinonorleucine in the X-ray structure, the cross-link was probably not
      reduced. After the oxidation of a lysine to allysine (see RESID:AA0121), this
      cross-link forms spontaneously with a Schiff-base reaction. In this aleatoric
      modification two peptide chains may be crosslinked with the peptides contributing
      a lysine in either biosynthetic position. The lysines forming the cross-link
      may also be hydroxylated and glycosylated (see RESID:AA0028 and RESID:AA0153).
      Generating Enzyme: lysyl oxidase (EC 1.4.3.13).'
    synonyms:
    - dehydrolysylnorleucine
    - dehydrolysinorleucine [misspelling]
    - 6-(N6-L-didehydrolysino)-L-norleucine
    - didehydrolysinonorleucine
    - N6-[(5S)-5-amino-5-carboxypentylidene]-L-lysine
    - (2S)-2-amino-6-([(5S)-5-amino-5-carboxypentylidene]amino)hexanoic acid
    identifiers:
    - ns: resid
      id: AA0430
    - ns: chebi
      id: CHEBI:64748
    - ns: cas
      id: 31504-14-0
    - ns: mod
      id: MOD:01176
    structure: O=C[C@H](CCCC[NH2+]CCCC[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0273:
    id: AA0273
    name: 2-methyl-L-glutamine
    synonyms:
    - (2S)-2,5-diamino-2-methyl-5-oxo-pentanoic acid
    - 2-methylglutamine
    - 2-methyl-L-glutamine
    - 2-methyl-glutamine
    - alpha-methylglutamine
    - Q
    - (S)-2-amino-2-methylpentanediamic acid
    identifiers:
    - ns: go
      id: GO:0018361
    - ns: cas
      id: 4247-16-9
    - ns: pdb.ligand
      id: MGN
    - ns: resid
      id: AA0273
    - ns: pdb-ccd
      id: MGN
    - ns: mod
      id: MOD:00278
    structure: NC(=O)CC[C@@](C(=O)O)([NH3+])C
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0272:
    id: AA0272
    name: 5-methyl-L-arginine
    comments: This modification should not be confused with N5-methylarginine (see
      RESID:AA0305). In methyl-coenzyme M reductase the arginine 5-methyl group is
      derived from S-adenosyl-methionine and is not produced as a side reaction of
      the enzyme.
    synonyms:
    - 2-amino-5-guanidinohexanoic acid
    - amino{[(1S,4S)-4-amino-4-carboxy-1-methylbutyl]amino}methaniminium
    - 5-methyl-arginine
    - (2S,5S)-2-amino-5-carbamimidamidohexanoic acid
    - delta-methylarginine
    - R
    - 4-methylarginine [misnomer]
    - '[amino-[[(2S,5S)-5-amino-6-hydroxy-6-oxo-hexan-2-yl]amino]methylidene]azanium'
    identifiers:
    - ns: resid
      id: AA0272
    - ns: mod
      id: MOD:00277
    - ns: pdb.ligand
      id: AGM
    - ns: pdb-ccd
      id: AGM
    - ns: go
      id: GO:0018181
    structure: OC(=O)[C@H](CC[C@@H]([NH+]=C(N)N)C)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0128:
    id: AA0128
    name: L-3-phenyllactic acid
    synonyms:
    - (2S)-2-hydroxy-3-phenylpropanoic acid
    - (2S)-2-hydroxy-3-phenyl-propanoic acid
    - X
    - alpha-hydroxy-beta-phenyl-propionic acid
    identifiers:
    - ns: resid
      id: AA0128
    - ns: cas
      id: 20312-36-1
    - ns: pdb-ccd
      id: HFA
    - ns: mod
      id: MOD:00137
    - ns: go
      id: GO:0018058
    structure: O[C@H](C(=O)O)Cc1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
  AA0592:
    id: AA0592
    name: 2-(2-aminosuccinimidyl)-3-sulfanylpropanoic acid
    comments: 'This cross-link is formed by the condensation of an aspartic acid or
      asparagine residue with the alpha-amido of the following residue. Generating
      Enzyme: autocatalytic.'
    synonyms:
    - (2r)-2-[(3s)-3-amino-2,5-dioxopyrrolidin-1-yl]-3-sulfanylpropanoic acid
    - DC
    - (2R)-2-[(3S)-3-amino-2,5-dioxo-pyrrolidin-1-yl]-3-sulfanyl-propanoic acid
    - (2R)-2-[(3S)-3-amino-2,5-dioxopyrrolidin-1-yl]-3-sulfanylpropanoic acid
    - aspartimide cysteine
    identifiers:
    - ns: mod
      id: MOD:01939
    - ns: mod
      id: MOD:01938
    - ns: pdb.ligand
      id: SIC
    - ns: resid
      id: AA0592
    - ns: pdb-ccd
      id: SIC
    structure: SC[C@H](N1C(=O)C[C@@H](C1=O)N)C(=O)O
    base_monomers:
    - N
    - D
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0330:
    id: AA0330
    name: 3-methyl-L-lanthionine sulfoxide
    comments: The S-oxide of 3-methyl-L-lanthionine is a chiral center, and the stereoisomer
      has not been determined.
    synonyms:
    - 3-methyl-L-lanthionine S-oxide
    - (2S,3S,4Xi,6R)-2,6-diamino-3-methyl-4-oxo-4-thiaheptanedioic acid
    - (2S,3S,SXi)-2-amino-3-([(R)-2-amino-2-carboxyethyl]sulfinyl)butanoic acid
    - S-oxy-3-methyllanthionine
    identifiers:
    - ns: mod
      id: MOD:00335
    - ns: go
      id: GO:0046804
    - ns: resid
      id: AA0330
    structure: O=C[C@H](C[S@](=O)[C@H]([C@H](C(=O)O)N)C)N
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  AA0516:
    id: AA0516
    name: N-[(12R)-12-hydroxymyristoyl]-L-cysteine
    synonyms:
    - 2-[(12R)-12-hydroxytetradecanoyl]amino-3-sulfanylpropanoic acid
    - N-[(12R)-12-hydroxytetradecanoyl]cysteine
    identifiers:
    - ns: resid
      id: AA0516
    - ns: mod
      id: MOD:01690
    structure: CC[C@H](CCCCCCCCCCC(=O)N[C@H](C(=O)O)CS)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0365:
    id: AA0365
    name: (E)-2,3-didehydrotyrosine
    synonyms:
    - (2E)-2-amino-3-(4-hydroxyphenyl)prop-2-enoic acid
    - 4-[(E)-[2-(3-methylsulfanylpropanoyl)-5-oxo-1-(2-oxoethyl)imidazol-4-ylidene]methyl]phenolate
    - trans-dehydrotyrosine
    - MYG
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - blue non-fluorescent pocilloporin chromophore
    - 4-{(z)-[2-[3-(methylsulfanyl)propanoyl]-5-oxo-1-(2-oxoethyl)-1,5-dihydro-4h-imidazol-4-ylidene]methyl}benzenolate
    - 4-[(E)-{2-[3-(methylsulfanyl)propanoyl]-5-oxo-1-(2-oxoethyl)-1,5-dihydro-4H-imidazol-4-ylidene}methyl]phenolate
    - amino-(para-hydroxybenzylidenyl)acetic acid
    identifiers:
    - ns: mod
      id: MOD:00370
    - ns: pdb-ccd
      id: CRK
    - ns: resid
      id: AA0365
    - ns: pdb.ligand
      id: CRK
    - ns: go
      id: GO:0018251
    structure: Oc1ccc(cc1)/C=C(\C(=O)O)/N
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0606:
    id: AA0606
    name: N4-(2,4-diacetamido-2,4,6-trideoxy-D-glucosyl)-L-asparagine
    comments: Bacillosamine is a trivial name formed by modification of a non-standard
      monosaccharide parent name, and is not recommended by the IUPAC Nomenclature
      Committee. Some authors use bacillosamine to refer to the diacetylated form,
      rather than the unacetylated form.
    synonyms:
    - DATDH
    - DABA
    - DiNAcBac
    - (2S)-2-amino-4-[(2,4-diacetylamino-2,4,6-trideoxy-beta-D-glucopyranosyl)amino]-4-oxobutanoic
      acid
    - N4-[N,N-diacetylbacillosaminyl]asparagine
    - N4-[2,4-bis(acetylamino)-2,4,6-trideoxy-beta-D-glucopyranosyl]-L-asparagine
    - N4-[N2,N4-diacetylbacillosaminyl]asparagine
    identifiers:
    - ns: resid
      id: AA0606
    - ns: mod
      id: MOD:01962
    - ns: pdb.ligand
      id: B6D
    structure: O=C(N[C@@H]1O[C@H](C)[C@H]([C@@H]([C@H]1NC(=O)C)O)NC(=O)C)C[C@@H](C(=O)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
    - molecule: Monomer
      element: H
      position: 30
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
  AA0204:
    id: AA0204
    name: S-(2-aminovinyl)-D-cysteine
    comments: 'This cross-link arises from the decarboxylation of the carboxyl-terminal
      portion of a lanthionine, either L-lanthionine (see RESID:AA0110) or meso-lanthionine
      (see RESID:AA0111). This residue is acid labile. It may be identified as (2-aminoethyl)-D-cysteine
      (D-4-thialysine) after hydrogenation with palladium/charcoal catalyst. For the
      L stereoisomer, see RESID:AA0548. The stereochemistry of the (2-aminovinyl)-cysteine
      derived from two L-cysteine residues in cypemycin has not been determined. Generating
      Enzyme: peptidyl-cysteine dethiolase (EC 4.4.1.-) #link CYS2; peptidyl-phosphoserine/phosphothreonine
      dehydratase (EC 4.2.1.-) #link SER; peptidyl-cysteine dehydroalanine/dehydrobutyrine
      ligase (EC 6.2.-.-).'
    synonyms:
    - (S,Z)-S-(2-aminovinyl)cysteine
    - (2S)-2-amino-3-([(Z)-2-aminoethenyl]sulfanyl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0204
    - ns: mod
      id: MOD:01849
    - ns: go
      id: GO:0018096
    - ns: mod
      id: MOD:00209
    structure: N/C=C\SC[C@H]([NH3+])C(=O)O
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0130:
    id: AA0130
    name: N2-succinyl-L-tryptophan
    synonyms:
    - (2S)-2-(3-carboxypropanoyl)amino-3-(1H-indol-3-yl)propanoic acid
    - (2S)-2-amino-(6,7-dihydro-6,7-dioxo-1H-indole)-3-propanoic acid
    identifiers:
    - ns: resid
      id: AA0130
    - ns: go
      id: GO:0018062
    - ns: mod
      id: MOD:00139
    - ns: cas
      id: 514803-26-0
    structure: O=C[C@H](Cc1c[nH]c2c1cccc2)NC(=O)CCC(=O)[O-]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0260:
    id: AA0260
    name: phycourobilin-bis-L-cysteine
    comments: There are additional chiral centers at C-3alpha, C-4, C-16 and C-18alpha.
    synonyms:
    - 3,18-bis(1-[(R)-2-amino-2-carboxyethyl]sulfanylethyl)-8,12-bis(2-carboxyethyl)-2,7,13,17-tetramethyl-4,5,15,16-tetrahydro-(21H,22H,24H)-bilene-b-1,19(4H,16H)-dione
    - PUB
    - phycourobilin biscysteine adduct
    - 3,18-bis(1-[(R)-2-amino-2-carboxyethyl]sulfanylethyl)-2,7,13,17-tetramethyl-1,19-dioxo-4,5,15,16-tetrahydro-(21H,22H,24H)-bilene-b-8,12-dipropanoic
      acid
    identifiers:
    - ns: go
      id: GO:0017010
    - ns: mod
      id: MOD:00265
    - ns: cas
      id: 61932-71-6
    - ns: resid
      id: AA0260
    - ns: pdb.ligand
      id: PUB
    structure: O=C[C@H](CS[C@H](C1=C(C)[C@H](NC1=O)Cc1[nH]c(c(c1C)CCC(=O)[O-])Cc1[nH]c(c(c1CCC(=O)[O-])C)C[C@@H]1NC(=O)C(=C1[C@H](SC[C@@H](C=O)[NH3+])C)C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0328:
    id: AA0328
    name: (3-aminopropyl)(L-aspartyl-1-amino)phosphoryl-5'-adenosine
    comments: The structure shown has been independently confirmed. Asparagine is
      converted to an aspartyl-1-amide by a process requiring two ATP molecules and
      the formation of a peptidyl-succinimide intermediate. The phosphorus atom is
      a chiral center that has not been resolved.
    synonyms:
    - 5'-O-[(3-aminopropoxy)(L-aspart-1-ylamino)phosphoryl]adenosine
    - microcin C7 asparagine modification
    - 9-(5'-O-[(3-aminopropoxy)(L-aspart-1-ylamino)phosphoryl]-beta-D-ribofuranosyl)adenine
    - N-(aspart-1-yl)-O-(3-aminopropyl)-O-(5'-adenosyl)phosphoramide
    identifiers:
    - ns: chebi
      id: CHEBI:60869
    - ns: go
      id: GO:0046550
    - ns: resid
      id: AA0328
    - ns: mod
      id: MOD:00333
    structure: '[NH3+]CCCO[P@](=O)(NC(=O)[C@H](CC(=O)[O-])N)OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@@H]2N'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0069:
    id: AA0069
    name: omega-N-methyl-L-arginine
    comments: 'Generating Enzyme: histone-arginine N-methyltransferase (EC 2.1.1.125);
      [myelin basic protein]-arginine N-methyltransferase (EC 2.1.1.126).'
    synonyms:
    - (2S)-2-amino-5-[(imino(methylamino)methyl)amino]pentanoic acid
    - NG-methylarginine
    identifiers:
    - ns: resid
      id: AA0069
    - ns: cas
      id: 17035-90-4
    - ns: chebi
      id: CHEBI:28229
    - ns: go
      id: GO:0018216
    - ns: mod
      id: MOD:00078
    structure: CNC(=[NH2])NCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0537:
    id: AA0537
    name: 3'-nitro-L-tyrosine
    comments: This modification is produced artifactually by treatment with peroxynitrite.
    synonyms:
    - meta-nitro-tyrosine
    - (2S)-2-amino-3-(4-hydroxy-3-nitro-phenyl)propanoic acid
    - (2S)-2-amino-3-(4-hydroxy-3-nitrophenyl)propanoic acid
    - 3-nitrotyrosine
    - Y
    - m-nitrotyrosine
    - 3-nitro-L-tyrosine
    - meta-nitrotyrosine
    identifiers:
    - ns: pdb-ccd
      id: NIY
    - ns: chebi
      id: CHEBI:44454
    - ns: mod
      id: MOD:01786
    - ns: resid
      id: AA0537
    - ns: pdb.ligand
      id: NIY
    - ns: cas
      id: 3604-79-3
    structure: OC(=O)[C@H](Cc1ccc(c(c1)N(=O)=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0106:
    id: AA0106
    name: S-palmitoyl-L-cysteine
    comments: 'Although the predominant palmitoyl transferase in mammalian systems
      appears to utilize a mixture of saturated and unsaturated fatty acids, some
      systems may be more specific in their incorporation of other fatty acids.  See
      RESID:AA0307 and RESID:AA0308. This modification should not be confused with
      N-palmitoyl-cysteine (see RESID:AA0060). Generating Enzyme: protein-cysteine
      S-palmitoyltransferase (EC 2.3.1.-).'
    synonyms:
    - 2-amino-3-(hexadecanoylthio)propanoic acid
    - cysteine hexadecanoate thioester
    - (2R)-2-amino-3-hexadecanoylsulfanyl-propanoic acid
    - s-palmitoyl-l-cysteine
    - C
    - cysteine palmitate thioester
    - (2R)-2-amino-3-(hexadecanoylsulfanyl)propanoic acid
    - S-hexadecanoyl-L-cysteine
    identifiers:
    - ns: go
      id: GO:0018230
    - ns: pdb.ligand
      id: PLM
    - ns: mod
      id: MOD:00115
    - ns: resid
      id: AA0106
    - ns: cas
      id: 114507-35-6
    - ns: pdb-ccd
      id: P1L
    structure: CCCCCCCCCCCCCCCC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
  AA0522:
    id: AA0522
    name: O4-(8alpha-FAD)-L-aspartate
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - 8alpha-[(4-aspartyl)oxy]FAD
    - (2S)-2-amino-4-oxo-4-[8alpha-riboflavin 5'-(trihydrogen diphosphate) 5'->5'-ester
      with adenosine]oxybutanoic acid
    identifiers:
    - ns: resid
      id: AA0522
    - ns: pdb.ligand
      id: FAD
    - ns: mod
      id: MOD:01668
    structure: O=C(C[C@@H](C(=O)O)[NH3+])OC[C@@H]1C=c2c(C=C1C)nc1c(n2C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(O[P@](=O)(OC[C@H]2O[C@H]([C@@H]([C@@H]2O)O)n2cnc3c2NC=N[C@H]3N)[O-])[O-])O)O)O)[nH]c(=O)[nH]c1=O
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  G, N:
    id: AA0441
    name: (2-aminosuccinimidyl)acetic acid
    comments: 'This cross-link is formed by the condensation of an aspartic acid or
      asparagine residue with the alpha-amido of the following residue. Generating
      Enzyme: autocatalytic.'
    synonyms:
    - anhydroaspartyl glycine
    - (3-amino-2,5-dioxo-1-pyrrolidinyl)acetic acid
    - aspartimide glycine
    - '[(3S)-3-amino-2,5-dioxopyrrolidin-1-yl]acetic acid'
    - N-(2-aminosuccinyl)glycine
    identifiers:
    - ns: mod
      id: MOD:01624
    - ns: mod
      id: MOD:00952
    - ns: resid
      id: AA0441
    - ns: pdb.ligand
      id: ACY
    - ns: chebi
      id: CHEBI:45890
    structure: OC(=O)CN1C(=O)C[C@@H](C1=O)N
    base_monomers:
    - N
    - D
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0463:
    id: AA0463
    name: 3-hydroxy-L-valine
    synonyms:
    - V
    - (2S)-2-amino-3-hydroxy-3-methyl-butanoic acid
    - 3-hydroxyvaline
    - 3-hydroxy-l-valine
    - 3-hydroxy-L-valine
    - (2S)-2-amino-3-hydroxy-3-methylbutanoic acid
    identifiers:
    - ns: mod
      id: MOD:01386
    - ns: resid
      id: AA0463
    - ns: pdb-ccd
      id: HVA
    structure: OC(=O)[C@H](C(O)(C)C)[NH3+]
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0262:
    id: AA0262
    name: L-cysteine sulfinic acid
    synonyms:
    - 3-sulfinoalanine
    - cysteine-S,S-dioxide [tautomer]
    - (2R)-2-azanyl-3-[(S)-oxidanylsulfinyl]propanoic acid
    - S-sulfinocysteine
    - (2R)-2-amino-3-sulfinopropanoic acid
    - 3-sulphinoalanine
    - C
    - cysteine sulphinic acid
    - 2-amino-3-(dioxido-lambda(6)-sulfanyl)propanoic acid [tautomer]
    - 2-amino-2-carboxyethanesulfinic acid
    - 2-amino-3-sulfonylpropanoic acid [tautomer]
    - 3-sulfino-L-alanine
    - S-cysteinesulfinic acid
    identifiers:
    - ns: go
      id: GO:0018171
    - ns: mod
      id: MOD:00267
    - ns: chebi
      id: CHEBI:61964
    - ns: pdb.ligand
      id: CSD
    - ns: cas
      id: 1115-65-7
    - ns: resid
      id: AA0262
    - ns: pdb-ccd
      id: CSD
    structure: O[S](C[C@@H](C(=O)O)N)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0387:
    id: AA0387
    name: O-decanoyl-L-threonine
    comments: 'Generating Enzyme: ghrelin O-acyltransferase, GOAT (EC 2.3.1.-).'
    synonyms:
    - (2S)-2-amino-3-(decanoyloxy)propanoic acid
    - O3-decanoyl-L-threonine
    - L-threonine decanoate ester
    identifiers:
    - ns: resid
      id: AA0387
    - ns: mod
      id: MOD:00392
    - ns: go
      id: GO:0042050
    structure: CCCCCCCCCC(=O)O[C@@H]([C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  C, W:
    id: AA0313
    name: 4'-(S-L-cysteinyl)-L-tryptophyl quinone
    synonyms:
    - 3-(2-amino-2-carboxyethyl)-4-[2-amino-2-carboxyethyl]sulfanyl-6,7-indolinedione
    - cysteine tryptophylquinone
    - 4-(S-cysteinyl)tryptophan-6,7-dione
    - (2R)-2-amino-3-[(3-[(2S)-2-amino-2-carboxyethyl]-6,7-dioxo-6,7-dihydro-1H-indol-4-yl)sulfanyl]propanoic
      acid
    - CTQ
    identifiers:
    - ns: resid
      id: AA0313
    - ns: go
      id: GO:0019927
    - ns: mod
      id: MOD:00318
    structure: O=C[C@H](CSC1=CC(=O)C(=O)c2c1c(c[nH]2)C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - W
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  C, F:
    id: AA0243
    name: L-phenylalanine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-phenylethyl]-1,3-thiazole-4-carboxylic acid
    - 2-[1-azanyl-2-phenylethyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: go
      id: GO:0018139
    - ns: pdb.ligand
      id: BB9
    - ns: resid
      id: AA0243
    - ns: mod
      id: MOD:00248
    structure: OC(=O)c1csc(n1)[C@H](Cc1ccccc1)[NH3+]
    base_monomers:
    - F
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0146:
    id: AA0146
    name: L-3',4'-dihydroxyphenylalanine
    synonyms:
    - L-DOPA
    - (2S)-2-azanyl-3-[3,4-bis(oxidanyl)phenyl]propanoic acid
    - F
    - L-3'-hydroxytyrosine
    - (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoic acid
    - 3-hydroxy-L-tyrosine
    - levodopa
    - 3,4-dihydroxyphenylalanine
    identifiers:
    - ns: pdb-ccd
      id: DAH
    - ns: go
      id: GO:0018067
    - ns: mod
      id: MOD:00155
    - ns: resid
      id: AA0146
    - ns: pdb.ligand
      id: DAH
    - ns: cas
      id: 59-92-7
    structure: OC(=O)[C@H](Cc1ccc(c(c1)O)O)[NH3+]
    base_monomers:
    - F
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0244:
    id: AA0244
    name: L-cysteine thiazole-4-carboxylic acid
    comments: "Formed by the condensation of a cysteine thiol with the carbonyl of\
      \ the preceding residue and alpha-beta dehydrogenation. The first cysteine may\
      \ be condensed on the carbonyl of the residue preceding it, forming a 2,4'-bithiazole\
      \ structure. Generating Enzyme: peptidyl-cysteine cyclase (EC 4.2.1.-); peptidyl-thiazoline\
      \ dehydrogenase (EC 1.3.-.-)."
    synonyms:
    - 2-[1-azanyl-2-sulfanylethyl]-1,3-thiazole-4-carboxylic acid
    - 2-[(1S)-1-amino-2-sulfanylethyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0244
    - ns: pdb.ligand
      id: BB9
    - ns: mod
      id: MOD:00249
    - ns: go
      id: GO:0018140
    structure: OC(=O)c1csc(n1)[C@@H]([NH3+])CS
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0503:
    id: AA0503
    name: 5-glutamyl 2-aminoadipic 6-phosphoric anhydride
    comments: 'Generating Enzyme: LysW-L-glutamate/LysW-L-2-aminoadipate kinase, LysZ
      (EC 2.7.2.-).'
    synonyms:
    - (2S)-2-([(4S)-4-amino-4-carboxybutanoyl]amino)-6-oxo-6-(phosphonooxy)hexanoic
      acid
    identifiers:
    - ns: resid
      id: AA0503
    - ns: mod
      id: MOD:01606
    structure: O=C[C@H](CCC(=O)N[C@H](C(=O)[O-])CCCC(=O)OP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  C, S, S:
    id: AA0470
    name: L-cysteine pyridine-2,5-dicarboxylic acid
    comments: Formed by the metathesis of two didehydroalanines made from serines,
      condensation with a cysteine carbonyl and dehydrogenation. This modification
      is currently represented in the PDB as part of the HET group for the entire
      molecule of antibiotic GE2270 A.
    synonyms:
    - 6-[(1R)-1-amino-2-sulfanylethyl]pyridine-2,5-dicarboxylic acid
    identifiers:
    - ns: resid
      id: AA0470
    - ns: mod
      id: MOD:01393
    - ns: pdb.ligand
      id: GEA
    structure: SC[C@@H](c1nc(ccc1C=O)C(=O)O)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
  AA0518:
    id: AA0518
    name: N5-(ADP-ribosyl)-L-glutamine
    comments: 'It is not known whether Photorhabdus luminescens toxin catalyzes formation
      of the alpha or beta isomer. The alpha form is presented. The keyword "phosphoprotein"
      is not used with toxin modification. Generating Enzyme: NAD(P)+--glutamine ADP-ribosyltransferase
      TccC5 (EC 2.4.2.-).'
    synonyms:
    - N5-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-glutamine
    - (S)-2-amino-4-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]amino)-5-oxopentanoic
      acid
    - N5-alpha-D-ribofuranosyl-L-glutamine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    identifiers:
    - ns: resid
      id: AA0518
    - ns: mod
      id: MOD:01662
    structure: O=C(N[C@H]1O[C@H]([C@H]([C@H]1O)O)CO[P@@](=O)(O[P@](=O)(OC[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-])[O-])CC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 52
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 55
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 54
    - molecule: Monomer
      element: H
      position: 54
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 55
    - molecule: Monomer
      element: H
      position: 55
      charge: 1
  AA0389:
    id: AA0389
    name: O4-galactosyl-L-hydroxyproline
    comments: See also RESID:AA0212 and RESID:AA0390 for other O4-glycosylated 4-hydroxyprolines.
    synonyms:
    - (2S,4R)-4-(beta-D-galactopyranosyloxy)pyrrolidine-2-carboxylic acid
    - 4-(beta-D-galactopyranosyloxy)proline
    - 4-(galactosyloxy)proline
    - beta-galactopyranosyl-4-hydroxyproline
    - O4-glycosyl-hydroxyproline
    identifiers:
    - ns: mod
      id: MOD:00757
    - ns: resid
      id: AA0389
    structure: OC[C@H]1O[C@@H](O[C@H]2C[NH2+][C@@H](C2)C(=O)O)[C@@H]([C@H]([C@H]1O)O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0154:
    id: AA0154
    name: O-(N-acetylaminogalactosyl)-L-serine
    comments: 'See also RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291, RESID:AA0296,
      RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0402, RESID:AA0404,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: polypeptide N-acetylgalactosaminyltransferase (EC 2.4.1.41).'
    synonyms:
    - O3-(N-acetylgalactosaminyl)serine
    - (2S)-2-amino-3-(2-acetamido-2-deoxy-alpha-D-galactopyranosyloxy)propanoic acid
    - mucin type O-glycosylserine
    identifiers:
    - ns: go
      id: GO:0006493
    - ns: resid
      id: AA0154
    - ns: mod
      id: MOD:00163
    - ns: chebi
      id: CHEBI:53604
    structure: OC[C@H]1O[C@@H](OC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@H]1O)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0259:
    id: AA0259
    name: phycoerythrobilin-bis-L-cysteine
    comments: There are additional chiral centers at C-2, C-3, and C-16. The phytochromobilins
      and phycoerythrobilins transmit red.
    synonyms:
    - PEB
    - (2S,3R,16R)-3,18-bis-[(R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-2,7,13,17-tetramethyl-2,3,15,16-tetrahydrobilin-1,19(21H,22H,24H)-dione
    - 3,18-bis-[1-((2-amino-2-carboxy)ethylsulfanyl)ethyl]-2,3,15,16-tetrahydro-2,7,13,17-tetramethyl-1,19-dioxo-(21H,22H,24H)-biladiene-ab-8,12-dipropanoic
      acid
    - phycoerythrobilin biscysteine adduct
    identifiers:
    - ns: go
      id: GO:0017011
    - ns: resid
      id: AA0259
    - ns: mod
      id: MOD:00264
    - ns: cas
      id: 18097-67-1
    structure: O=C[C@H](CS[C@@H]([C@H]1/C(=C/[C@@H]2[NH2+]/C(=C\c3[nH]c(c(c3CCC(=O)[O-])C)C[C@H]3NC(=O)C(=C3C)[C@@H](SC[C@@H](C=O)[NH3+])C)/C(=C2C)CCC(=O)[O-])/NC(=O)[C@H]1C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0081:
    id: AA0081
    name: L-alanine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-aminopropanamide
    - alaninamide
    identifiers:
    - ns: resid
      id: AA0081
    - ns: go
      id: GO:0018034
    - ns: chebi
      id: CHEBI:21217
    - ns: mod
      id: MOD:00090
    - ns: pdb.ligand
      id: NH2
    - ns: cas
      id: 7324-05-2
    structure: C[C@H]([NH3+])C(=O)N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  AA0370:
    id: AA0370
    name: 4,5-dihydroxy-L-lysine
    comments: Hydroxylations at C-4 and C-5 are assumed. Neither the positions of
      the hydroxylations nor the stereochemistry for the chiral centers they produce
      have been determined. The (2S,4R,5R) stereoisomer is shown.
    synonyms:
    - alpha,epsilon-diamino-delta,gamma-dihydroxycaproic acid
    - (2S,4Xi,5Xi)-2,6-diamino-4,5-dihydroxyhexanoic acid
    - delta,gamma-dihydroxylysine
    identifiers:
    - ns: resid
      id: AA0370
    - ns: mod
      id: MOD:00375
    - ns: go
      id: GO:0030963
    structure: '[NH3+]C[C@H]([C@@H](C[C@@H](C(=O)O)[NH3+])O)O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0264:
    id: AA0264
    name: O-(sn-1-glycerophosphoryl)-L-serine
    comments: The stereochemistry of the glycerol phosphate has not been determined.
      The sn-1 form is assumed.
    synonyms:
    - O3-(sn-1-glycerophosphoryl)-L-serine
    - alpha-glycerophosphoryl serine
    - O3-2,3-dihydroxypropyl hydrogen phosphate-L-serine ester
    - glycerophosphoserine
    - (2S)-2-amino-3-[(2Xi)-2,3-dihydroxypropyl]phosphonoxypropanoic acid
    - O3-L-serine glyceryl-1-phosphodiester
    identifiers:
    - ns: go
      id: GO:0018340
    - ns: pdb.ligand
      id: OPE
    - ns: resid
      id: AA0264
    - ns: cas
      id: 26289-09-8
    - ns: mod
      id: MOD:00269
    structure: OC[C@@H](COP(=O)(OC[C@@H](C(=O)O)[NH3+])[O-])O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0039:
    id: AA0039
    name: O4'-phospho-L-tyrosine
    comments: 'Generating Enzyme: protein-tyrosine kinase (EC 2.7.1.112).'
    synonyms:
    - O4-phosphotyrosine
    - (2S)-2-amino-3-(4-phosphonooxyphenyl)propanoic acid
    - o-phosphotyrosine
    - tyrosine phosphate
    - 2-azanyl-3-(4-phosphonooxyphenyl)propanoic acid
    - O-phosphono-L-tyrosine
    - 2-amino-3-(4-hydroxyphenyl)propanoic acid 4'-phosphate
    - Y
    identifiers:
    - ns: pdb-ccd
      id: PTR
    - ns: resid
      id: AA0039
    - ns: chebi
      id: CHEBI:61972
    - ns: mod
      id: MOD:00048
    - ns: pdb.ligand
      id: PTR
    - ns: go
      id: GO:0018108
    - ns: cas
      id: 21820-51-9
    structure: OC(=O)[C@H](Cc1ccc(cc1)OP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0152:
    id: AA0152
    name: S-glucosyl-L-cysteine
    comments: The beta anomeric form is shown. See also RESID:AA0392 and RESID:AA0560
      for other S-glycosylated cysteines.
    synonyms:
    - S-(beta-D-glucopyranosyl)cysteine
    - (2R)-2-amino-3-[(beta-D-glucopyranosyl)sulfanyl]propanoic acid
    - S-glycosyl-cysteine
    identifiers:
    - ns: resid
      id: AA0152
    - ns: go
      id: GO:0018240
    - ns: mod
      id: MOD:00161
    structure: OC[C@H]1O[C@@H](SC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0096:
    id: AA0096
    name: L-serine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - serinamide
    - aminoserine
    - (2S)-2-amino-3-hydroxypropanamide
    - S
    - (2S)-2-amino-3-hydroxy-propanamide
    - L-serinamide
    identifiers:
    - ns: pdb-ccd
      id: SET
    - ns: chebi
      id: CHEBI:21389
    - ns: resid
      id: AA0096
    - ns: mod
      id: MOD:00105
    - ns: cas
      id: 6791-49-7
    - ns: go
      id: GO:0018049
    - ns: pdb.ligand
      id: NH2
    structure: NC(=O)[C@@H]([NH3+])CO
    base_monomers:
    - S
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0242:
    id: AA0242
    name: L-serine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-hydroxyethyl]-1,3-thiazole-4-carboxylic acid
    - 2-[1-azanyl-2-hydroxyethyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: go
      id: GO:0018138
    - ns: pdb.ligand
      id: BB9
    - ns: mod
      id: MOD:00247
    - ns: resid
      id: AA0242
    structure: OC[C@@H](c1scc(n1)C(=O)O)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0563:
    id: AA0563
    name: L-cysteine bacillithiol disulfide
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - BSH
    - (2S)-(2-[S-(L-cystein-S-yl)-L-cysteinyl]amino-2-deoxy-alpha-D-glucopyranosyloxy)-butanedioic
      acid
    identifiers:
    - ns: chebi
      id: CHEBI:61338
    - ns: mod
      id: MOD:01860
    - ns: resid
      id: AA0563
    structure: O=C[C@H](CSSC[C@@H](C(=O)N[C@@H]1[C@@H](O[C@@H]([C@H]([C@H]1O)O)CO)O[C@H](C(=O)[O-])CC(=O)[O-])[NH3+])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 34
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0380:
    id: AA0380
    name: L-asparagine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, an asparagine, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N+1 which loses one hydrogen, and the loss of
      a molecule of water. This cross-link is accompanied by modification of residue
      N+1. The modified residue N+1 is presented in a separate entry and is not included
      in the mass accounting of this entry. The backbone atoms of residue N+1 are
      shown in gray in the diagram. Generating Enzyme: autocatalytic.'
    synonyms:
    - (2-[(1S)-1,3-diamino-3-oxopropyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic
      acid
    - 2-[(4Z)-2-[(1S)-1,3-diamino-3-oxo-propyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - '{(4Z)-2-[(1S)-1,3-diamino-3-oxopropyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - asparaginyl-5-imidazolinone glycine
    - '[(4z)-2-[(1s)-1,3-diamino-3-oxopropyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    - NYG
    - '[2-(1,3-diamino-3-oxopropyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid'
    - Zoanthus sp. fluorescent protein FP506 chromophore
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-[(S)-1,3-diamino-3-oxopropyl]-1-carboxymethyl-1-imidazolin-5-one
    identifiers:
    - ns: mod
      id: MOD:00385
    - ns: pdb-ccd
      id: NYG
    - ns: resid
      id: AA0380
    - ns: pdb.ligand
      id: NYG
    - ns: go
      id: GO:0051360
    structure: NC(=O)C[C@@H](C1=NCC(=O)N1CC(=O)O)N
    base_monomers:
    - N
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0074:
    id: AA0074
    name: N6,N6,N6-trimethyl-L-lysine
    comments: 'Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12 concerning
      calculation of the difference formula. Generating Enzyme: histone-lysine N-methyltransferase
      (EC 2.1.1.43); cytochrome-c-lysine N-methyltransferase (EC 2.1.1.59); calmodulin-lysine
      N-methyltransferase (EC 2.1.1.60).'
    synonyms:
    - N(zeta)-trimethyllysine
    - 5-azanyl-5-carboxy-N,N,N-trimethylpentanazanium
    - N-[(5S)-5-amino-5-carboxypentyl]-N,N-dimethylmethanaminium
    - K
    - 2-amino-6-(trimethylammonio)hexanoic acid
    - epsilon-trimethyllysine
    - N6,N6,N6-trimethyllysine cation
    - n-trimethyllysine
    - N6,N6,N6-trimethyllysin-N6-ium
    - (5S)-5-amino-5-carboxy-N,N,N-trimethylpentan-1-aminium
    - '[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]-trimethyl-azanium'
    identifiers:
    - ns: resid
      id: AA0074
    - ns: chebi
      id: CHEBI:61961
    - ns: pdb-ccd
      id: M3L
    - ns: cas
      id: 19253-88-4
    - ns: go
      id: GO:0018023
    - ns: pdb.ligand
      id: M3L
    - ns: mod
      id: MOD:00083
    structure: OC(=O)[C@H](CCCC[N](C)(C)C)N
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0524:
    id: AA0524
    name: N6-chloro-L-lysine
    comments: 'In tryptophan 7-halogenase (EC 1.14.14.7), the modification is formed
      by autocatalysis as an intermediate in the catalytic cycle. The formation by
      myeloperoxidase (EC 1.11.1.7) is probably not a normal metabolic process. Generating
      Enzyme: autocatalytic; myeloperoxidase (EC 1.11.1.7).'
    synonyms:
    - lysine chloramine
    - N(zeta)-chlorolysine
    - (2S)-2-amino-6-(chloroamino)hexanoic acid
    - epsilon-chlorolysine
    identifiers:
    - ns: mod
      id: MOD:01670
    - ns: resid
      id: AA0524
    structure: ClNCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0205:
    id: AA0205
    name: L-cysteine sulfenic acid
    comments: This reactive residue must be stabilized by the protein structure. As
      a active site it may be reduced to cysteine or cysteine anion and reoxidized
      during the reaction cycle. The "active site" feature is used if the stable form
      is the reduced cysteine; the "modified site" feature is used if the stable form
      is the oxidized cysteine sulfenic acid.
    synonyms:
    - S-hydroxycysteine
    - 3-sulfenoalanine
    - (2R)-2-amino-3-hydroxysulfanyl-propanoic acid
    - 2-amino-3-sulfinylpropanoic acid [tautomer]
    - 2-amino-2-carboxyethanesulfenic acid
    - S-oxocysteine [tautomer]
    - (2R)-2-amino-3-(oxido-lambda(4)-sulfanyl)propanoic acid [tautomer]
    - cysteine S-oxide [tautomer]
    - C
    - S-oxycysteine [tautomer]
    - (2R)-2-amino-3-(hydroxysulfanyl)propanoic acid
    - S-hydroxy-L-cysteine
    - s-hydroxycysteine
    - cysteine sulfoxide [tautomer]
    - cysteine sulphenic acid
    identifiers:
    - ns: resid
      id: AA0205
    - ns: go
      id: GO:0018171
    - ns: chebi
      id: CHEBI:61962
    - ns: cas
      id: 5722-80-5
    - ns: mod
      id: MOD:00210
    - ns: pdb.ligand
      id: CSO
    - ns: pdb-ccd
      id: CSO
    structure: OSC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0216:
    id: AA0216
    name: N-(L-isoaspartyl)-L-cysteine
    synonyms:
    - (S)-2-amino-4-((R)-1-carboxy-2-sulfanylethyl)amino-4-oxobutanoic acid
    - N-isoaspartyl cysteine
    - 2-(3-amino-3-carboxypropanoyl)amino-3-mercaptopropanoic acid
    - N-beta-aspartylcysteine
    - 2-amino-N4-(1-carboxy-2-mercaptoethyl)butanediamic acid
    identifiers:
    - ns: mod
      id: MOD:00221
    - ns: go
      id: GO:0018263
    - ns: resid
      id: AA0216
    structure: SC[C@@H](C(=O)O)NC(=O)C[C@@H](C=O)N
    base_monomers:
    - N
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0556:
    id: AA0556
    name: L-cysteine sulfonic acid
    comments: This modification is easily produced artifactually. Cysteine sulfinic
      acid (see RESID:AA0262) exposed to air oxidizes to cysteic acid.
    synonyms:
    - 2-amino-2-carboxyethanesulfonic acid
    - (2R)-2-azanyl-3-sulfo-propanoic acid
    - (2R)-2-amino-3-sulfopropanoic acid
    - 3-sulfoalanine
    - 3-sulfo-L-alanine
    - C
    - cysteine sulphonic acid
    - 2-azanyl-3-sulfopropanoic acid
    - cysteic acid
    - cysteinesulfonic acid
    identifiers:
    - ns: cas
      id: 498-40-8
    - ns: resid
      id: AA0556
    - ns: chebi
      id: CHEBI:17285
    - ns: pdb-ccd
      id: OCS
    - ns: pdb.ligand
      id: OCS
    - ns: mod
      id: MOD:00460
    structure: OC(=O)[C@H](CS(O)(O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  K, K, K, K:
    id: AA0588
    name: Isodesmosine
    comments: 'After the oxidation of three of the four lysines to allysine (see RESID:AA0121),
      this cross-link forms spontaneously with a Schiff-base reaction, and a series
      of one aldimine and two aldol condensation reactions. In this aleatoric modification
      up to four peptide chains may be crosslinked, with each peptide contributing
      a lysine potentially in any of the four biosynthetic positions. Desmosine is
      a structural isomer (see RESID:AA0587). Up to two of the lysines forming the
      cross-link may also be hydroxylated and glycosylated (see RESID:AA0028 and RESID:AA0153).
      Generating Enzyme: lysyl oxidase (EC 1.4.3.13).'
    synonyms:
    - 6-[2-(4-amino-4-carboxybutyl)-3,5-bis(3-amino-3-carboxypropyl)pyridinio]norleucine
    - 2-[(4S)-4-amino-4-carboxybutyl]-1-[(5S)-5-amino-5-carboxypentyl]-3,5-bis[(3S)-3-amino-3-carboxypropyl]pyridinium
    identifiers:
    - ns: chebi
      id: CHEBI:64366
    - ns: cas
      id: 991-01-5
    - ns: mod
      id: MOD:01934
    - ns: resid
      id: AA0588
    structure: O=C[C@H](CCCC[NH+]1C=C(CC[C@@H](C(=O)O)[NH3+])CC(=C1CCC[C@@H](C=O)[NH3+])CC[C@@H](C=O)[NH3+])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0446:
    id: AA0446
    name: (2S,4S)-4,5-dihydroxyleucine
    synonyms:
    - (2s,4s)-2-amino-4,5-dihydroxy-4-methylpentanoic acid
    - (2S,4S)-2-amino-4,5-dihydroxy-4-methylpentanoic acid (non-preferred name)
    - gamma,delta-dihydroxyleucine
    - (2~{S},4~{S})-2-azanyl-4-methyl-4,5-bis(oxidanyl)pentanoic acid
    - (4S)-4,5-dihydroxyleucine
    - (2S,4S)-2-amino-4,5-dihydroxy-4-methylpentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: G5G
    - ns: mod
      id: MOD:01432
    - ns: resid
      id: AA0446
    structure: OC[C@](C[C@@H](C(=O)O)[NH3+])(O)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0589:
    id: AA0589
    name: O-glucosyl-L-hydroxylysine
    comments: 'The mimivirus enzyme is bifunctional and carries out both hydroxylation
      and glucosylation. Neither the regiospecificity nor stereospecificity of the
      hydroxylation, nor the anomeric specificity of the glucosylation have been determined.
      The 5-hydroxy, beta anomeric form is shown. Generating Enzyme: lysine dioxygenase
      (EC 1.14.11.-); hydroxylysine glucosyltransferase (EC 2.4.1.-).'
    synonyms:
    - (D-glucopyranosyl)oxy-L-lysine
    identifiers:
    - ns: mod
      id: MOD:01935
    - ns: resid
      id: AA0589
    structure: OC[C@H]1O[C@@H](O[C@H](CC[C@@H](C(=O)O)[NH3+])C[NH3+])[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  G, M:
    id: AA0379
    name: 2-imino-methionine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a methionine, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N, and the loss of a molecule of water. This
      cross-link is accompanied by modification of residue N+1. The modified residue
      N+1 is presented in a separate entry and is not included in the mass accounting
      of this entry. The backbone atoms of residue N+1 are shown in gray in the diagram.
      In the asFP595 chromoprotein, the peptide chain is cleaved at the methionine
      alpha-amino. For a previously proposed structure of the asFP595 chromoprotein,
      see RESID:AA0377. Generating Enzyme: autocatalytic.'
    synonyms:
    - 2,N-didehydromethionyl-5-imidazolinone glycine
    - 2-[1-imino-3-(methylsulfanyl)propyl]-1-carboxymethyl-1-imidazolin-5-one
    - GFP-like chromoprotein asFP595 chromophore
    - (2-[3-(methylsulfanyl)propanimidoyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic
      acid
    - MYG
    - 2-[(4Z)-4-[(4-hydroxyphenyl)methylidene]-2-(3-methylsulfanylpropanimidoyl)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - red fluorescent protein eqFP611 chromophore
    - '{(4Z)-4-[(4-hydroxyphenyl)methylidene]-2-[(1Z)-3-(methylsulfanyl)propanimidoyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - '{(4z)-4-(4-hydroxybenzylidene)-2-[3-(methylthio)propanimidoyl]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    - (2-[1-imino-3-(methylsulfanyl)propyl]-5-oxo-4,5-dihydro-imidazol-1-yl)acetic
      acid
    - 2-imino-methionyl-5-imidazolinone glycine
    identifiers:
    - ns: go
      id: GO:0051359
    - ns: mod
      id: MOD:00384
    - ns: pdb.ligand
      id: NRQ
    - ns: pdb-ccd
      id: NRQ
    - ns: resid
      id: AA0379
    structure: CSCCC(=N)C1=NCC(=O)N1CC(=O)O
    base_monomers:
    - M
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
  AA0033:
    id: AA0033
    name: L-aspartic 4-phosphoric anhydride
    synonyms:
    - 2-aminobutanedioic 4-phosphoric anhydride
    - D
    - 4-oxo-O-phosphono-L-homoserine
    - 2-azanyl-4-oxo-4-(phosphonooxy)butanoic acid
    - 4-phosphoaspartic acid
    - aspartyl phosphate
    - beta-aspartyl phosphate
    - (2S)-2-amino-4-oxo-4-phosphonooxy-butanoic acid
    - (2S)-2-amino-4-oxo-4-(phosphonooxy)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:00042
    - ns: go
      id: GO:0018443
    - ns: pdb-ccd
      id: PHD
    - ns: resid
      id: AA0033
    - ns: cas
      id: 22138-53-0
    - ns: pdb.ligand
      id: PHD
    - ns: chebi
      id: CHEBI:15836
    structure: O=C(OP(=O)([O-])[O-])C[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0403:
    id: AA0403
    name: O-mannosyl-L-threonine
    comments: 'See also RESID:AA0155, RESID:AA0247, RESID:AA0399, RESID:AA0401, RESID:AA0405,
      and RESID:AA0515 for other O-glycosylated threonines. Generating Enzyme: dolichyl-phosphate-mannose-protein
      mannosyltransferase (EC 2.4.1.109).'
    synonyms:
    - O-glycosylthreonine
    - O3-mannosylthreonine
    - (2S,3R)-2-amino-3-(alpha-D-mannopyranosyloxy)butanoic acid
    identifiers:
    - ns: resid
      id: AA0403
    - ns: mod
      id: MOD:00811
    structure: OC[C@H]1O[C@H](O[C@@H]([C@@H](C(=O)O)[NH3+])C)[C@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0398:
    id: AA0398
    name: O-(N-acetylamino)glucosyl-L-serine
    comments: 'See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0400, RESID:AA0402, RESID:AA0404,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: [protein]-L-serine/L-threonine beta-N-acetyl-D-glucosaminyl-transferase
      (EC 2.4.1.-).'
    synonyms:
    - (2S)-2-amino-3-(2-acetamido-2-deoxy-beta-D-glucopyranosyloxy)propanoic acid
    - O3-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-L-serine
    - O-(N-acetylglucosaminyl)serine
    - O3-(N-acetylglucosaminyl)serine
    - O-(2-acetylamino-2-deoxy-beta-D-glucopyranosyl)-L-serine
    - O-glycosylserine
    - O-seryl-beta-N-acetylglucosaminide
    identifiers:
    - ns: pdb.ligand
      id: NAG
    - ns: mod
      id: MOD:00805
    - ns: cas
      id: 10036-64-3
    - ns: resid
      id: AA0398
    structure: OC[C@H]1O[C@@H](OC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0465:
    id: AA0465
    name: 1-amino-2-propanol
    synonyms:
    - 2-hydroxy-1-propylamine
    - (2R)-1-aminopropan-2-ol
    - alpha-aminoisopropyl alcohol
    - 1-methyl-2-aminoethanol
    - decarboxylated threonine
    - 2-amino-1-methylethanol
    - isopropanolamine
    - 1-amino-2-hydroxypropane
    - 2-hydroxypropanamine
    - 2-hydroxypropylamine
    - threamine
    identifiers:
    - ns: cas
      id: 35320-23-1
    - ns: mod
      id: MOD:01388
    - ns: chebi
      id: CHEBI:15675
    - ns: resid
      id: AA0465
    structure: C[C@H](C[NH3+])O
    base_monomers:
    - T
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0549:
    id: AA0549
    name: 5'-chloro-L-tryptophan
    synonyms:
    - (2S)-2-amino-3-(5-chloro-1H-indol-3-yl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0549
    - ns: mod
      id: MOD:01843
    - ns: cas
      id: 33468-35-8
    structure: OC(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc(Cl)cc2
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0612:
    id: AA0612
    name: 5-glutamyl N2-glutamate
    comments: 'This entry is for isoglutamyl glutamic acid where there is a single
      glutamic acid attached to a peptide glutamyl residue by an isopeptide bond.
      For L-isoglutamyl-polyglutamic acid where there are 2 to 6 alpha-peptide linked
      glutamic acid residues attached to a peptide glutamyl residue by an isopeptide
      bond, see RESID:AA0202. Generating Enzyme: glutamate--LysW ligase, ArgX (EC
      6.3.2.-).'
    synonyms:
    - gamma-glutamylglutamate
    - 2-([4-azanyl-4-carboxybutanoyl]azanyl)pentanedioic acid
    - (2S)-2-[(4S)-4-amino-4-carboxybutanamido]pentanedioic acid
    - isoglutamyl glutamic acid
    - (2S)-2-([(4S)-4-amino-4-carboxybutanoyl]amino)pentanedioic acid
    - isoglutamyl monoglutamic acid
    - N-(gamma-L-glutamyl)-L-glutamic acid
    identifiers:
    - ns: resid
      id: AA0612
    - ns: cas
      id: 1116-22-9
    - ns: mod
      id: MOD:01970
    structure: O=C[C@H](CCC(=O)N[C@H](C(=O)[O-])CCC(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0230:
    id: AA0230
    name: S-nitrosyl-L-cysteine
    comments: 'The reaction of nitrosonium (NO+) with cysteine residues may not be
      enzymatically catalyzed; the reaction of a cysteine residue with, or the reductive
      production of, nitric oxide (NO) has not been clarified. Generating Enzyme:
      autocatalytic; peptidyl-cysteine S-nitrosyltransferase (EC 2.6.99.-).'
    synonyms:
    - (2R)-2-amino-3-nitrososulfanyl-propanoic acid
    - s-nitroso-cysteine
    - C
    - S-nitrosocysteine
    - S-nitroso-L-cysteine
    - L-cysteine nitrite ester
    identifiers:
    - ns: pdb-ccd
      id: SNC
    - ns: mod
      id: MOD:00235
    - ns: resid
      id: AA0230
    - ns: cas
      id: 51209-75-7
    - ns: go
      id: GO:0018119
    structure: O=NSC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0571:
    id: AA0571
    name: L-cysteine 5-methyloxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-threonine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1R)-1-azanyl-2-sulfanylethyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    - 2-[(1R)-1-amino-2-sulfanylethyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01900
    - ns: resid
      id: AA0571
    structure: SC[C@@H](c1oc(c(n1)C(=O)O)C)N
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0235:
    id: AA0235
    name: 4-hydroxy-L-lysine
    comments: 5-Hydroxy-L-lysine (see RESID:AA0028) was found at a homologous position
      in the closely related species Rhodomonas CS24. See also RESID:AA0370. The (2S,4R)
      diastereomer is shown.
    synonyms:
    - alpha,epsilon-diamino-gamma-hydroxycaproic acid
    - (2S,4R)-2,6-diamino-4-hydroxyhexanoic acid
    - L-threo-gamma-hydroxylysine
    identifiers:
    - ns: go
      id: GO:0018396
    - ns: mod
      id: MOD:00240
    - ns: cas
      id: 60594-62-9
    - ns: resid
      id: AA0235
    structure: O[C@H](CC[NH3+])C[C@H]([NH3+])C(=O)O
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0457:
    id: AA0457
    name: L-cystine S-oxide
    comments: This modification in the modeled protein has not been chemically confirmed.
    synonyms:
    - S-[(2R)-2-amino-3-oxopropyl] (2R)-2-amino-3-oxopropane-1-sulfinothioate
    - cystine sulfoxide
    - (2R)-2-amino-3-[([(2R)-2-amino-2-carboxyethyl]sulfanyl)sulfinyl]propanoic acid
    - S-cysteinyl 3-(oxidosulfanyl)alanine
    identifiers:
    - ns: mod
      id: MOD:01383
    - ns: resid
      id: AA0457
    structure: O=C[C@H](CS[S@@](=O)C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  C, G:
    id: AA0188
    name: L-cysteine 5-imidazolinone glycine
    comments: This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a cysteine, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N+1 which loses one hydrogen, and the loss of
      a molecule of water. This cross-link is accompanied by modification of residue
      N+1. The modification of serine to dehydroalanine coupled with the formation
      of 5-imidazolinone by the two neighboring residues produces the 4-methylidene-imidazole-5-one
      (MIO) active site of some amino acid ammonia-lyases that differs by UV and mass
      spectrometric evidence from other known dehydroalanine containing peptides not
      containing the second modification.
    synonyms:
    - (2-[(1R)-1-amino-2-sulfanylethyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic
      acid
    - cysteinyl-5-imidazolinone glycine
    - '[(4Z)-2-[(1R)-1-amino-2-sulfanylethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - '[(4z)-2-[(1r)-1-amino-2-mercaptoethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    - 2-[(4Z)-2-[(1R)-1-azanyl-2-sulfanyl-ethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-[1-amino-2-sulfanylethyl]-1-carboxymethyl-1-imidazolin-5-one
    - 4-methylidene-imidazole-5-one (MIO) active site
    - CYG
    identifiers:
    - ns: resid
      id: AA0188
    - ns: mod
      id: MOD:00196
    - ns: pdb-ccd
      id: GYC
    - ns: go
      id: GO:0018253
    - ns: pdb.ligand
      id: GYC
    structure: OC(=O)CN1C(=NCC1=O)[C@@H]([NH3+])CS
    base_monomers:
    - C
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0038:
    id: AA0038
    name: O-phospho-L-threonine
    comments: 'Generating Enzyme: protein-threonine kinase (EC 2.7.1.37).'
    synonyms:
    - (2S,3R)-2-amino-3-(phosphonooxy)butanoic acid
    - 2-azanyl-3-(phosphonooxy)butanoic acid
    - (2S,3R)-2-amino-3-phosphonooxy-butanoic acid
    - T
    - threonine phosphate ester
    - 2-amino-3-hydroxybutanoic acid 3-phosphate
    - O-phosphono-L-threonine
    - O3-phosphothreonine
    - phosphothreonine
    identifiers:
    - ns: resid
      id: AA0038
    - ns: go
      id: GO:0018107
    - ns: pdb-ccd
      id: TPO
    - ns: chebi
      id: CHEBI:61971
    - ns: mod
      id: MOD:00047
    - ns: pdb.ligand
      id: TPO
    - ns: cas
      id: 1114-81-4
    structure: OC(=O)[C@H]([C@H](OP(=O)([O-])[O-])C)[NH3+]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0542:
    id: AA0542
    name: 2'-hydroxy-L-tryptophan
    comments: This modification may be produced artifactually.
    synonyms:
    - 2-azanyl-3-(2-hydroxy-1H-indol-3-yl)propanoic acid
    - (2S)-2-amino-3-(2-hydroxy-1H-indol-3-yl)propanoic acid
    - 2-hydroxy-tryptophan
    - 2-hydroxy-L-tryptophan
    identifiers:
    - ns: pdb.ligand
      id: TRO
    - ns: resid
      id: AA0542
    - ns: mod
      id: MOD:01816
    structure: OC(=O)[C@H](Cc1c(O)[nH]c2c1cccc2)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0447:
    id: AA0447
    name: (2S,3S,4R)-3,4-dihydroxyisoleucine
    comments: In some cases the stereochemistry for the second and third chiral centers
      have not been resolved.
    synonyms:
    - (2s,3s,4r)-2-amino-3,4-dihydroxy-3-methylpentanoic acid
    - I
    - beta,gamma-dihydroxyisoleucine
    - (2S,3S,4R)-2-azanyl-3,4-dihydroxy-3-methyl-pentanoic acid
    - (2S,3S,4R)-2-amino-3,4-dihydroxy-3-methylpentanoic acid (non-preferred name)
    - (2S,3S,4R)-2-amino-3,4-dihydroxy-3-methylpentanoic acid
    - (3S,4R)-3,4-dihydroxyisoleucine
    identifiers:
    - ns: pdb.ligand
      id: TSI
    - ns: resid
      id: AA0447
    - ns: pdb-ccd
      id: TS9
    - ns: mod
      id: MOD:01376
    structure: OC[C@H]([C@@]([C@H](O)C)(O)C)[NH3+]
    base_monomers:
    - I
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0109:
    id: AA0109
    name: 2'-(S-L-cysteinyl)-L-histidine
    comments: Cysteinylhistidine probably does not have a functional role in the enzymatic
      activity of Neurospora crassa tyrosinase.
    synonyms:
    - (2S)-2-amino-3-[2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-1H-imidazol-4-yl]propanoic
      acid
    - (2R)-2-amino-3-[(4-[(2S)-2-amino-2-carboxyethyl]-1H-imidazol-2-yl)sulfanyl]propanoic
      acid
    - S-(2'-histidyl)cysteine
    identifiers:
    - ns: mod
      id: MOD:00118
    - ns: go
      id: GO:0018233
    - ns: resid
      id: AA0109
    - ns: cas
      id: 77504-36-0
    structure: O=C[C@H](CSc1ncc([nH]1)C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - C
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  AA0483:
    id: AA0483
    name: L-threonine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[1-azanyl-2-hydroxypropyl]-1,3-thiazole-4-carboxylic acid
    - 2-[(1S,2R)-1-amino-2-hydroxypropyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01406
    - ns: resid
      id: AA0483
    - ns: pdb.ligand
      id: XAA
    structure: C[C@H]([C@@H](c1scc(n1)C(=O)O)[NH3+])O
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
  AA0237:
    id: AA0237
    name: O-(ADP-ribosyl)-L-serine
    comments: 'It is not known whether botulinum exoenzyme C3 catalyzes formation
      of the alpha or beta isomer. The alpha form is presented. The keyword "phosphoprotein"
      is not used with toxin modification. Generating Enzyme: NAD(P)+--serine ADP-ribosyltransferase
      (EC 2.4.2.-).'
    synonyms:
    - O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-serine
    - (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-propanoic
      acid
    - O3-alpha-D-ribofuranosyl-L-serine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    - O3-(ADP-ribosyl)-L-serine
    identifiers:
    - ns: go
      id: GO:0006471
    - ns: resid
      id: AA0237
    - ns: mod
      id: MOD:00242
    structure: OC(=O)[C@H](CO[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 51
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 51
    - molecule: Monomer
      element: H
      position: 51
      charge: 1
  AA0346:
    id: AA0346
    name: N-glycyl-1-(phosphatidyl)ethanolamine
    comments: A representative phospholipid structure is shown. Cleavage of a carboxyl
      terminal propeptide accompanies transamidation.
    synonyms:
    - N-glycyl-1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine
    - (R)-1-hexadecanoyloxy-2-((Z)-9-octadecenoyloxy)-3-[2-(aminoacetylamino)ethyloxyphospho]propane
    identifiers:
    - ns: resid
      id: AA0346
    - ns: mod
      id: MOD:00351
    - ns: go
      id: GO:0050495
    structure: CCCCCCCCCCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC/C=C\CCCCCCCC)CO[P@@](=O)(OCCNC(=O)C[NH3+])[O-]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 49
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 49
  AA0064:
    id: AA0064
    name: N-methyl-L-methionine
    comments: 'Polypeptides with monomethylated amino terminals can undergo premature
      cleavage during the coupling step of an Edman degradation. This can result in
      "preview" with both a residue and the following residue being seen from the
      first step on through a sequence. Although appropriate, the keyword "thioether
      bond" normally does not appear for this amino acid. Generating Enzyme: S-adenosylmethionine--methionyl-peptide
      N-methyltransferase (EC 2.1.1.-).'
    synonyms:
    - (2S)-2-methylamino-4-(methylsulfanyl)butanoic acid
    - n-methyl methionine
    - M
    - N-methyl-L-methionine
    - 2-methylamino-4-(methylthio)butanoic acid
    - (2S)-2-methylamino-4-methylsulfanyl-butanoic acid
    - N-methylmethionine
    identifiers:
    - ns: go
      id: GO:0018014
    - ns: cas
      id: 42537-72-4
    - ns: pdb-ccd
      id: MME
    - ns: pdb.ligand
      id: MME
    - ns: resid
      id: AA0064
    - ns: chebi
      id: CHEBI:61886
    - ns: mod
      id: MOD:00073
    structure: CSCC[C@@H](C(=O)O)[NH2+]C
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0385:
    id: AA0385
    name: O-decanoyl-L-serine
    comments: 'Generating Enzyme: ghrelin O-acyltransferase, GOAT (EC 2.3.1.-).'
    synonyms:
    - L-serine decanoate ester
    - (2S)-2-amino-3-(decanoyloxy)propanoic acid
    - O3-decanoyl-L-serine
    identifiers:
    - ns: mod
      id: MOD:00390
    - ns: resid
      id: AA0385
    - ns: go
      id: GO:0042050
    structure: CCCCCCCCCC(=O)OC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  AA0390:
    id: AA0390
    name: O4-(N-acetylamino)glucosyl-L-hydroxyproline
    comments: See also RESID:AA0212 and RESID:AA0389 for other O4-glycosylated 4-hydroxyprolines.
    synonyms:
    - 4-(N-acetylglucosaminyloxy)proline
    - (2S,4R)-4-[2-acetamido-2-deoxy-alpha-D-glucopyranosyloxy]pyrrolidine-2-carboxylic
      acid
    - 4-[(2-N-acetylamino)-alpha-D-glucopyranosyl]oxyproline
    - O4-glycosyl-hydroxyproline
    - alpha-2-(N-acetylamino)glucopyranosyl-4-hydroxyproline
    identifiers:
    - ns: resid
      id: AA0390
    - ns: cas
      id: 10036-64-3
    - ns: mod
      id: MOD:00758
    structure: OC[C@H]1O[C@H](O[C@H]2C[NH2+][C@@H](C2)C(=O)O)[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  E, Y:
    id: AA0283
    name: pyrroloquinoline quinone
    comments: In some prokaryotes, the pqqA protein is the origin of pyrroloquinoline
      quinone. In other organisms the endogenous source, if there is one, has not
      been established.
    synonyms:
    - 4,5-dihydro-4,5-dioxo-1H-pyrrolo[2,3-5,6]quinoline-2,7,9-tricarboxylic acid
    - 2,7,9-tricarboxy-1H-pyrrolo(2,3-f)quinoline-4,5-dione
    - coenzyme PQQ
    - methoxatin
    - 2,4,6-tricarboxylic-pyrrolo[2,3-5,6]quinoline 8,9-quinone
    identifiers:
    - ns: resid
      id: AA0283
    - ns: pdb.ligand
      id: PQQ
    - ns: cas
      id: 72909-34-3
    - ns: chebi
      id: CHEBI:18315
    - ns: go
      id: GO:0018189
    - ns: mod
      id: MOD:00288
    structure: '[O-]C(=O)c1cc(nc2c1c1[nH]c(cc1C(=O)C2=O)C(=O)[O-])C(=O)[O-]'
    base_monomers:
    - E
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  AA0402:
    id: AA0402
    name: O-mannosyl-L-serine
    comments: 'See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0404,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: dolichyl-phosphate-mannose-protein mannosyltransferase (EC 2.4.1.109).'
    synonyms:
    - O-mannopyranosylserine
    - O3-mannosylserine
    - (2S)-2-amino-3-(alpha-D-mannopyranosyloxy)propanoic acid
    - O-glycosylserine
    identifiers:
    - ns: resid
      id: AA0402
    - ns: mod
      id: MOD:00810
    - ns: cas
      id: 78609-14-0
    structure: OC[C@H]1O[C@H](OC[C@@H](C(=O)O)[NH3+])[C@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0145:
    id: AA0145
    name: O4'-(8alpha-FAD)-L-tyrosine
    comments: 'The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-amino-3-(4-[8alpha-riboflavin 5'-(trihydrogen diphosphate) 5'->5'-ester
      with adenosine]oxyphenyl)propanoic acid
    - 8alpha-(O4'-tyrosyl)FAD
    identifiers:
    - ns: go
      id: GO:0018296
    - ns: pdb.ligand
      id: FAD
    - ns: resid
      id: AA0145
    - ns: mod
      id: MOD:00154
    structure: O=C1[N-]C(=O)C2C(N1)N(C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc3c1ncnc3N)[O-])[O-])O)O)O)C1C(N2)CC(C(C1)COc1ccc(cc1)C[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 70
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 73
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 72
    - molecule: Monomer
      element: H
      position: 72
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 73
    - molecule: Monomer
      element: H
      position: 73
      charge: 1
  AA0476:
    id: AA0476
    name: N6-(ADP-ribosyl)-L-lysine
    comments: 'The alpha form is presented. The keyword "phosphoprotein" is not used
      with ADP-ribosylation. Generating Enzyme: NAD(P)+--lysine ADP-ribosyltransferase
      (EC 2.4.2.-).'
    synonyms:
    - N6-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-lysine
    - 2-amino-6-(ADP-ribosyl)amino-hexanoic acid
    - epsilon-ADP-ribosyllysine
    - (S)-2-amino-6-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]amino)hexanoic
      acid
    - N(zeta)-ADP-ribosyllysine
    - N6-alpha-D-ribofuranosyl-L-lysine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    identifiers:
    - ns: mod
      id: MOD:01399
    - ns: resid
      id: AA0476
    structure: OC(=O)[C@H](CCCC[NH2+][C@H]1O[C@@H]([C@H]([C@H]1O)O)CO[P@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-])[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 57
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 57
    - molecule: Monomer
      element: H
      position: 57
      charge: 1
  AA0153:
    id: AA0153
    name: O5-glucosylgalactosyl-L-hydroxylysine
    comments: 'Some forms of lysyl hydroxylase (EC 1.14.11.4) are multifunctional
      and possess both transferase activities. Generating Enzyme: procollagen galactosyltransferase
      (EC 2.4.1.50); procollagen glucosyltransferase (EC 2.4.1.66).'
    synonyms:
    - (2S,5R)-2,6-diamino-5-[2-O-(alpha-D-glucopyranosyl)-beta-D-galactopyranosyloxy]hexanoic
      acid
    - 5-(2-O-alpha-D-glucopyranosyl-beta-D-galactopyranosyl)oxy-L-lysine
    identifiers:
    - ns: go
      id: GO:0006493
    - ns: resid
      id: AA0153
    - ns: cas
      id: 32448-35-4
    - ns: mod
      id: MOD:00162
    structure: OC[C@H]1O[C@@H](O[C@H](CC[C@@H](C(=O)O)[NH3+])C[NH3+])[C@@H]([C@H]([C@H]1O)O)O[C@H]1O[C@H](CO)[C@H]([C@@H]([C@H]1O)O)O
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0594:
    id: AA0594
    name: labionine
    comments: This three residue cross-link modification includes both a thioether
      bond and an alpha-linked carbon-carbon bond.
    synonyms:
    - (2S,4S)-2,4-diamino-2-[([(2R)-2-amino-2-carboxyethyl]sulfanyl)methyl]pentanedioic
      acid
    - (2S,4S,8R)-labionin
    - (2S,4S,8R)-2,4,8-triamino-4-carboxy-6-thianonanedioic acid
    identifiers:
    - ns: mod
      id: MOD:01948
    - ns: resid
      id: AA0594
    structure: O=C[C@H](CSC[C@](C[C@@H](C(=O)O)[NH3+])(C=O)N)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0434:
    id: AA0434
    name: hydroxyglycine
    comments: The S form, produced by peptidylglycine alpha-hydroxylating monooxygenase,
      is shown.
    synonyms:
    - aminohydroxyacetic acid
    - amino(hydroxy)acetic acid
    - alpha-hydroxyglycine
    identifiers:
    - ns: chebi
      id: CHEBI:38048
    - ns: mod
      id: MOD:01180
    - ns: resid
      id: AA0434
    - ns: cas
      id: 4746-62-7
    structure: OC(=O)[C@H](O)N
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  AA0531:
    id: AA0531
    name: 5-hydroxy-N6-(beta-lysyl)-L-lysine
    comments: 'This modification is produced from N6-acylation of lysine by a lysyl-adenylate.
      However, evidence on whether alpha- or beta-lysyl adenylate is used, and the
      intermediates on the pathway appears to be in conflict (see RESID:AA0530). The
      modified lysine residue is homologous to the lysine modified to hypusine in
      eukaryotic and archaeal translation initiation factor 5A. The structure of this
      modification has not been established. The original proposed structure was not
      hydroxylated. Neither the location of the hydroxyl, shown as a 5-hydroxy, or
      its stereochemistry is known. Generating Enzyme: translation elongation factor
      P-lysine 2,3-aminomutase YjeK (EC 5.4.3.-); translation elongation factor P-lysine
      monooxygenase YfcM (EC 1.14.99.-).'
    synonyms:
    - lysyl spermidine derivative [misidentification]
    - (2S)-2-amino-6-([(3R)-3,6-diaminohexanoyl]amino)-5-hydroxyhexanoic acid
    - EF-P lysine derivative
    - N6-[(3R)-3,6-diaminohexanoyl]-L-5-hydroxylysine
    - 5-hydroxy-N6-[(3R)-beta-lysyl]lysine
    identifiers:
    - ns: mod
      id: MOD:01780
    - ns: go
      id: GO:0072580
    - ns: resid
      id: AA0531
    structure: '[NH3+]CCC[C@@H](CC(=O)NC[C@@H](CC[C@@H](C(=O)O)[NH3+])O)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  AA0320:
    id: AA0320
    name: L-beta-methylthioasparagine
    comments: There is a second chiral center. The (2R,3R) form is shown. This modification
      was predicted for ribosomal protein S12 in Bacillus subtilis when the sequence
      in the original version of the genome was reported to have asparagine rather
      than aspartic acid at the position of the methylthioaspartic acid modification
      (see RESID:AA0232). Two groups independently confirmed that the genome sequence
      was erroroneous. The sequence in the revised genome has aspartic acid at that
      position.
    synonyms:
    - 3-carboxamido-S-methyl-cysteine
    - beta-(methylthio)asparagine
    - (2R,3Xi)-2-amino-3-(methylsulfanyl)-4-butanediamic acid
    - 2,4-diamino-3-(methylsulfanyl)-4-oxobutanoic acid
    identifiers:
    - ns: resid
      id: AA0320
    - ns: mod
      id: MOD:00325
    - ns: go
      id: GO:0042259
    structure: CS[C@H]([C@@H](C(=O)O)N)C(=O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  H, Y:
    id: AA0270
    name: 3'-(1'-L-histidyl)-L-tyrosine
    comments: This modification is different from the modification 3-(3'-L-histidyl)-L-tyrosine,
      see RESID:AA0250.
    synonyms:
    - (2S)-2-amino-3-[1-(5-[(2S)-2-amino-2-carboxyethyl]-2-hydroxyphenyl)-1H-imidazol-4-yl]propanoic
      acid
    - 3'-(tele-histidyl)tyrosine
    - 3'-(tau-histidyl)tyrosine
    - 3'-(N(epsilon)-histidyl)tyrosine
    - 3'-(N1'-histidyl)tyrosine
    identifiers:
    - ns: chebi
      id: CHEBI:19837
    - ns: mod
      id: MOD:00275
    - ns: go
      id: GO:0018152
    - ns: resid
      id: AA0270
    structure: O=C[C@H](Cc1ccc(c(c1)n1cnc(c1)C[C@@H](C(=O)O)[NH3+])O)[NH3+]
    base_monomers:
    - Y
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  AA0471:
    id: AA0471
    name: cysteine-5-amino-3,4,5,6-tetrahydropyridine-2,5-dicarboxylic acid
    comments: Formed by the metathesis of two didehydroalanines made from serines,
      condensation with a cysteine carbonyl and dehydrogenation.
    synonyms:
    - (5R,6R)-5-amino-6-[(1R)-1-amino-2-sulfanylethyl]-3,4,5,6-tetrahydropyridine-2,5-dicarboxylic
      acid
    - L-cysteine 5-aminopiperideine-2,5-dicarboxylic acid
    identifiers:
    - ns: resid
      id: AA0471
    - ns: mod
      id: MOD:01394
    - ns: pdb.ligand
      id: XBB
    structure: SC[C@@H]([C@H]1N=C(CC[C@]1(N)C=O)C(=O)O)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
  AA0116:
    id: AA0116
    name: N6-(4-amino-2-hydroxybutyl)-L-lysine
    comments: 'Hypusine appears to occur uniquely in translation initiation factor
      eIF-5A. For the detectable intermediate form, L-deoxyhypusine, in either deoxyhypusine
      synthase or in initiation factor 5A, eIF5A, see RESID:AA0564. It is highly probable
      that, like prokaryotic elongation factor EF-P, eIF-5A acts to relieve ribosome
      stalling during the translation of polyproline and prolylglycine sequences.
      The hypusine residue may extend into the ribosome active site and assist in
      catalysis of the petidyl transfer. Generating Enzyme: deoxyhypusine synthase
      (EC 2.5.1.46); deoxyhypusine monooxygenase (EC 1.14.99.29).'
    synonyms:
    - N6-(4-amino-2-hydroxybutyl)-L-lysine
    - (2S)-2-amino-6-([(2R)-4-amino-2-hydroxybutyl]amino)hexanoic acid
    - (2S,9R)-2,11-diazanyl-9-hydroxy-7-azaundecanoic acid
    - (2S,9R)-hypusine
    - 2-azanyl-6-[(4-azanyl-2-hydroxybutyl)azanyl]hexanoic acid
    identifiers:
    - ns: mod
      id: MOD:00125
    - ns: go
      id: GO:0008612
    - ns: chebi
      id: CHEBI:21858
    - ns: resid
      id: AA0116
    - ns: cas
      id: 34994-11-1
    structure: '[NH3+]CC[C@H](C[NH2+]CCCC[C@@H](C(=O)O)[NH3+])O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  AA0568:
    id: AA0568
    name: N6-malonyl-L-lysine
    comments: The responsible generating enzyme activity is not identified. This modification
      can be reversed by Sirt5.
    synonyms:
    - N6-(carboxyacetyl)lysine
    - N6-malonyllysine
    - N(epsilon)-(malonyl)lysine
    - malonyllysine
    - 2-azanyl-6-[(carboxyacetyl)azanyl]hexanoic acid
    - (2S)-2-amino-6-[(carboxyacetyl)amino]hexanoic acid
    identifiers:
    - ns: go
      id: GO:0044392
    - ns: mod
      id: MOD:01893
    - ns: resid
      id: AA0568
    structure: O=C[C@H](CCCCNC(=O)CC(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0223:
    id: AA0223
    name: S-diphytanylglycerol diether-L-cysteine
    comments: The stereochemistry of the glycerol has not been determined. The S form
      is shown.
    synonyms:
    - (2R)-2-amino-3-([(2S)-2,3-bis(3,7,11,15-tetramethylhexadecanyloxy)propyl]sulfanyl)propanoic
      acid
    - S-[2',3'-bis(phytanyloxy)propyl]cysteine
    - S-archaeol cysteine
    identifiers:
    - ns: resid
      id: AA0223
    - ns: mod
      id: MOD:00228
    - ns: go
      id: GO:0018115
    structure: C[C@H](CCC[C@@H](CCC[C@@H](CCCC(C)C)C)C)CCOC[C@@H](CSC[C@@H](C(=O)O)[NH3+])OCC[C@@H](CCC[C@@H](CCC[C@@H](CCCC(C)C)C)C)C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 33
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 36
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 35
    - molecule: Monomer
      element: H
      position: 35
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 36
    - molecule: Monomer
      element: H
      position: 36
      charge: 1
  AA0407:
    id: AA0407
    name: S-stearoyl-L-cysteine
    comments: 'Although the predominant palmitoyl transferase in mammalian systems
      appears to utilize a mixture of saturated and unsaturated fatty acids, some
      systems may be more specific in their incorporation of other fatty acids.  See
      RESID:AA0307 and RESID:AA0308. This modification may be misidentified as S-palmitoyl-cysteine
      (see RESID:AA0106) when labeled palmitate is used without determining whether
      metabolic conversion has occurred. Generating Enzyme: protein-cysteine S-stearoyltransferase
      (EC 2.3.1.-).'
    synonyms:
    - (R)-2-amino-3-(octadecanoylsulfanyl)propanoic acid
    - 2-amino-3-(octadecanoylthio)propanoic acid
    - cysteine octadecanoate thioester
    - cysteine stearate thioester
    identifiers:
    - ns: mod
      id: MOD:00816
    - ns: resid
      id: AA0407
    structure: CCCCCCCCCCCCCCCCCC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
    - molecule: Monomer
      element: H
      position: 26
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
  AA0509:
    id: AA0509
    name: 3'-iodo-L-tyrosine
    synonyms:
    - (2S)-2-amino-3-(4-hydroxy-3-iodophenyl)propanoic acid
    - 4-hydroxy-3-iodo-phenylalanine
    - MIT
    - 3-iodo-tyrosine
    - 3-iodo-L-tyrosine
    - (2S)-2-amino-3-(4-hydroxy-3-iodo-phenyl)propanoic acid
    - Y
    - 3-iodotyrosine
    identifiers:
    - ns: chebi
      id: CHEBI:27847
    - ns: pdb.ligand
      id: IYR
    - ns: resid
      id: AA0509
    - ns: cas
      id: 70-78-0
    - ns: mod
      id: MOD:01612
    - ns: pdb-ccd
      id: IYR
    structure: OC(=O)[C@H](Cc1ccc(c(c1)I)O)[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0445:
    id: AA0445
    name: (2S,4R)-4,5-dihydroxyleucine
    synonyms:
    - gamma,delta-dihydroxyleucine
    - (2S,4R)-2-amino-4,5-dihydroxy-4-methylpentanoic acid (non-preferred name)
    - (2s,4r)-2-amino-4,5-dihydroxy-4-methylpentanoic acid
    - (2S,4R)-2-amino-4,5-dihydroxy-4-methylpentanoic acid
    - (2~{S},4~{R})-2-azanyl-4-methyl-4,5-bis(oxidanyl)pentanoic acid
    - (4R)-4,5-dihydroxyleucine
    identifiers:
    - ns: mod
      id: MOD:01375
    - ns: resid
      id: AA0445
    - ns: pdb-ccd
      id: EEP
    structure: OC[C@@](C[C@@H](C(=O)O)[NH3+])(O)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  U:
    id: AA0022
    name: L-selenocysteine
    comments: 'Selenocysteine is translated for the UGA codon in some genetic systems.
      It has not yet been demonstrated to arise alternatively from a post-translational
      modification. Although the single letter symbol U is recommended by IUBMB, many
      software applications fail to recognize it, and some sequence databases may
      use the single letter symbol C. Generating Enzyme: serine--tRNA ligase (EC 6.1.1.11);
      L-seryl-tRNA(Sec) selenium transferase, SelA (EC 2.9.1.1); O-phosphoseryl-tRNA(Sec)
      kinase (EC 2.7.1.164); O-phospho-L-seryl-tRNA(Sec):L-selenocysteinyl-tRNA synthase,
      SepSecS (EC 2.9.1.2).'
    synonyms:
    - selenium cysteine
    - 2-azanyl-3-selanylpropanoic acid
    - 3-selenylalanine
    - (2R)-2-amino-3-selanylpropanoic acid
    - SeCys
    identifiers:
    - ns: mod
      id: MOD:00031
    - ns: chebi
      id: CHEBI:30000
    - ns: cas
      id: 10236-58-5
    - ns: resid
      id: AA0022
    - ns: go
      id: GO:0001514
    - ns: pdb.ligand
      id: CSE
    - ns: mod
      id: MOD:00686
    structure: N[C@H](C(=O)O)C[SeH]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0229:
    id: AA0229
    name: L-cysteine glutathione disulfide
    comments: Disulfide formation with free glutatione extracellularly is probably
      not enzymatically catalyzed.
    synonyms:
    - cysteinyl glutathione
    - L-gamma-glutamyl-L-cysteinyl-glycine (2-1')-disulfide with L-cysteine
    - N-(N-gamma-glutamyl-cystinyl)-glycine
    - (2S)-2-amino-3-((2S)-2-((4R)-4-amino-4-carboxyl-1-oxobutyl)amino-3-(carboxylmethyl)amino-3-oxo-propyl)dithio-propanoic
      acid
    identifiers:
    - ns: chebi
      id: CHEBI:21264
    - ns: go
      id: GO:0018118
    - ns: resid
      id: AA0229
    - ns: cas
      id: 13081-14-6
    - ns: mod
      id: MOD:00234
    - ns: pdb.ligand
      id: GSH
    structure: O=C[C@H](CSSC[C@@H](C(=O)NCC(=O)[O-])NC(=O)CC[C@@H](C(=O)[O-])[NH3+])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0426:
    id: AA0426
    name: S-(15-deoxy-Delta12,14-prostaglandin J2-9-yl)-L-cysteine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - (5Z,9Xi,12E,14Z)-9-([(2R)-2-amino-3-carboxyethyl]sulfanyl)-11-oxoprosta-5,12,14-trien-1-oic
      acid
    - (2R)-2-amino-3-([(5Z,9Xi,12E,14Z)-1-hydroxy-1,11-oxoprosta-5,12,14-trien-9-yl]sulfanyl)propanoic
      acid
    identifiers:
    - ns: cas
      id: 60203-57-8
    - ns: chebi
      id: CHEBI:27485
    - ns: mod
      id: MOD:01174
    - ns: resid
      id: AA0426
    structure: CCCCC/C=C\C=C/1\C(=O)C[C@H]([C@@H]1C/C=C\CCCC(=O)[O-])SC[C@@H](C=O)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 32
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    - molecule: Monomer
      element: H
      position: 32
      charge: 1
  AA0458:
    id: AA0458
    name: aminomalonic acid
    comments: This modification in the modeled protein has not been chemically confirmed.
      As a free amino acid, aminomalonic acid is achiral. However, originating from
      (2S)-serine in a protein, the residue would be named as a (2R)-2,3-diamino-3-oxopropanoic
      acid, with the serine carbon-3 carboxyl taking precedence, becoming carbon-1,
      and changing the stereochemical designation. The PDB Hetgroup FGL was originally
      designated as the "C(alpha)-formyl glycine" active site residue L-3-oxoalanine
      (see RESID:AA0185) observed in its hydrated form. That structure, a gem-diol
      with an sp(3) carbon, was misinterpreted as a carboxyl with an sp(2) carbon
      and assigned to aminomalonic acid instead.
    synonyms:
    - 2-carboxyglycine
    - aminopropanedioic acid
    - Ama
    identifiers:
    - ns: mod
      id: MOD:01384
    - ns: resid
      id: AA0458
    - ns: pdb.ligand
      id: FGL
    - ns: cas
      id: 1068-84-4
    structure: O=C[C@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0590:
    id: AA0590
    name: N6-oleoyl-L-lysine
    comments: 'Generating Enzyme: peptidyl-lysine N6-oleoyltransferase (EC 2.3.1.-).'
    synonyms:
    - N6-[(9Z)-1-oxo-9-octadecenyl]lysine
    - (2S)-2-amino-6-([(9Z)-octadec-9-enoyl]amino)hexanoic acid
    identifiers:
    - ns: cas
      id: 23499-75-4
    - ns: resid
      id: AA0590
    - ns: mod
      id: MOD:01936
    structure: CCCCCCCC/C=C\CCCCCCCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
    - molecule: Monomer
      element: H
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  AA0305:
    id: AA0305
    name: N5-methyl-L-arginine
    comments: 'This modification should not be confused with 5-methylarginine (see
      RESID:AA0272). Generating Enzyme: protein-arginine N5-methyltransferase (EC
      2.1.1.-).'
    synonyms:
    - (2S)-2-amino-5-(N-methylcarbamimidamido)pentanoic acid
    - N5-carbamimidoyl-N5-methyl-L-ornithine
    - delta-N-methylarginine
    identifiers:
    - ns: mod
      id: MOD:00310
    - ns: go
      id: GO:0019701
    - ns: resid
      id: AA0305
    - ns: chebi
      id: CHEBI:21848
    structure: OC(=O)[C@H](CCCN(C(=[NH2])N)C)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0541:
    id: AA0541
    name: L-glutamate thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. This modification is currently
      represented in the PDB as part of the HET group for the entire molecule of nosiheptide.
      Generating Enzyme: peptidyl-cysteine cyclase (EC 4.2.1.-); peptidyl-thiazoline
      dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[-1-azanyl-3-carboxypropyl]-1,3-thiazole-4-carboxylic acid
    - 2-[(1S)-1-amino-3-carboxypropyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01815
    - ns: pdb.ligand
      id: BB9
    - ns: resid
      id: AA0541
    structure: O=Cc1csc(n1)[C@@H](CCC(=O)[O-])[NH3+]
    base_monomers:
    - E
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  AA0325:
    id: AA0325
    name: (phospho-5'-guanosine)-L-histidine
    comments: It is not known whether the phosphoramide bond is formed with the tele-
      or pros-nitrogen of histidine. The tele-linked form is presented.
    synonyms:
    - tele-5'-guanylic-L-histidine
    - L-histidine 5'-guanosine phosphoramidester
    - L-histidine monoanhydride with 5'-guanylic acid
    - (2S)-2-amino-3-(1-(5'-adenosine phosphono)imidazol-4-yl)propanoic acid
    - N1'-guanylylated histidine
    - N(tau)-5'-guanylic-L-histidine
    identifiers:
    - ns: go
      id: GO:0045427
    - ns: mod
      id: MOD:00330
    - ns: pdb.ligand
      id: 5GP
    - ns: resid
      id: AA0325
    structure: OC(=O)[C@H](Cc1ncn(c1)[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1nc(N)[nH]c2=O)[O-])[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 40
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 40
    - molecule: Monomer
      element: H
      position: 40
      charge: 1
  AA0082:
    id: AA0082
    name: L-arginine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - amino{[(4S)-4,5-diamino-5-oxopentyl]amino}methaniminium
    - '[amino-[[(4S)-4,5-diamino-5-oxo-pentyl]amino]methylidene]azanium'
    - arginineamide
    - (2S)-2-amino-5-[(diaminomethylidene)amino]pentanamide
    - argininamide
    - R
    - 2-amino-5-carbamimidamidopentanamide
    - 2-amino-5-guanidinopentanamide
    identifiers:
    - ns: cas
      id: 2788-83-2
    - ns: go
      id: GO:0018035
    - ns: pdb-ccd
      id: AAR
    - ns: resid
      id: AA0082
    - ns: mod
      id: MOD:00091
    - ns: pdb.ligand
      id: AAR
    - ns: chebi
      id: CHEBI:21236
    structure: NC(=[NH+]CCC[C@@H](C(=O)N)[NH3+])N
    base_monomers:
    - R
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0480:
    id: AA0480
    name: (2S)-4,5,5'-trihydroxyleucine
    synonyms:
    - (2S)-2-amino-4,5-dihydroxy-4-(hydroxymethyl)pentanoic acid
    - 4,5,5'-trihydroxyleucine
    - gamma,delta,delta'-trihydroxyleucine
    identifiers:
    - ns: resid
      id: AA0480
    - ns: mod
      id: MOD:01403
    structure: OCC(C[C@@H](C(=O)O)N)(CO)O
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0044:
    id: AA0044
    name: N-acetyl-L-glutamic acid
    comments: 'Generating Enzyme: peptide alpha-N-acetyltransferase (EC 2.3.1.88).'
    synonyms:
    - 2-(acetylamino)pentanedioic acid
    - 2-(acetylazanyl)pentanedioic acid
    - acetylglutamic acid
    - (2S)-2-(acetamido)pentanedioic acid
    identifiers:
    - ns: cas
      id: 1188-37-0
    - ns: go
      id: GO:0018002
    - ns: resid
      id: AA0044
    - ns: chebi
      id: CHEBI:17533
    - ns: mod
      id: MOD:00053
    structure: O=C[C@@H](NC(=O)C)CCC(=O)[O-]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  AA0299:
    id: AA0299
    name: L-leucine methyl ester
    comments: 'The carboxy-terminal motif for this modification, [PAMV][DG]YFL*, is
      strongly conserved. Generating Enzyme: [phosphatase 2A protein]-leucine-carboxy
      methyltransferase (EC 2.1.1.233).'
    synonyms:
    - 2-amino-4-methylpentanoic methyl ester
    - methyl (2S)-2-amino-4-methylpentanoate
    - methyl l-leucinate
    - alpha-aminoisocaproic methyl ester
    - methyl (2S)-2-amino-4-methyl-pentanoate
    - methyl L-leucinate
    - L
    identifiers:
    - ns: mod
      id: MOD:00304
    - ns: chebi
      id: CHEBI:44075
    - ns: pdb-ccd
      id: MLL
    - ns: go
      id: GO:0018439
    - ns: resid
      id: AA0299
    - ns: cas
      id: 2666-93-5
    - ns: pdb.ligand
      id: MLL
    structure: COC(=O)[C@H](CC(C)C)[NH3+]
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0115:
    id: AA0115
    name: N6-1-carboxyethyl-L-lysine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - NZ-(1-carboxyethyl)lysine
    - (2S)-2-amino-6-([(1S)-1-carboxyethyl]amino)hexanoic acid
    - N6-(1-carboxyethyl)lysine
    identifiers:
    - ns: mod
      id: MOD:00124
    - ns: cas
      id: 68852-50-6
    - ns: chebi
      id: CHEBI:53015
    - ns: go
      id: GO:0018238
    - ns: resid
      id: AA0115
    - ns: pdb.ligand
      id: MCL
    structure: O=C[C@H](CCCC[NH2+][C@H](C(=O)[O-])C)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0080:
    id: AA0080
    name: O-palmitoyl-L-serine
    comments: The palmitate represents a mixture of saturated and unsaturated fatty
      acids.
    synonyms:
    - (2S)-2-amino-3-(hexadecanoyloxy)propanoic acid
    - serine palmitate ester
    - O3-palmitoyl-serine
    - L-serine hexadecanoate ester
    identifiers:
    - ns: pdb.ligand
      id: PLM
    - ns: cas
      id: 88815-78-5
    - ns: go
      id: GO:0018221
    - ns: mod
      id: MOD:00089
    - ns: resid
      id: AA0080
    structure: CCCCCCCCCCCCCCCC(=O)OC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  AA0610:
    id: AA0610
    name: 3-methyl-L-lanthionine
    comments: "There are 3 chiral centers, so there are 8 possible stereoisomers.\
      \ Bacterial peptidyl-cysteine dehydroalanine/dehydrobutyrine ligase and peptide\
      \ conformation preferentially produce the (2S,3S,2'R) diastereomer. The cysteine\
      \ maintains its L configuration (R chirality), while the threonine 2-aminobutanoate\
      \ skeleton koses and then regains an L configuration (R chirality). For the\
      \ (2S,3S,2'R), see RESID:AA0112. Generating Enzyme: peptidyl-phosphoserine/phosphothreonine\
      \ dehydratase (EC 4.2.1.-); peptidyl-cysteine dehydroalanine/dehydrobutyrine\
      \ ligase (EC 6.2.-.-)."
    synonyms:
    - cysteine-3-L-butyrine thioether
    - 3-methyl-L,L-lanthionine
    - 2-azanyl-3-[(2-azanyl-2-carboxyethyl)sulfanyl]butanoic acid
    - (2R,3R,2'R)-2-amino-3-[(2-amino-2-carboxyethyl)thio]butanoic acid
    - (2R,3R,6R)-3-methyllanthionine
    - (2R,3R)-2-amino-3-([(2R)-2-amino-2-carboxyethyl]sulfanyl)butanoic acid
    - (2R,3R,6R)-2,6-diamino-3-methyl-4-thiaheptanedioic acid
    identifiers:
    - ns: mod
      id: MOD:01968
    - ns: resid
      id: AA0610
    structure: O=C[C@H](CS[C@@H]([C@@H](C(=O)O)[NH3+])C)[NH3+]
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0420:
    id: AA0420
    name: N4-(N-acetylamino)galactosyl-L-asparagine
    comments: This modification occurs in archaebacterial cell surface proteins with
      an NX[ST] motif. See also RESID:AA0151 and RESID:AA0421 for other N4-glycosylated
      asparagines.
    synonyms:
    - N4-(2-acetamido-2-deoxy-beta-D-galactopyranosyl)-L-asparagine
    - N4-asparagine-beta-N-acetylgalactosaminide
    - N4-glycosylasparagine
    - N4-glycosyl-L-asparagine
    - (2S)-2-amino-4-(2-acetamido-2-deoxy-beta-D-galactopyranosyl)amino-4-oxobutanoic
      acid
    - N4-(N-acetylgalactosaminyl)asparagine
    - N4-(2-acetylamino-2-deoxy-beta-D-galactopyranosyl)-L-asparagine
    identifiers:
    - ns: resid
      id: AA0420
    - ns: mod
      id: MOD:00832
    - ns: cas
      id: 100991-94-4
    structure: OC[C@H]1O[C@H](NC(=O)C[C@@H](C(=O)O)N)[C@@H]([C@H]([C@H]1O)O)NC(=O)C
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0607:
    id: AA0607
    name: N4-(2,4-diacetamido-2,4,6-trideoxy-D-glucosyl)-L-serine
    comments: Bacillosamine is a trivial name formed by modification of a non-standard
      monosaccharide parent name, and is not recommended by the IUPAC Nomenclature
      Committee. Some authors use bacillosamine to refer to the diacetylated form,
      rather than the unacetylated form. For O-(2,4-diacetamido-2,4-dideoxy-D-glucosyl)-L-serine,
      see RESID:AA0499.
    synonyms:
    - DATDH
    - O-[N2,N4-diacetylbacillosaminyl]serine
    - DABA
    - (2S)-2-amino-4-[(2,4-diacetamido-2,4,6-trideoxy-beta-D-glucopyranosyl)oxy]propanoic
      acid
    - DiNAcBac
    - O-[N,N-diacetylbacillosaminyl]serine
    - O-[2,4-bis(acetylamino)-2,4,6-trideoxy-beta-D-glucopyranosyl]-L-serine
    identifiers:
    - ns: resid
      id: AA0607
    - ns: mod
      id: MOD:01963
    structure: CC(=O)N[C@H]1[C@H](OC[C@@H](C(=O)O)[NH3+])O[C@@H]([C@H]([C@@H]1O)NC(=O)C)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0047:
    id: AA0047
    name: N-acetyl-L-isoleucine
    comments: The occurrence of this modification has not been confirmed.
    synonyms:
    - 2-acetylamino-3-methylpentanoic acid
    - 2-acetylazanyl-3-methylpentanoic acid
    - acetylisoleucine
    - (2S,3S)-2-acetamido-3-methylpentanoic acid
    identifiers:
    - ns: resid
      id: AA0047
    - ns: mod
      id: MOD:00056
    - ns: chebi
      id: CHEBI:21555
    - ns: cas
      id: 3077-46-1
    - ns: go
      id: GO:0017194
    structure: CC[C@@H]([C@@H](C(=O)O)NC(=O)C)C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0219:
    id: AA0219
    name: 1-chondroitin sulfate-L-aspartic acid ester
    synonyms:
    - poly[beta-1,4-D-glucopyranuronosyl-beta-1,3-(2-acetamido-2-deoxy-4-sulfate D-galactosyl)]beta-1,4-D-glucopyranuronosyl-beta-1,3-(2-acetamido-2-deoxy-4-sulfate-6-(1-L-aspartyl)-D-galactose)
    - protein-glycosaminoglycan-protein cross-link
    - 1-aspartic acid ester with 6-chondroitin 4-sulfate
    identifiers:
    - ns: mod
      id: MOD:00224
    - ns: resid
      id: AA0219
    - ns: go
      id: GO:0019800
    structure: CC(=O)N[C@H]1[C@H](O)O[C@@H]([C@@H]([C@@H]1O[C@@H]1O[C@@H](C[C@@H]([C@H]1O)O)C(=O)[O-])OS(=O)(=O)[O-])COC(=O)[C@H](CC(=O)[O-])[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 30
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0217:
    id: AA0217
    name: 2'-alpha-mannosyl-L-tryptophan
    comments: The carbohydrate, identified as mannose, is linked to tryptophan by
      an unusual C-glycosidic linkage. The structures determined in NMR and X-ray
      diffraction studies differ in assigning the glycosylation as being alpha or
      beta, respectively.  The beta anomeric form is shown.
    synonyms:
    - 2'-tryptophan C-mannoside
    - (2S)-2-amino-3-(2-beta-D-mannopyranosyl-1H-indol-3-yl)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018103
    - ns: pdb.ligand
      id: BMA
    - ns: resid
      id: AA0217
    - ns: mod
      id: MOD:00222
    structure: OC[C@H]1O[C@@H]([C@H]([C@H]([C@@H]1O)O)O)c1[nH]c2c(c1C[C@@H](C(=O)O)[NH3+])cccc2
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
    - molecule: Monomer
      element: H
      position: 28
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    - molecule: Monomer
      element: H
      position: 29
      charge: 1
  AA0198:
    id: AA0198
    name: D-tryptophan
    comments: 'Generating Enzyme: protein-tryptophan epimerase (EC 5.1.1.-).'
    synonyms:
    - (R)-2-amino-3-(1H-indol-3-yl)propanoic acid
    - alpha-amino-beta-(3-indolyl)propionoic acid
    identifiers:
    - ns: resid
      id: AA0198
    - ns: cas
      id: 153-94-6
    - ns: go
      id: GO:0019128
    - ns: pdb.ligand
      id: DTR
    - ns: chebi
      id: CHEBI:29955
    - ns: mod
      id: MOD:00205
    structure: OC(=O)[C@@H](Cc1c[nH]c2c1cccc2)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0455:
    id: AA0455
    name: S-palmitoleyl-L-serine
    comments: 'Generating Enzyme: protein-serine O-palmitoleyltransferase (EC 2.3.1.-).'
    synonyms:
    - (2S)-2-amino-3-((9Z)-9-hexadecenoyloxy)propanoic acid
    - O3-palmitoleyl-serine
    - L-serine cis-9-hexadecenoate ester
    identifiers:
    - ns: resid
      id: AA0455
    - ns: mod
      id: MOD:01381
    - ns: pdb.ligand
      id: PAM
    structure: CCCCCC/C=C\CCCCCCCC(=O)OC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  AA0338:
    id: AA0338
    name: N-methyl-L-tyrosine
    comments: 'This modification is predicted for proteins homologous to pilin in
      certain organisms where the position corresponding to N-methylphenylalanine
      instead encodes tyrosine. Polypeptides with monomethylated amino terminals can
      undergo premature cleavage during the coupling step of an Edman degradation.
      This can result in "preview" with both a residue and the following residue being
      seen from the first step on through a sequence. Generating Enzyme: prepilin
      peptidase (EC 3.4.23.43).'
    synonyms:
    - (2S)-3-(4-hydroxyphenyl)-2-methylamino-propanoic acid
    - (2S)-3-(4-hydroxyphenyl)-2-(methylamino)propanoic acid
    - N-methyltyrosine
    - n-methyl-l-tyrosine
    - N-methyl-L-tyrosine
    identifiers:
    - ns: go
      id: GO:0046897
    - ns: cas
      id: 537-49-5
    - ns: mod
      id: MOD:00343
    - ns: pdb-ccd
      id: YNM
    - ns: resid
      id: AA0338
    structure: C[NH2+][C@H](C(=O)O)Cc1ccc(cc1)O
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  AA0523:
    id: AA0523
    name: omega-N,omega-N,omega-N'-trimethyl-L-arginine
    comments: No enzyme activities capable of producing this modification under physiological
      conditions have been reported.
    synonyms:
    - N5-[(dimethylamino)(imino)methyl]ornithine
    - 2-[(4S)-4-amino-5-oxopentyl]-1,1,3-trimethylguanidine
    - N(G)-trimethylarginine
    - (2S)-2-amino-5-([(dimethylamino)(methylimino)methyl]amino)pentanoic acid
    - (2S)-2-amino-5-([(dimethylamino)(methylamino)methylidene]amino)pentanoic acid
    identifiers:
    - ns: resid
      id: AA0523
    - ns: mod
      id: MOD:01669
    structure: CN/C(=[NH+]/CCC[C@@H](C(=O)O)[NH3+])/N(C)C
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0337:
    id: AA0337
    name: N-methyl-L-leucine
    comments: 'This modification is predicted for proteins homologous to pilin in
      certain organisms where the position corresponding to N-methylphenylalanine
      instead encodes leucine. Polypeptides with monomethylated amino terminals can
      undergo premature cleavage during the coupling step of an Edman degradation.
      This can result in "preview" with both a residue and the following residue being
      seen from the first step on through a sequence. Generating Enzyme: prepilin
      peptidase (EC 3.4.23.43).'
    synonyms:
    - (S)-2-methylamino-4-methylpentanoic acid
    - N-methylleucine
    - 2-(methylamino)-4-methyl-valeric acid
    - n-methylleucine
    - (2S)-4-methyl-2-(methylamino)pentanoic acid
    - L
    - N-methyl-L-leucine
    identifiers:
    - ns: pdb.ligand
      id: MLE
    - ns: pdb-ccd
      id: MLE
    - ns: cas
      id: 3060-46-6
    - ns: go
      id: GO:0046896
    - ns: resid
      id: AA0337
    - ns: mod
      id: MOD:00342
    structure: C[NH2+][C@H](C(=O)O)CC(C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  AA0582:
    id: AA0582
    name: 3-methoxydidehydroalanine
    comments: It has not been established whether the natural form is the Z or the
      E isomer. The Z isomer is shown.
    synonyms:
    - 2-amino-3-methoxyprop-2-enoic acid
    - 3-methoxydidehydroalanine
    identifiers:
    - ns: mod
      id: MOD:01922
    - ns: resid
      id: AA0582
    structure: CO/C=C(/C(=O)O)\N
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0191:
    id: AA0191
    name: D-alanine
    comments: 'Generating Enzyme: protein-alanine epimerase (EC 5.1.1.-).'
    synonyms:
    - (R)-2-aminopropanoic acid
    identifiers:
    - ns: resid
      id: AA0191
    - ns: cas
      id: 338-69-2
    - ns: mod
      id: MOD:00198
    - ns: mod
      id: MOD:00858
    - ns: pdb.ligand
      id: DAL
    - ns: go
      id: GO:0019122
    - ns: chebi
      id: CHEBI:29949
    structure: C[C@@H]([NH3+])C(=O)O
    base_monomers:
    - A
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  AA0118:
    id: AA0118
    name: N6-lipoyl-L-lysine
    comments: 'Generating Enzyme: lipoate--protein ligase (EC 6.3.4.-).'
    synonyms:
    - N6-6,8-dithiooctanoyllysine
    - 2-amino-6-(5-[1,2-dithiolan-3-yl]-1-oxopentyl)aminohexanoic acid
    - (2S)-2-amino-6-[(5-[(3R)-1,2-dithiolan-3-yl]pentanoyl)amino]hexanoic acid
    - (2S)-2-amino-6-(5-[(3R)-1,2-dithiolan-3-yl]pentanamido)hexanoic acid
    - N6-lipoyllysine
    - (2S,6'R)-2-amino-6-(6,8-dithiooctanamido)hexanoic acid
    identifiers:
    - ns: resid
      id: AA0118
    - ns: pdb.ligand
      id: LPA
    - ns: cas
      id: 1200-22-2
    - ns: go
      id: GO:0018055
    - ns: mod
      id: MOD:00127
    - ns: chebi
      id: CHEBI:14919
    structure: O=C(CCCC[C@@H]1CCSS1)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  AA0250:
    id: AA0250
    name: 3-(3'-L-histidyl)-L-tyrosine
    comments: The chirality of tyrosine C-3 is not specified; from the model it appears
      to be 3R. This modification is different from the modification 3'-(1'-L-histidyl)-L-tyrosine,
      see RESID:AA0270.
    synonyms:
    - 3-(pi-histidyl)tyrosine
    - beta-(N3'-histidyl)tyrosine
    - (2S,3R)-2-amino-3-(5-[(2S)-2-amino-2-carboxyethyl]-1H-imidazol-1-yl)-3-(4-hydroxyphenyl)propanoic
      acid
    - 3-(N3'-histidyl)tyrosine
    - 3-(pros-histidyl)tyrosine
    - beta-(N(delta)-histidyl)tyrosine
    identifiers:
    - ns: go
      id: GO:0018150
    - ns: mod
      id: MOD:00255
    - ns: resid
      id: AA0250
    structure: O=C[C@H]([C@H](n1cncc1C[C@@H](C(=O)O)[NH3+])c1ccc(cc1)O)N
    base_monomers:
    - Y
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0584:
    id: AA0584
    name: O-octanoyl-L-cysteine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-amino-3-(octanoylsulfanyl)propanoic acid
    - 2-amino-3-(octanoylthio)propanoic acid
    - cysteine octanoate thioester
    identifiers:
    - ns: mod
      id: MOD:01924
    - ns: resid
      id: AA0584
    structure: CCCCCCCC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0113:
    id: AA0113
    name: 3'-(S-L-cysteinyl)-L-tyrosine
    comments: In galactose oxidase, cysteinyltyrosine may exist as a stable free radical;
      the bond between the sulfur and the phenyl ring appears to have some double
      bond character. This modification should not be confused with 3-(S-L-cysteinyl)-L-tyrosine
      (see RESID:AA0396).
    synonyms:
    - S-(tyros-3'-yl)cysteine
    - (2S)-2-amino-3-(3-[(2R)2-amino-2-carboxyethylsulfanyl]-4-hydroxyphenyl)propanoic
      acid
    - 2-amino-3-[3-(2-amino-2-carboxyethylthio)-4-hydroxyphenyl]propanoic acid
    - 3'-(cystein-S-yl)tyrosine
    identifiers:
    - ns: resid
      id: AA0113
    - ns: mod
      id: MOD:00122
    - ns: go
      id: GO:0018234
    structure: O=C[C@H](CSc1cc(ccc1O)C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - Y
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0521:
    id: AA0521
    name: N-(DNA-1',2'-dideoxyribos-1'-ylidene)-L-valine
    comments: "The model has three open valences, one on the valine carboxyl group\
      \ and two in the DNA nucleotide segment on the 5'-phosphate and the 3'-hydroxyl.\
      \ The keyword \"phosphoprotein\" is not used with polynucleotide-linked intermediate\
      \ modifications. Generating Enzyme: DNA glycosylase (EC 3.2.2.-)."
    synonyms:
    - (2S)-2-[(3R,4R)-3,4-dihydroxy-5-(phosphonooxy)pentylidene]amino-3-methylbutanoic
      acid
    - DNA glycosylase valine Schiff base intermediate
    identifiers:
    - ns: resid
      id: AA0521
    - ns: mod
      id: MOD:01665
    structure: OP(OC[C@H]([C@H](CC[NH2+][C@H](C(=O)O)C(C)C)O)O)O
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0261:
    id: AA0261
    name: N-L-glutamyl-poly-L-glutamic acid
    comments: 'Generating Enzyme: ribosomal S6--glutamic acid ligase (EC 6.3.2.-).'
    identifiers:
    - ns: mod
      id: MOD:00266
    - ns: go
      id: GO:0018170
    - ns: resid
      id: AA0261
    structure: '[O-]C(=O)CC[C@@H](C(=O)N[C@H](C(=O)[O-])CCC(=O)[O-])[NH3+]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  G, Q:
    id: AA0189
    name: 2-imino-glutamine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a glutamine, to the alpha-amino nitrogen
      of residue N+2, a glycine, coupled with the formation of a double bond to the
      alpha-amino nitrogen of residue N, and the loss of a molecule of water. This
      cross-link is accompanied by modification of residue N+1. The modified residue
      N+1 is presented in a separate entry and is not included in the mass accounting
      of this entry. The backbone atoms of residue N+1 are shown in gray in the diagram.
      Generating Enzyme: autocatalytic.'
    synonyms:
    - 2,N-didehydroglutaminyl-5-imidazolinone glycine
    - '[2-(4-amino-4-oxobutanimidoyl)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic acid'
    - fluorescent protein FP583 chromophore
    - '[2-(3-carbamoyl-1-imino-propyl)-4-(4-hydroxy-benzylidene)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic
      acid'
    - 2-[(4Z)-2-(4-azanyl-4-oxidanylidene-butanimidoyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-[(1E)-4-amino-4-oxobutanimidoyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-(3-carbamoyl-1-imino-propyl)-1-carboxymethyl-1-imidazolin-5-one
    - '[2-(3-carbamoyl-1-imino-propyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid'
    - QYG
    - red fluorescent protein chromophore
    identifiers:
    - ns: go
      id: GO:0019729
    - ns: mod
      id: MOD:00197
    - ns: pdb-ccd
      id: CRQ
    - ns: pdb.ligand
      id: CRQ
    - ns: resid
      id: AA0189
    structure: NC(=O)CCC(=N)C1=NCC(=O)N1CC(=O)O
    base_monomers:
    - Q
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0269:
    id: AA0269
    name: L-cysteine persulfide
    comments: In desulfurization, the sulfur is donated by free cysteine to peptidyl-cysteine
      producing free alanine and peptidyl-cysteine persulfide. See also RESID:AA0101
      and RESID:AA0268.
    synonyms:
    - 3-disulfanylalanine
    - 2-amino-3-persulfhydrylpropanoic acid
    - S-mercaptocysteine
    - (2R)-2-amino-3-disulfanyl-propanoic acid
    - 3-disulfanyl-L-alanine
    - 2-amino-3-hydrodisulfidopropanoic acid
    - s-mercaptocysteine
    - C
    - S-sulfanylcysteine
    - thiocysteine
    - 2-amino-3-disulfanylpropanoic acid
    - 3-(thiosulfeno)-alanine
    - 2-amino-3-hydropersulfidopropanoic acid
    - (R)-2-amino-3-disulfanylpropanoic acid
    identifiers:
    - ns: mod
      id: MOD:00274
    - ns: pdb-ccd
      id: CSS
    - ns: go
      id: GO:0018179
    - ns: chebi
      id: CHEBI:61963
    - ns: resid
      id: AA0269
    - ns: pdb.ligand
      id: CSS
    - ns: cas
      id: 5652-32-4
    structure: OC(=O)[C@@H]([NH3+])CSS
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0608:
    id: AA0608
    name: O-(2-acetamido-4-glyceramido-2,4,6-trideoxy-D-glucosyl)-L-serine
    comments: The stereochemical identity of the sugar and the glyceryl group have
      not been established by chemical methods.
    synonyms:
    - O-(2-acetamido-4-glyceramido-2,4,6-trideoxy-D-glucopyranosyl)-L-serine
    - GATDH
    - O-(N2-acetyl-N4-glycerylbacillosaminyl)-L-serine
    - (2S)-2-amino-3-[(2-acetamido-4-glycerylamino-2,4,6-trideoxy-D-glucopyranosyl)oxy]propanoic
      acid
    identifiers:
    - ns: mod
      id: MOD:01964
    - ns: resid
      id: AA0608
    structure: OC[C@@H](C(=O)N[C@@H]1[C@@H](C)O[C@H]([C@@H]([C@H]1O)NC(=O)C)OC[C@@H](C(=O)O)[NH3+])O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 29
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 32
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
    - molecule: Monomer
      element: H
      position: 31
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    - molecule: Monomer
      element: H
      position: 32
      charge: 1
  K, M:
    id: AA0501
    name: S-(L-lysyl)-L-methionine sulfilimine
    comments: The process for formation of the sulfanylimine bond has not been determined.
      It might involve the initial formation of methionine sulfoxide. The lysine involved
      in this cross-link in collagen IV is usually hydroxylated, but it is not subsequently
      glycosylated.
    synonyms:
    - (2S)-2-amino-6-([(E)-[(3S)-3-amino-3-carboxypropyl](methyl)-lambda(4)-sulfanylidene]amino)hexanoic
      acid
    - S-lysyl-methionine
    - (E)-N6-([(3S)-3-amino-3-carboxypropyl](methyl)-lambda(4)-sulfanylidene)-L-lysine
    identifiers:
    - ns: resid
      id: AA0501
    - ns: mod
      id: MOD:01602
    structure: O=C[C@H](CCCC/N=[S@](/CC[C@@H](C(=O)O)[NH3+])\C)[NH3+]
    base_monomers:
    - K
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0527:
    id: AA0527
    name: N6-octanoyl-L-lysine
    comments: 'The metabolic role of this modification is uncertain. Generating Enzyme:
      octanoyltransferase (EC 2.3.1.181).'
    synonyms:
    - (2S)-2-amino-6-(octanoylamino)hexanoic acid
    - N6-(1-oxooctyl)-L-lysine
    - epsilon-octanoyllysine
    - N(zeta)-octanoyllysine
    identifiers:
    - ns: resid
      id: AA0527
    - ns: mod
      id: MOD:01774
    - ns: cas
      id: 23735-96-8
    structure: CCCCCCCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0090:
    id: AA0090
    name: L-isoleucine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - isoleucinamide
    - (2S,3S)-2-amino-3-methylpentanamide
    identifiers:
    - ns: cas
      id: 14445-54-6
    - ns: chebi
      id: CHEBI:21345
    - ns: resid
      id: AA0090
    - ns: mod
      id: MOD:00099
    - ns: go
      id: GO:0018043
    - ns: pdb.ligand
      id: NH2
    structure: CC[C@@H]([C@@H](C(=O)N)[NH3+])C
    base_monomers:
    - I
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  H, M:
    id: AA0566
    name: N-[(L-histidin-1'-yl)methyl]-L-methionine
    comments: 'The electron density model has contradictory characteristics. The bond
      distances from the "formyl" carbon to the two nitrogens are in the single bond
      range, and the torsion angles around those bonds are not planar, suggesting
      that neither is a double bond. However, the bond angle between that carbon and
      the two nitrogens is closer to trigonal than to tetrahedral, suggesting sp2
      hybridization. The modification is shown in a reduced state. Since both the
      source organism and the expression host encode N-formylmethionine initiator
      and the autocatalytic modification can occur before completion of translation,
      it is probable but not yet established that the modification occurs under natural
      conditions. Generating Enzyme: autocatalytic.'
    synonyms:
    - (2S)-2-([(4-[(2S)-2-amino-2-carboxyethyl]-1H-imidazol-1-yl)methyl]amino)-4-(methylsulfanyl)butanoic
      acid
    identifiers:
    - ns: pdb.ligand
      id: FME
    - ns: mod
      id: MOD:01890
    - ns: mod
      id: MOD:01891
    - ns: resid
      id: AA0566
    structure: CSCC[C@@H](C(=O)O)NCn1cnc(c1)C[C@@H](C=O)[NH3+]
    base_monomers:
    - AA0021
    - M
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0399:
    id: AA0399
    name: O-(N-acetylaminoglucosyl)-L-threonine
    comments: 'See also RESID:AA0155, RESID:AA0247, RESID:AA0401, RESID:AA0403, RESID:AA0405,
      and RESID:AA0515 for other O-glycosylated threonines. The PDB has some entries
      with threonine apparently alpha-glycosylated with N-acetylglucosamine. These
      are low resolution structures and appear to be erroneous. Generating Enzyme:
      [protein]-L-serine/L-threonine beta-N-acetyl-D-glucosaminyl-transferase (EC
      2.4.1.-).'
    synonyms:
    - O-threonyl-beta-N-acetylglucosaminide
    - O3-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-L-threonine
    - O3-(N-acetylglucosaminyl)threonine
    - O-glycosylthreonine
    - O-(2-acetylamino-2-deoxy-beta-D-glucopyranosyl)-L-threonine
    - (2S,3R)-2-amino-3-(2-acetamido-2-deoxy-beta-D-glucopyranosyloxy)butanoic acid
    - O-(N-acetylglucosaminyl)-L-threonine
    identifiers:
    - ns: mod
      id: MOD:00806
    - ns: cas
      id: 10036-64-3
    - ns: pdb.ligand
      id: NDG
    - ns: resid
      id: AA0399
    structure: OC[C@H]1O[C@@H](O[C@@H]([C@@H](C(=O)O)[NH3+])C)[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0486:
    id: AA0486
    name: 1-amino-2-propanone
    synonyms:
    - aminoacetone
    - 1-aminopropan-2-one
    - 1-aminopropanone
    identifiers:
    - ns: mod
      id: MOD:01433
    - ns: cas
      id: 298-08-8
    - ns: chebi
      id: CHEBI:17906
    - ns: resid
      id: AA0486
    structure: CC(=O)C[NH3+]
    base_monomers:
    - T
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0433:
    id: AA0433
    name: N,N-dimethyl-L-alanine
    comments: 'Generating Enzyme: ribosomal protein L11 methyltransferase prmA (EC
      2.1.1.-); N-terminal RCC1 methyltransferase (EC 2.1.1.-).'
    synonyms:
    - (S)-2-(dimethylamino)propanoic acid
    - N,N-dimethyl-L-alanine
    - (2S)-2-dimethylaminopropanoic acid
    - n,n-dimethyl-l-alanine
    - (S)-1-carboxy-N,N-dimethylaminoethane
    - N,N-dimethylalanine
    - A
    identifiers:
    - ns: resid
      id: AA0433
    - ns: cas
      id: 2812-31-9
    - ns: mod
      id: MOD:01179
    - ns: pdb-ccd
      id: LAL
    - ns: go
      id: GO:0018011
    structure: C[C@@H](C(=O)O)[NH+](C)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
  AA0251:
    id: AA0251
    name: L-methionine sulfone
    synonyms:
    - (2S)-2-amino-4-methylsulfonyl-butanoic acid
    - S,S-dioxymethionine
    - L-methionine S,S-dioxide
    - (2S)-2-amino-4-(methylsulfonyl)butanoic acid
    - M
    - s-dioxymethionine
    identifiers:
    - ns: cas
      id: 7314-32-1
    - ns: resid
      id: AA0251
    - ns: mod
      id: MOD:00256
    - ns: pdb-ccd
      id: OMT
    - ns: go
      id: GO:0018159
    - ns: pdb.ligand
      id: OMT
    structure: OC(=O)[C@H](CCS(=O)(=O)C)[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0443:
    id: AA0443
    name: (2S,4R)-5-hydroxyleucine
    comments: The oxidation artifacts 5-hydroxyleucine and 5-oxoleucine can form autocatalytically
      and stereospecifically, but not selectively. It is not clear whether the modified
      residue subsequently takes part in catalytic reactions at the active site of
      alpha-ketoglutarate-dependent dioxygenase alkB homolog 3 (ABH3).
    synonyms:
    - delta-hydroxyleucine
    - (4R)-5-hydroxyleucine
    - (2S,4R)-2-amino-5-hydroxy-4-methylpentanoic acid
    - (2~{S},4~{R})-2-azanyl-4-methyl-5-oxidanyl-pentanoic acid
    - L
    - (2s,4r)-5-hydroxyleucine
    identifiers:
    - ns: pdb-ccd
      id: HL5
    - ns: mod
      id: MOD:01373
    - ns: resid
      id: AA0443
    structure: OC[C@@H](C[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0171:
    id: AA0171
    name: S-sulfo-L-cysteine
    synonyms:
    - cysteine-S-sulfonic acid
    - 3-(sulfosulfanyl)-L-alanine
    - (2R)-2-amino-3-(sulfosulfanyl)propanoic acid
    - cysteine-s-sulfonic acid
    - C
    - S-sulfocysteine
    - 2-amino-3-(sulfothio)propanoic acid
    - (2R)-2-amino-3-sulfosulfanyl-propanoic acid
    - cysteine sulfate thioester
    identifiers:
    - ns: mod
      id: MOD:00180
    - ns: go
      id: GO:0018248
    - ns: chebi
      id: CHEBI:27891
    - ns: resid
      id: AA0171
    - ns: pdb-ccd
      id: CSU
    - ns: cas
      id: 1637-71-4
    - ns: pdb.ligand
      id: CSU
    structure: OC(=O)[C@H](CSS(O)(O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0049:
    id: AA0049
    name: N-acetyl-L-methionine
    comments: 'Although appropriate, the keyword "thioether bond" normally does not
      appear for this amino acid. Generating Enzyme: peptide alpha-N-acetyltransferase
      (EC 2.3.1.88).'
    synonyms:
    - 2-acetylamino-4-(methylthio)butanoic acid
    - methionamine
    - (2S)-2-acetamido-4-(methylsulfanyl)butanoic acid
    - 2-acetylamino-4-(methylsulfanyl)butanoic acid
    - acetylmethionine
    - 2-acetylazanyl-4-(methylsulfanyl)butanoic acid
    identifiers:
    - ns: cas
      id: 65-82-7
    - ns: chebi
      id: CHEBI:21557
    - ns: go
      id: GO:0017196
    - ns: resid
      id: AA0049
    - ns: mod
      id: MOD:00058
    structure: CSCC[C@@H](C(=O)O)NC(=O)C
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0211:
    id: AA0211
    name: N6-formyl-L-lysine
    synonyms:
    - (2S)-2-amino-6-(formylamino)hexanoic acid
    - N(zeta)-formyllysine
    - epsilon-formyllysine
    identifiers:
    - ns: cas
      id: 1190-48-3
    - ns: resid
      id: AA0211
    - ns: go
      id: GO:0018257
    - ns: mod
      id: MOD:00216
    structure: O=CNCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0500:
    id: AA0500
    name: 3'-farnesyl-2',3'-dihydro-2',N2-cyclo-L-tryptophan
    synonyms:
    - (2S,3aR,8aS)-3a-[(2E,6E)-3,7,11-trimethyldodeca-2,6,10-trien-1-yl]-1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole-2-carboxylic
      acid
    identifiers:
    - ns: resid
      id: AA0500
    - ns: chebi
      id: CHEBI:52950
    - ns: mod
      id: MOD:01590
    structure: C/C(=C\C[C@]12C[C@H](N[C@H]1Nc1c2cccc1)C(=O)O)/CC/C=C(/CCC=C(C)C)\C
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0358:
    id: AA0358
    name: L-cysteinyl-L-selenocysteine
    comments: The experimental redox potential of cysteinylselenocysteine in synthetic
      glutaredoxin 3 is -260 to -275 mV. See RESID:AA0025 and RESID:AA0437.
    synonyms:
    - (R,R)-2-amino-3-[3-(2-aminopropanoic acid)sulfanyl]selanylpropanoic acid
    identifiers:
    - ns: resid
      id: AA0358
    - ns: mod
      id: MOD:00867
    - ns: mod
      id: MOD:00363
    - ns: go
      id: GO:0050837
    structure: O=C[C@H](CS[Se]C[C@@H](C(=O)O)N)[NH3+]
    base_monomers:
    - C
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0221:
    id: AA0221
    name: 1'-(8alpha-FAD)-L-histidine
    comments: 'The arrangement of the attachment has not been completely established
      in some cases. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: apo mitochondrial succinate dehydrogenase
      [ubiquinone] flavoprotein subunit---FAD ligase sdh5 (EC 6.3.4.-).'
    synonyms:
    - (S)-2-amino-3-(1-[8alpha riboflavin 5'-(trihydrogen diphosphate) 5'->5'-ester
      with adenosine]imidazol-4-yl)propanoic acid
    - N(tau)-(8alpha-FAD)-histidine
    - 8alpha-(N(epsilon)-histidyl)FAD
    - tele-(8alpha-FAD)-histidine
    - 8alpha-N3-histidyl FAD [misnomer]
    - 8alpha-(N1'-histidyl)FAD
    identifiers:
    - ns: resid
      id: AA0221
    - ns: pdb.ligand
      id: FAD
    - ns: go
      id: GO:0018297
    - ns: mod
      id: MOD:00226
    structure: O=c1[nH]c(=O)c2c([nH]1)n(C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc3c1NC=N[C@H]3N)[O-])[O-])O)O)O)c1=C[C@H](C(=Cc1[nH+]2)C)Cn1cnc(c1)C[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 74
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 77
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 76
    - molecule: Monomer
      element: H
      position: 76
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 77
    - molecule: Monomer
      element: H
      position: 77
      charge: 1
  AA0028:
    id: AA0028
    name: 5-hydroxy-L-lysine
    comments: 'Some forms of lysyl hydroxylase are multifunctional and possess both
      galactosyltransferase (EC 2.4.1.50) and glucosyltransferase (EC 2.4.1.66) activities.
      Generating Enzyme: procollagen-lysine 5-dioxygenase (EC 1.14.11.4).'
    synonyms:
    - 2,6-diamino-2,3,4,6-tetradeoxyhexonic acid
    - L-erythro-delta-hydroxylysine
    - alpha,epsilon-diamino-delta-hydroxycaproic acid
    - 2,6-bisazanyl-5-hydroxyhexanoic acid
    - (5R)-5-hydroxy-L-lysine
    - (2S,5R)-2,6-diamino-5-hydroxy-hexanoic acid
    - K
    - 5-hydroxylysine
    - (2S,5R)-2,6-diamino-5-hydroxyhexanoic acid
    identifiers:
    - ns: resid
      id: AA0028
    - ns: pdb-ccd
      id: LYZ
    - ns: go
      id: GO:0018395
    - ns: mod
      id: MOD:00037
    - ns: chebi
      id: CHEBI:18040
    - ns: cas
      id: 1190-94-9
    - ns: pdb.ligand
      id: LYZ
    structure: '[NH3+]C[C@@H](CC[C@@H](C(=O)O)[NH3+])O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  W, W:
    id: AA0544
    name: 1-(L-tryptophan-3-yl)-L-tryptophan
    comments: 'The production of this cross-link during bicarbonate-dependent peroxidase
      catalysis may be artifactual. Generating Enzyme: autocatalytic.'
    synonyms:
    - 3-[(2S)-2-amino-2-carboxyethyl]-3-(3-[(2S)-2-amino-2-carboxyethyl]-1H-indol-2-yl)-1H-indole
    - (2S,2'S)-3,3'-(3'H-1,3'-biindole-3,3'-diyl)bis(2-aminopropanoic acid)
    - 3-[2-azanyl-2-carboxyethyl]-3-(3-[2-azanyl-2-carboxyethyl]-1H-indol-2-yl)-1H-indole
    - ditryptophan
    - 2-amino-3-[2-[2-amino-3-(2-carboxyethyl)-1H-indol-4-yl]-1H-indol-3-yl]propanoic
      acid
    identifiers:
    - ns: resid
      id: AA0544
    - ns: mod
      id: MOD:01818
    structure: O=C[C@H](Cc1cn(c2c1cccc2)[C@@]1(C=Nc2c1cccc2)C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
    - molecule: Monomer
      element: H
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  AA0381:
    id: AA0381
    name: L-lysine 5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a lysine, to the alpha-amino nitrogen of
      residue N+2, a glycine, coupled with the formation of a double bond to the alpha-amino
      nitrogen of residue N+1 which loses one hydrogen, and the loss of a molecule
      of water. This cross-link is accompanied by modification of residue N+1. The
      modified residue N+1 is presented in a separate entry and is not included in
      the mass accounting of this entry. The backbone atoms of residue N+1 are shown
      in gray in the diagram. Generating Enzyme: autocatalytic.'
    synonyms:
    - '{(4Z)-2-[(1S)-1,5-diaminopentyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - lysyl-5-imidazolinone glycine
    - 2-[(4Z)-2-[(1S)-1,5-diaminopentyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - '[2-(1,5-diaminopentanyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid'
    - 2-[(S)-1,5-diaminopentanyl]-1-carboxymethyl-1-imidazolin-5-one
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - Anemonia majano fluorescent protein FP486 chromophore
    - KYG
    - (2-[(1S)-1,5-diaminopentyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic acid
    - '[(4z)-2-[(1s)-1,5-diaminopentyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CR7
    - ns: resid
      id: AA0381
    - ns: mod
      id: MOD:00386
    - ns: go
      id: GO:0051361
    - ns: pdb.ligand
      id: CR7
    structure: '[NH3+]CCCC[C@@H](C1=NCC(=O)N1CC(=O)O)[NH3+]'
    base_monomers:
    - K
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0057:
    id: AA0057
    name: N-formylglycine
    comments: This modification should not be confused with L-3-oxoalanine, also referred
      to as C(alpha)-formylglycine (see RESID:AA0185).
    synonyms:
    - (formylamino)ethanoic acid
    - (formylamino)acetic acid
    - N(alpha)-formylglycine
    - 2-formamidoethanoic acid
    - 2-formamidoacetic acid
    - (formylazanyl)ethanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:21717
    - ns: cas
      id: 2491-15-8
    - ns: mod
      id: MOD:00066
    - ns: go
      id: GO:0018005
    - ns: resid
      id: AA0057
    structure: O=CNCC(=O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  AA0282:
    id: AA0282
    name: (2S,3R,4S)-3,4-dihydroxyproline
    synonyms:
    - (2S,3R,4S)-3,4-dihydroxypyrrolidine-2-carboxylic acid
    - trans-2,3-cis-3,4-dihydroxy-L-proline
    - 2-alpha-3-beta-4-beta-3,4-dihydroxyproline
    - 2,3-trans-3,4-cis-3,4-dihydroxy-L-proline
    identifiers:
    - ns: mod
      id: MOD:00287
    - ns: cas
      id: 95341-64-3
    - ns: resid
      id: AA0282
    - ns: go
      id: GO:0018188
    structure: O[C@H]1C[NH2+][C@@H]([C@H]1O)C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AA0520:
    id: AA0520
    name: 7'-hydroxy-L-tryptophan
    comments: "This modification without secondary glycosylation (see RESID:AA0506)\
      \ has only been observed as the first precursor form of 4'-(L-tryptophan)-L-tryptophyl\
      \ quinone (see RESID:AA0149). Generating Enzyme: peptidyl-tryptophan 7-oxygenase\
      \ MauX (EC 1.-.-.-)."
    synonyms:
    - 7-hydroxy-l-tryptophan
    - W
    - (2S)-2-amino-3-(7-hydroxy-1H-indol-3-yl)propanoic acid
    - 7-hydroxy-L-tryptophan
    identifiers:
    - ns: pdb.ligand
      id: 0AF
    - ns: pdb-ccd
      id: 0AF
    - ns: resid
      id: AA0520
    - ns: mod
      id: MOD:01664
    structure: OC(=O)[C@H](Cc1c[nH]c2c1cccc2O)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0382:
    id: AA0382
    name: 2-tetrahydropyridinyl-5-imidazolinone glycine
    comments: 'This entry represents the cross-link of the peptide backbone from the
      alpha-carboxyl carbon of residue N, a lysine, to the alpha-amino nitrogen of
      residue N+2, a glycine, coupled with the formation of a double bond to the alpha-amino
      nitrogen of residue N+1 which loses one hydrogen, and the loss of a molecule
      of water. In addition, the residue N lysine undergoes cyclization. The alpha-amino
      nitrogen is replaced by the epsilon-amino nitrogen, the peptide chain is broken,
      residue N-1 is released as an amide, and a double bond is formed between the
      alpha-carbon and the nitrogen so that a tetrahydropyridine ring results. This
      cross-link is accompanied by modification of residue N+1. The modified residue
      N+1 is presented in a separate entry and is not included in the mass accounting
      of this entry. The backbone atoms of residue N+1 are shown in gray in the diagram.
      Generating Enzyme: autocatalytic.'
    synonyms:
    - 2-[(4Z)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-2-(3,4,5,6-tetrahydropyridin-2-yl)imidazol-1-yl]ethanoic
      acid
    - '[5-oxo-2-(3,4,5,6-tetrahydropyridin-2-yl)-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - '[(4z)-4-(4-hydroxybenzylidene)-5-oxo-2-(3,4,5,6-tetrahydropyridin-2-yl)-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    - Zoanthus sp. fluorescent protein zFP538 chromophore
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - 2-(3,4,5,6-tetrahydropyridin-2-yl)-1-carboxymethyl-1-imidazolin-5-one
    - '[(4Z)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-2-(3,4,5,6-tetrahydropyridin-2-yl)-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - KYG
    - 2-(tetrahydropyrid-2-yl)-5-imidazolinone glycine
    identifiers:
    - ns: pdb.ligand
      id: CH7
    - ns: resid
      id: AA0382
    - ns: pdb-ccd
      id: CH7
    - ns: mod
      id: MOD:00387
    - ns: go
      id: GO:0051362
    structure: OC(=O)CN1C(=O)CN=C1[C@@H]1CCCC[NH2+]1
    base_monomers:
    - K
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0051:
    id: AA0051
    name: N-acetyl-L-serine
    comments: 'Generating Enzyme: peptide alpha-N-acetyltransferase (EC 2.3.1.88).'
    synonyms:
    - N-acetyl-L-serine
    - N-acetylserine
    - 2-acetylazanyl-3-hydroxypropanoic acid
    - (2S)-2-acetamido-3-hydroxy-propanoic acid
    - (2S)-2-acetamido-3-hydroxypropanoic acid
    - 2-acetylamino-3-hydroxypropanoic acid
    - S
    - n-acetyl-serine
    identifiers:
    - ns: resid
      id: AA0051
    - ns: go
      id: GO:0017198
    - ns: pdb-ccd
      id: SAC
    - ns: chebi
      id: CHEBI:45441
    - ns: cas
      id: 16354-58-8
    - ns: mod
      id: MOD:00060
    structure: OC[C@@H](C(=O)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0127:
    id: AA0127
    name: pyruvic acid
    comments: The pyruvic acid forming an amide bond between its 1-carboxyl group
      and an amino terminal residue arises from oxidative deamination of an encoded
      amino acid, either cysteine or serine. It is important to distinguish this modification
      from an exogenous pyruvic acid forming a ketimine bond with its 2-keto group
      and an amino terminal residue (see RESID:AA0274 and RESID:AA0275).
    synonyms:
    - 2-oxopropanoic acid
    identifiers:
    - ns: pdb.ligand
      id: PYR
    - ns: resid
      id: AA0127
    - ns: mod
      id: MOD:00807
    - ns: cas
      id: 127-17-3
    - ns: go
      id: GO:0018058
    - ns: mod
      id: MOD:01661
    - ns: mod
      id: MOD:00136
    structure: OC(=O)C(=O)C
    base_monomers:
    - S
    - Y
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0392:
    id: AA0392
    name: S-galactosyl-L-cysteine
    comments: The beta form is shown. See also RESID:AA0152 and RESID:AA0560 for other
      S-glycosylated cysteines.
    synonyms:
    - (2R)-2-amino-3-(D-galactopyranosylsulfanyl)propanoic acid
    - S-(beta-D-galactopyranosyl)cysteine
    - S-glycosyl-cysteine
    identifiers:
    - ns: mod
      id: MOD:00799
    - ns: resid
      id: AA0392
    structure: OC[C@H]1O[C@@H](SC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@H]1O)O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0203:
    id: AA0203
    name: O4'-(phospho-5'-adenosine)-L-tyrosine
    synonyms:
    - (2S)-2-amino-3-[4-(5'-adenosine phosphonoxy)phenyl]propanoic acid
    - hydrogen 5'-adenylate tyrosine ester
    - O4'-L-tyrosine 5'-adenosine phosphodiester
    - 5'-adenylic-O-tyrosine
    identifiers:
    - ns: pdb.ligand
      id: AMP
    - ns: cas
      id: 93957-03-0
    - ns: resid
      id: AA0203
    - ns: go
      id: GO:0018254
    - ns: mod
      id: MOD:00208
    structure: OC(=O)[C@H](Cc1ccc(cc1)OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 40
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 40
    - molecule: Monomer
      element: H
      position: 40
      charge: 1
  AA0506:
    id: AA0506
    name: 7'-hydroxy-2'-alpha-mannosyl-L-tryptophan
    comments: The 7'-hydroxylation of tryptophan apparently makes it susceptible to
      oxidation and cross-linking, however these secondary products have not been
      characterized.
    synonyms:
    - (2S)-2-amino-3-[7-hydroxy-2-(alpha-D-mannopyranosyl)-1H-indol-3-yl]propanoic
      acid
    identifiers:
    - ns: mod
      id: MOD:01609
    - ns: resid
      id: AA0506
    structure: OC[C@H]1O[C@@H]([C@H]([C@H]([C@@H]1O)O)O)c1[nH]c2c(c1C[C@@H](C(=O)O)[NH3+])cccc2O
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
    - molecule: Monomer
      element: H
      position: 28
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    - molecule: Monomer
      element: H
      position: 29
      charge: 1
  AA0489:
    id: AA0489
    name: '[cyclo(prolylserin)-O-yl] cysteinate'
    comments: This diketopiperazine ester is formed by cyclization of the C-terminal
      seryl-proline dipeptide and transesterification to cysteine. Although it is
      constructed from three C-terminal amino acids, for simplicity it is represented
      in the UniProt feature as a modification of cysteine and not as a crosslink.
    synonyms:
    - (3,6-dioxopyrrolo[4,5-a]piperazin-2-yl)methyl cysteinate
    - '[(3S,8aS)-1,4-dioxooctahydropyrrolo[1,2-a]pyrazin-3-yl]methyl (2R)-2-amino-3-sulfanylpropanoate'
    identifiers:
    - ns: resid
      id: AA0489
    - ns: mod
      id: MOD:01436
    - ns: mod
      id: MOD:01437
    structure: SC[C@@H](C(=O)OC[C@@H]1NC(=O)[C@H]2N(C1=O)CCC2)N
    base_monomers:
    - P
    - S
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0066:
    id: AA0066
    name: N,N-dimethyl-L-proline
    comments: 'Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12 concerning
      calculation of the difference formula. Generating Enzyme: N-terminal RCC1 methyltransferase
      (EC 2.1.1.-).'
    synonyms:
    - stachydrin
    - (2S)-2-carboxy-1,1-dimethylpyrrolidinium
    - 1,1-dimethyl-L-prolinium
    - N,N-dimethyl-L-prolinium
    identifiers:
    - ns: go
      id: GO:0018016
    - ns: cas
      id: 51705-67-0
    - ns: mod
      id: MOD:00075
    - ns: pdb.ligand
      id: PBE
    - ns: chebi
      id: CHEBI:21451
    - ns: resid
      id: AA0066
    structure: OC(=O)[C@@H]1CCC[N]1(C)C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0373:
    id: AA0373
    name: L-aspartyl aldehyde
    synonyms:
    - L-aspartic beta-semialdehyde
    - L-aminosuccinic acid semialdehyde
    - L-beta-formylalanine
    - (S)-2-amino-4-oxobutanoic acid
    - L-aminosuccinaldehydic acid
    - L-aspartate-beta-semialdehyde
    identifiers:
    - ns: go
      id: GO:0051203
    - ns: mod
      id: MOD:00378
    - ns: resid
      id: AA0373
    - ns: cas
      id: 498-20-4
    structure: O=CC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0508:
    id: AA0508
    name: 6-(S-L-cysteinyl)-8alpha-(N3'-L-histidino)-FMN
    comments: 'The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - 6-(S-cysteinyl)-8alpha-(N(pi)-histidyl)-FMN
    - 6-((R)-2-amino-2-carboxyethyl)sulfanyl-8alpha-[4-((S)-2-amino-2-carboxyethyl)imidazol-3-yl]-riboflavin
      5'-trihydrogen phosphate
    - 6-(S-cysteinyl)-8alpha-(pros-histidyl)-FMN
    - 6-(S-cysteinyl)-8alpha-(N(delta)-histidyl)-FMN
    - 6-(S-cysteinyl)-8alpha-(N3'-histidyl)-FMN
    identifiers:
    - ns: mod
      id: MOD:01611
    - ns: resid
      id: AA0508
    structure: O=C[C@H](CS[C@@H]1C(=C(C=C2C1=N[C@@H]1C(=O)NC(=O)N=C1N2C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)Cn1cncc1C[C@@H](C(=O)O)[NH3+])C)[NH3+]
    base_monomers:
    - C
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 50
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 53
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 52
    - molecule: Monomer
      element: H
      position: 52
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 53
    - molecule: Monomer
      element: H
      position: 53
      charge: 1
  AA0199:
    id: AA0199
    name: D-threonine
    comments: 'Generating Enzyme: protein-threonine 2-epimerase (EC 5.1.1.-).'
    synonyms:
    - (2R,3R)-2-amino-3-hydroxybutanoic acid
    identifiers:
    - ns: mod
      id: MOD:00863
    - ns: chebi
      id: CHEBI:32826
    - ns: cas
      id: 632-20-2
    - ns: pdb.ligand
      id: DTH
    - ns: resid
      id: AA0199
    structure: C[C@H]([C@H](C(=O)O)[NH3+])O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0041:
    id: AA0041
    name: N-acetyl-L-alanine
    comments: 'Generating Enzyme: peptide alpha-N-acetyltransferase (EC 2.3.1.88);
      ribosomal-protein-alanine N-acetyltransferase (EC 2.3.1.128).'
    synonyms:
    - (2S)-2-acetamidopropanoic acid
    - 2-(acetylazanyl)propanoic acid
    - 2-(acetylamino)propanoic acid
    - N-acetyl-L-alanine
    - n-acetylalanine
    - (2S)-2-(acetamido)propanoic acid
    - A
    - acetylalanine
    identifiers:
    - ns: go
      id: GO:0017189
    - ns: mod
      id: MOD:00050
    - ns: pdb-ccd
      id: AYA
    - ns: chebi
      id: CHEBI:61920
    - ns: resid
      id: AA0041
    - ns: cas
      id: 97-69-8
    structure: CC(=O)N[C@H](C(=O)O)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0040:
    id: AA0040
    name: 2'-[3-carboxamido-3-(trimethylammonio)propyl]-L-histidine
    comments: 'Diphthamide appears to occur uniquely in translation elongation factor
      eEF-2. Generating Enzyme: diphthine synthase Dph5 (EC 2.1.1.98); diphthine--ammonia
      ligase (EC 6.3.2.22); diphthamide biosynthesis protein, histidine 3-carboxy-3-aminopropyltransferase
      (EC 2.5.1.-).'
    synonyms:
    - (2R)-1-amino-4-{4-[(2S)-2-amino-2-carboxyethyl]-1H-imidazol-2-yl}-N,N,N-trimethyl-1-oxobutan-2-aminium
    - (2R)-1-amino-4-(4-[(2S)-2-amino-2-carboxyethyl]-1H-imidazol-2-yl)-N,N,N-trimethyl-1-oxobutan-2-aminium
    - 2-amino-3-[[2-(3-amino-3-carbamoyl-prop-1-enyl)-1,1,3-trimethyl-2,3-dihydroimidazol-5-yl]]propanoic
      acid
    - alpha-(aminocarbonyl)-4-(2-amino-2-carboxyethyl)-N,N,N-trimethyl-1H-imidazole-2-propanaminium
    - 2-amino-4-[[5-(2-amino-2-carboxylato-ethyl)-1,1,3-trimethyl-2,3-dihydroimidazol-2-yl]]but-3-enamide
    - 2-[3-carboxamido-3-(trimethylammonio)propyl]histidine
    - '[(2R)-1-amino-4-[4-[(2S)-2-amino-3-hydroxy-3-oxo-propyl]-1H-imidazol-2-yl]-1-oxo-butan-2-yl]-trimethyl-azanium'
    - H
    - diphthamide
    - 2-[(R)-3-carboxamido-3-(trimethylammonio)propyl]-4-((S)-2-amino-2-carboxyethyl)-1H-imidazole
    - (3-[4-(2-amino-2-carboxy-ethyl)-1H-imidazol-2-yl]-1-carbamoyl-propyl)-trimethylammonium
    - '{3-[4-(2-amino-2-carboxy-ethyl)-1h-imidazol-2-yl]-1-carbamoyl-propyl}-trimethyl-ammonium'
    - 1-azanyl-4-(4-[2-azanyl-2-carboxyethyl]-1H-imidazol-2-yl)-N,N,N-trimethyl-1-oxobutan-2-azanium
    identifiers:
    - ns: go
      id: GO:0006471
    - ns: pdb.ligand
      id: DDE
    - ns: resid
      id: AA0040
    - ns: cas
      id: 75645-22-6
    - ns: chebi
      id: CHEBI:16692
    - ns: mod
      id: MOD:00049
    - ns: pdb-ccd
      id: DDE
    structure: N[C@H](C(=O)O)Cc1c[nH]c(n1)CC[C@@H]([N](C)(C)C)C(=O)N
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0561:
    id: AA0561
    name: S-(2-succinyl)-L-cysteine
    comments: 'This modification is produced in the active site inhibition of glyceraldehyde-3-phosphate
      dehydrogenase by fumarate, but as the active site intermediate in maleate isomerase.
      Generating Enzyme: autocatalytic.'
    synonyms:
    - (2R)-2-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}butanedioic acid
    - 2-amino-3-(1,2-dicarboxyethylthio)propanoic acid
    - S-(2-succinyl)cysteine
    - (2R)-2-amino-3-([(1R)-1,2-dicarboxyethyl]sulfanyl)propanoic acid
    - 2-((2-amino-2-carboxyethyl)thio)butanedioic acid
    - S-[(2R)-2-succinyl]-L-cysteine
    - S-(1,2-dicarboxyethyl)cysteine
    identifiers:
    - ns: mod
      id: MOD:01889
    - ns: pdb.ligand
      id: SIN
    - ns: cas
      id: 34317-60-7
    - ns: resid
      id: AA0561
    structure: O=C[C@H](CS[C@@H](C(=O)[O-])CC(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0400:
    id: AA0400
    name: O-galactosyl-L-serine
    comments: 'See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0402, RESID:AA0404,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: galactosyltransferase (EC 2.4.1.-).'
    synonyms:
    - (2S)-2-amino-3-(alpha-D-galactopyranosyloxy)propanoic acid
    - O3-galactosylserine
    - O-glycosylserine
    identifiers:
    - ns: resid
      id: AA0400
    - ns: mod
      id: MOD:00808
    structure: OC[C@H]1O[C@H](OC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@H]1O)O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0617:
    id: AA0617
    name: S-(poly-3-hydroxybutyrate)-L-cysteine
    comments: 'The mechanism of biosynthesis may involve transfer of the polymer to
      and from a noncovalently bound coenzyme A. The intermediate modification with
      two polymeric units is presented. Generating Enzyme: autocatalytic.'
    synonyms:
    - S-poly[(R)-3-hydroxybutyrate]cysteine
    - S-poly(3-hydroxybutanoic acid)cysteine
    - (alpha)-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-(omega)-[(3R)-3-hydroxybutanoyl]-poly([(3R)-3-methyl-1-oxopropane-1,3-diyl]oxy)
    - S-poly(3-hydroxybutanoate)cysteine
    - S-poly(beta-hydroxybutyrate)cysteine
    - S-poly(3-hydroxybutyrate)cysteine
    - S-poly(3-hydroxybutyric acid)cysteine
    identifiers:
    - ns: cas
      id: 29435-48-1
    - ns: mod
      id: MOD:01975
    - ns: resid
      id: AA0617
    structure: C[C@H](CC(=O)O[C@@H](CC(=O)SC[C@@H](C(=O)O)N)C)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
  AA0512:
    id: AA0512
    name: glycyl cysteine dithioester
    comments: These are highly reactive dithioester cross-links formed between internal
      cysteine residues of ThiF and the carboxyl end of ThiS and other similar proteins.
    synonyms:
    - S-glycyl thiocysteine
    - S-glycyl cysteine persulfide
    - 2-(glycyldithio)alanine
    - (2R)-2-amino-3-[(aminoacetyl)disulfanyl]propanoic acid
    - thioglycine cysteine disulfide
    identifiers:
    - ns: mod
      id: MOD:01615
    - ns: resid
      id: AA0512
    structure: OC(=O)[C@@H]([NH3+])CSSC(=O)C[NH3+]
    base_monomers:
    - C
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0317:
    id: AA0317
    name: 1'-methyl-L-histidine
    comments: 'In the older biochemical literature this is usually called 3-methylhistidine.
      See also RESID:AA0073. The crystallographic designation for the substituted
      nitrogen is epsilon-2, E2. Generating Enzyme: protein-histidine N-methyltransferase
      (EC 2.1.1.85).'
    synonyms:
    - tele-methylhistidine
    - 1-methyl-L-histidine
    - 4-methyl-histidine
    - 3-methylhistidine [misnomer]
    - H
    - (S)-2-amino-3-(1-methyl-1H-imidazol-4-yl)propanoic acid
    - (2S)-2-amino-3-(1-methylimidazol-4-yl)propanoic acid
    - 4-methyl-histidine [misnomer]
    - N(tau)-methylhistidine
    - N(epsilon)-methylhistidine
    identifiers:
    - ns: mod
      id: MOD:00322
    - ns: pdb-ccd
      id: HIC
    - ns: cas
      id: 332-80-9
    - ns: resid
      id: AA0317
    - ns: chebi
      id: CHEBI:16367
    - ns: go
      id: GO:0018021
    - ns: pdb.ligand
      id: HIC
    structure: Cn1cc(nc1)C[C@H]([NH3+])C(=O)O
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0449:
    id: AA0449
    name: (3R,4R)-4,5-dihydroxyisoleucine
    comments: In peptide sequencing work prior to 1968, this modification was reported
      as a beta-methylleucine derivative that could arise by either beta-methylation
      of leucine or gamma-methylation of isoleucine. The correct structure has been
      determined to be derived from isoleucine without methylation.
    synonyms:
    - I
    - (3R,4R)-4,5-dihydroxyisoleucine
    - (2S,3R,4R)-2-amino-4,5-dihydroxy-3-methylpentanoic acid
    - gamma,delta-dihydroxyisoleucine
    - 4,5-dihydroxyisoleucine
    - (2S,3R,4R)-2-amino-4,5-dihydroxy-3-methyl-pentanoic acid
    - (2S,3R,4R)-2-amino-4,5-dihydroxy-3-methylpentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: ILX
    - ns: mod
      id: MOD:01378
    - ns: resid
      id: AA0449
    - ns: pdb.ligand
      id: ILX
    structure: OC[C@@H]([C@@H]([C@@H](C(=O)O)[NH3+])C)O
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0579:
    id: AA0579
    name: (2S,3S)-3-hydroxyaspartic acid
    comments: 'This diastereomeric form has been found in the ankyrin repeat domain
      of many proteins. For the (2S,3R)-diastereomer, see RESID:AA0027. Generating
      Enzyme: hypoxia-inducible factor-asparagine dioxygenase (EC 1.14.11.30).'
    synonyms:
    - D
    - (2S,3S)-2-azanyl-3-oxidanyl-butanedioic acid
    - (2S,3S)-2-amino-3-hydroxybutanedioic acid
    - (3S)-3-hydroxy-L-aspartic acid
    - (3s)-3-hydroxy-l-aspartic acid
    - 2-amino-3-hydroxysuccinic acid
    - L-threo-beta-hydroxyaspartic acid
    - L-threo-3-hydroxyaspartic acid
    - 3-hydroxyaspartic acid
    - 2-azanyl-3-hydroxybutanedioic acid
    identifiers:
    - ns: mod
      id: MOD:01919
    - ns: chebi
      id: CHEBI:10696
    - ns: pdb-ccd
      id: BHD
    - ns: cas
      id: 7298-99-9
    - ns: pdb.ligand
      id: BHD
    - ns: resid
      id: AA0579
    structure: O=C[C@H]([C@@H](C(=O)[O-])O)[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0431:
    id: AA0431
    name: 1'-(1,2,3-trihydroxyprop-2-yl)-L-histidine
    synonyms:
    - (S)-2-amino-3-[1-(1,2,3-trihydroxypropan-2-yl)-1H-imidazol-4-yl]propanoic acid
    - H
    - N(epsilon)-histidine dihydroxyacetone adduct
    - 1-[1,2-dihydroxy-1-(hydroxymethyl)ethyl]-l-histidine
    - N(tau)-(1,2,3-trihydroxypropan-2-yl)histidine
    - tele-(1,2,3-trihydroxypropan-2-yl)histidine
    - 1-[1,2-dihydroxy-1-(hydroxymethyl)ethyl]-L-histidine
    - (2S)-2-amino-3-[1-(1,2,3-trihydroxypropan-2-yl)imidazol-4-yl]propanoic acid
    identifiers:
    - ns: pdb.ligand
      id: HIQ
    - ns: mod
      id: MOD:00160
    - ns: resid
      id: AA0431
    - ns: mod
      id: MOD:01177
    - ns: pdb-ccd
      id: HIQ
    structure: OCC(n1cnc(c1)C[C@@H](C(=O)O)[NH3+])(CO)O
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0343:
    id: AA0343
    name: N-carbamoyl-L-alanine
    comments: Carbamoylation of the alpha-amino group can be artifactual, especially
      when urea buffers are used.
    synonyms:
    - 2-ureidopropanoic acid
    - N-carbamylalanine
    - (S)-2-(carbamoylamino)propanoic acid
    identifiers:
    - ns: mod
      id: MOD:00348
    - ns: resid
      id: AA0343
    - ns: go
      id: GO:0046945
    structure: NC(=O)N[C@H](C(=O)O)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0451:
    id: AA0451
    name: 2'-(S-L-cysteinyl)-6'-hydroxy-L-tryptophan sulfoxide
    synonyms:
    - 3-(oxidosulfanyl)-L-alanine
    - C
    - 6'-hydroxy-S-oxo-tryptathionine
    - 2-((2R)-2-amino-2carboxyethyl)sulfinyl-3-((2S)-2-amino-2-carboxyethyl)-1H-indole
    - s-oxy cysteine
    identifiers:
    - ns: mod
      id: MOD:01380
    - ns: resid
      id: AA0451
    - ns: pdb.ligand
      id: CSX
    - ns: pdb-ccd
      id: CSX
    structure: O=C[C@H](Cc1c([nH]c2c1ccc(c2)O)[S@](=O)C[C@@H](C(=O)O)N)[NH3+]
    base_monomers:
    - W
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
  AA0493:
    id: AA0493
    name: N-(dihydroxymethyl)-L-methionine
    comments: 'The formyl group of N-formylmethionine, as an aldehyde, may undergo
      spontaneous addition of water to form a dihydoxymethyl group. It is detectable
      by mass spectrometry and other methods. Although appropriate, the keyword "thioether
      bond" normally does not appear for this amino acid. Generating Enzyme: methionine--tRNA
      ligase (EC 6.1.1.10); methionyl-tRNA formyltransferase (EC 2.1.2.9).'
    synonyms:
    - N-formyl-L-methionine hydrate
    - N-orthoformylmethionine
    - (2S)-2-[(dihydroxymethyl)amino]-4-(methylsulfanyl)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:01446
    - ns: resid
      id: AA0493
    - ns: mod
      id: MOD:01447
    - ns: pdb.ligand
      id: CXM
    structure: CSCC[C@@H](C(=O)O)NC(O)O
    base_monomers:
    - M
    - AA0021
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0362:
    id: AA0362
    name: O-sulfo-L-threonine
    synonyms:
    - threonine sulfate ester
    - O3-sulfothreonine
    - O3-sulfonothreonine
    - 2-amino-3-hydroxybutanoic acid 3-sulfate
    - (2S,3R)-2-amino-3-(sulfooxy)butanoic acid
    identifiers:
    - ns: resid
      id: AA0362
    - ns: mod
      id: MOD:00367
    - ns: go
      id: GO:0050985
    structure: OC(=O)[C@H]([C@H](OS(=O)(=O)[O-])C)[NH3+]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0112:
    id: AA0112
    name: 3-methyl-L-lanthionine
    comments: "There are 3 chiral centers, so there are 8 possible stereoisomers.\
      \ Bacterial peptidyl-cysteine dehydroalanine/dehydrobutyrine ligase and peptide\
      \ conformation preferentially produce the (2S,3S,2'R) diastereomer. The cysteine\
      \ maintains its L configuration (R chirality), while the threonine 2-aminobutanoate\
      \ skeleton has a D configuration (S chirality). For the (2R,3R,2'R) diastereomer,\
      \ see RESID:AA0610. Generating Enzyme: peptidyl-phosphoserine/phosphothreonine\
      \ dehydratase (EC 4.2.1.-); peptidyl-cysteine dehydroalanine/dehydrobutyrine\
      \ ligase (EC 6.2.-.-)."
    synonyms:
    - 3-methyl-D,L-lanthionine
    - (2S,3S,6R)-2,6-diamino-3-methyl-4-thiaheptanedioic acid
    - cysteine-3-D-butyrine thioether
    - (2S,3S,2'R)-2-amino-3-[(2-amino-2-carboxyethyl)thio]butanoic acid
    - (2S-[2R*,3R*(S*)])-2-amino-3-[(2-amino-2-carboxyethyl)thio]butanoic acid
    - (2S,3S,6R)-3-methyllanthionine
    - (2S,3S)-2-amino-3-([(2R)-2-amino-2-carboxyethyl]sulfanyl)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:00121
    - ns: cas
      id: 42849-28-5
    - ns: pdb.ligand
      id: DBB
    - ns: go
      id: GO:0018081
    - ns: resid
      id: AA0112
    - ns: chebi
      id: CHEBI:20118
    structure: O=C[C@H](CS[C@H]([C@H](C(=O)O)[NH3+])C)[NH3+]
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0214:
    id: AA0214
    name: L-citrulline
    comments: 'Generating Enzyme: protein-arginine deiminase (EC 3.5.3.15).'
    synonyms:
    - N5-carbamylornithine
    - N~5~-carbamoyl-L-ornithine
    - alpha-amino-delta-ureidovaleric acid
    - delta-ureidonorvaline
    - N5-carbamoylornithine
    - (2S)-5-(aminocarbonylamino)-2-azanyl-pentanoic acid
    - R
    - (S)-2-amino-5-(carbamoylamino)pentanoic acid
    - citrulline
    - 2-amino-5-(aminocarbonyl)aminopentanoic acid
    - N5-(aminocarbonyl)ornithine
    identifiers:
    - ns: mod
      id: MOD:00219
    - ns: pdb.ligand
      id: CIR
    - ns: cas
      id: 372-75-8
    - ns: pdb-ccd
      id: CIR
    - ns: go
      id: GO:0018101
    - ns: resid
      id: AA0214
    structure: NC(=O)NCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0185:
    id: AA0185
    name: L-3-oxoalanine
    comments: 'The modified cysteine is found in sulfatases at the second position
      in the sequence motif [L/V]C[A/C/S/T]PSR. In at least one case, the oxidation
      acceptor or cofactor for the generating enzyme is known to be S-adenosylmethionine.
      The generating enzyme activity acting on serine would be EC 1.1.99.-, and acting
      on cysteine would be EC 1.8.99.-. This modification should not be confused with
      N-formylglycine (see RESID:AA0057). The use of the misleading, non-standard
      name "C-alpha-formyl glycine" should be avoided. This active site residue occurs
      in the hydrated form, 2-amino-3,3-dihydroxypropanoic acid, as observed in crystallographic
      structures.  See RESID:AA0492. The PDB Hetgroup FGL was originally designated
      as the "C(alpha)-formyl glycine" active site residue L-3-oxoalanine observed
      in its hydrated form. That structure, a gem-diol with an sp(3) carbon, was misinterpreted
      as a carboxyl with an sp(2) carbon, and assigned to aminomalonic acid (see RESID:AA0458)
      instead. Generating Enzyme: sulfatase maturing enzyme (sulfatase modifying factor,
      C-alpha-formylglycine-generating enzyme) (EC 1.1.99.-) #link SER; sulfatase
      maturing enzyme (sulfatase modifying factor, C-alpha-formylglycine-generating
      enzyme) (EC 1.8.99.-) #link CYS.'
    synonyms:
    - L-amino-malonic acid semialdehyde
    - 2-amino-3-oxopropionic acid
    - G
    - 2-aminopropanedioic acid
    - L-aminomalonaldehydic acid
    - L-serinesemialdehyde [misnomer]
    - (S)-2-amino-3-oxopropanoic acid
    - aminopropanedioic acid
    - C(alpha)-formylglycine [misnomer]
    identifiers:
    - ns: cas
      id: 5735-66-0
    - ns: go
      id: GO:0018083
    - ns: pdb.ligand
      id: FGL
    - ns: mod
      id: MOD:00193
    - ns: mod
      id: MOD:00835
    - ns: pdb-ccd
      id: FGL
    - ns: resid
      id: AA0185
    structure: O=CC(C(=O)O)N
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  AA0386:
    id: AA0386
    name: O-octanoyl-L-threonine
    comments: 'Generating Enzyme: ghrelin O-acyltransferase, GOAT (EC 2.3.1.-).'
    synonyms:
    - L-threonine octanoate ester
    - (2S)-2-amino-3-(octanoyloxy)butanoic acid
    - O3-octanoyl-L-threonine
    identifiers:
    - ns: mod
      id: MOD:00391
    - ns: resid
      id: AA0386
    - ns: go
      id: GO:0042050
    structure: C[C@H]([C@H]([NH3+])C(=O)O)OC(=O)CCCCCCC
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0181:
    id: AA0181
    name: dehydroalanine
    comments: 'The modification of serine to dehydroalanine coupled with the formation
      of 5-imidazolinone by the two neighboring residues produces the 4-methylidene-imidazole-5-one
      (MIO) active site of some amino acid ammonia-lyases that differs by UV and mass
      spectrometric evidence from other known dehydroalanine containing peptides not
      containing the second modification. The formation of iodinated thyronine, O-(4-hydroxyphenyl)-tyrosine,
      by phenoxy radical transfer from tyrosine in thyroglobulin produces dehydroalanine
      as a by-product. See RESID:AA0177 and RESID:AA0178. The formation of S-(2-aminovinyl)-L-cysteine,
      see RESID:AA0548, requires that an interior cysteine first undergoes oxidative
      dethiolation to form dehydroalanine. This reaction is normally followed by formation
      of an L-lanthionine through reformation of an L-cysteine in a thioether bond
      with the C-terminal cysteine. The C-terminal cysteine is subsequently decarboxylated.
      Because the intermediate dehydroalanine formed from cysteine is not normally
      observed, it is not annotated as a feature in UniProt. Either free or in a peptide
      chain, dehydroalanine is unstable, undergoing hydrolysis with formation of 2-hydroxyalanine
      which can, like 2-hydroxyglycine (see RESID:AA0434), decompose by deamination
      breaking the peptide backbone to form a peptide amide and a pyruvoyl peptide
      (see RESID:AA0127). A 2,3-didehydro amino acid blocks Edman degradation. Generating
      Enzyme: protein-cysteine dethiolase (EC 4.4.1.-) #link CYS; autocatalytic #link
      SEC; protein-serine dehydratase (EC 4.2.1.-) #link SER.'
    synonyms:
    - 2,3-didehydroalanine
    - 2-aminopropenoic acid
    - anhydroserine
    - 2-aminoacrylic acid
    - 4-methylidene-imidazole-5-one (MIO) active site
    - Dha
    identifiers:
    - ns: go
      id: GO:0018250
    - ns: pdb.ligand
      id: DHA
    - ns: resid
      id: AA0181
    - ns: chebi
      id: CHEBI:17123
    - ns: mod
      id: MOD:00824
    - ns: mod
      id: MOD:00793
    - ns: cas
      id: 1948-56-7
    - ns: mod
      id: MOD:01954
    - ns: mod
      id: MOD:00189
    structure: NC(=C)C(=O)O
    base_monomers:
    - U
    - S
    - Y
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0296:
    id: AA0296
    name: O-(N-acetylglucosamine-1-phosphoryl)-L-serine
    comments: 'See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0402, RESID:AA0404,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: UDP-N-acetylglucosamine:serine-protein N-acetylglucosamine-1-phosphotransferase
      (EC 2.7.8.-).'
    synonyms:
    - O3-(N-acetylglucosamine-1-phosphoryl)-L-serine
    - O3-L-serine 2-(acetylamino)-2-deoxy-D-glucopyranose 1-phosphodiester
    - O-beta(N-acetyl-glucosamine-alpha1-phosphate)serine
    - (2S)-2-amino-3-[([(2-acetamido-2-deoxy-alpha-D-glucopyranosyl)oxy][hydroxy]phosphoryl)oxy]propanoic
      acid
    identifiers:
    - ns: mod
      id: MOD:00301
    - ns: go
      id: GO:0018425
    - ns: cas
      id: 6866-69-9
    - ns: resid
      id: AA0296
    structure: OC[C@H]1O[C@H](OP(=O)(OC[C@@H](C(=O)O)[NH3+])[O-])[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0581:
    id: AA0581
    name: L-methionine sulfoxide
    comments: 'The S-oxide of methionine is a chiral center. The oxidized methionine
      in actin has been determined to be the (R)-sulfoxide. The methionine (R)-sulfoxides
      in actin can be reduced to methionine by methionine-R-sulfoxide reductase B1,
      MsrB1 (EC 1.8.4.-). Generating Enzyme: protein-methionine sulfoxide oxidase
      Mical1 (EC 1.14.13.-).'
    synonyms:
    - (2S)-2-amino-4-[(R)-methylsulfinyl]butanoic acid
    - M
    - methionine sulfoxide
    - L-methionine (R)-S-oxide
    identifiers:
    - ns: mod
      id: MOD:00721
    - ns: pdb.ligand
      id: SME
    - ns: resid
      id: AA0581
    - ns: pdb-ccd
      id: SME
    - ns: cas
      id: 3226-66-2
    - ns: chebi
      id: CHEBI:45764
    structure: C[S@@](=O)CC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0374:
    id: AA0374
    name: L-serine microcin E492 siderophore ester
    synonyms:
    - N-[5-(6-O-seryl-beta-glucosyl)-2,3-dihydroxybenzoyl]-O-[N-(2,3-dihydroxybenzoyl)-O-[N-(2,3-dihydroxybenzoyl)seryl]seryl]serine
    identifiers:
    - ns: mod
      id: MOD:00379
    - ns: resid
      id: AA0374
    - ns: go
      id: GO:0051263
    structure: OC[C@@H](C(=O)OC[C@@H](C(=O)OC[C@@H](C(=O)[O-])NC(=O)c1cc(cc(c1O)O)[C@@H]1O[C@H](COC(=O)[C@H](CO)N)[C@H]([C@@H]([C@H]1O)O)O)NC(=O)c1cccc(c1O)O)NC(=O)c1cccc(c1O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
  AA0252:
    id: AA0252
    name: dipyrrolylmethanemethyl-L-cysteine
    comments: The pyrromethane cofactor is synthesized on the enzyme autocatalytically
      by condensation of two porphobilinogen molecules.
    synonyms:
    - (2S)-3-[5-[4-(2-carboxy)ethyl-3-carboxymethyl-1-pyrrol-2-yl]methyl-4-(2-carboxy)ethyl-3-carboxymethyl-1-pyrrol-2-yl]methylthio-2-aminopropanoic
      acid
    - pyrromethane cofactor
    - 3-[5-(3-acetic acid-4-propanoic acid-1-pyrrol-2-yl)methyl-3-acetic acid-4-propanoic
      acid-1-pyrrol-2-yl]methylthio-2-aminopropanoic acid
    - dipyrrolylmethyl-L-cysteine
    - dipyrromethane cofactor
    - dipyrrole cofactor
    identifiers:
    - ns: chebi
      id: CHEBI:23842
    - ns: mod
      id: MOD:00257
    - ns: resid
      id: AA0252
    - ns: cas
      id: 29261-13-0
    - ns: pdb.ligand
      id: DPM
    - ns: go
      id: GO:0018160
    structure: O=C[C@H](CSCc1[nH]c(c(c1CC(=O)[O-])CCC(=O)[O-])Cc1[nH]cc(c1CC(=O)[O-])CCC(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0427:
    id: AA0427
    name: S-phycourobilin-L-cysteine
    comments: There are additional chiral centers at C-3alpha, C-4, and C-16.
    synonyms:
    - phycourobilin cysteine adduct
    - 18-ethenyl-3-[1-(2-amino-2-carboxyethylsulfanyl)ethyl]-2,3,15,16-dihydro-2,7,13,17-tetramethyl-1,19-dioxo-(21H,22H,24H)-bilin-8,12-dipropanoic
      acid
    - PUB
    - (2S,3R,16R)-18-ethenyl-3-[(1R)-1-([(R)-2-amino-2-carboxyethyl]sulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-2,7,13,17-tetramethyl-4,5,15,16-tetrahydrobiline-1,19(21H,22H,24H)-dione
    identifiers:
    - ns: mod
      id: MOD:01175
    - ns: cas
      id: 61932-71-6
    - ns: resid
      id: AA0427
    structure: O=C[C@H](CS[C@@H](C1=C(C)C(=O)N[C@H]1Cc1[nH]c(c(c1C)CCC(=O)[O-])Cc1[nH]c(c(c1CCC(=O)[O-])C)C[C@H]1NC(=O)C(=C1C)C=C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0169:
    id: AA0169
    name: S-(ADP-ribosyl)-L-cysteine
    comments: 'The anomeric form of the pertussis toxin product has not been characterized;
      the alpha form is presented. The keywords "phosphoprotein" and "thioether bond"
      are not used with toxin modification. Generating Enzyme: NAD(P)+--cysteine ADP-ribosyltransferase
      (EC 2.4.2.-).'
    synonyms:
    - S-alpha-D-ribofuranosyl-L-cysteine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    - (R)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]sulfanyl)propanoic
      acid
    - S-L-cysteine alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    identifiers:
    - ns: go
      id: GO:0006471
    - ns: resid
      id: AA0169
    - ns: mod
      id: MOD:00178
    structure: OC(=O)[C@H](CS[C@@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 51
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 51
    - molecule: Monomer
      element: H
      position: 51
      charge: 1
  AA0083:
    id: AA0083
    name: L-asparagine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-aminobutanediamide
    - asparaginamide
    identifiers:
    - ns: mod
      id: MOD:00092
    - ns: go
      id: GO:0018036
    - ns: resid
      id: AA0083
    - ns: chebi
      id: CHEBI:21243
    - ns: cas
      id: 16748-73-5
    - ns: pdb.ligand
      id: NH2
    structure: NC(=O)C[C@@H](C(=O)N)[NH3+]
    base_monomers:
    - N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  F, Y, Y:
    id: AA0595
    name: coelenterazine
    comments: The structure of the amino acid components of coelenterazine suggest
      that it is biosynthesized from a phenylalanyl-tyrosyl-tyrosine peptide. This
      entry presents coelenterazine as a modification produced by the cross-linking
      of a tripeptide precursor. For coelenterazine as a heterogen cross-linked to
      a cysteine see RESID:AA0526.
    synonyms:
    - 8-benzyl-2-(4-hydroxybenzyl)-6-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-3(7H)-one
    - Oplophorus luciferin
    identifiers:
    - ns: cas
      id: 55779-48-1
    - ns: mod
      id: MOD:01949
    - ns: chebi
      id: CHEBI:2311
    - ns: resid
      id: AA0595
    structure: Oc1ccc(cc1)Cc1nc2n(c1=O)cc([nH]c2Cc1ccccc1)c1ccc(cc1)O
    base_monomers:
    - F
    - Y
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
  AA0484:
    id: AA0484
    name: L-phenylalanine thiazoline-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue. Generating Enzyme: peptidyl-cysteine cyclase (EC 4.2.1.-).'
    synonyms:
    - (4R)-2-[(1S)-1-amino-2-phenylethyl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    - 2-[1-azanyl-2-phenylethyl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0484
    - ns: mod
      id: MOD:01407
    structure: '[NH3+][C@H]([C@H]1SC[C@H](N1)C(=O)O)Cc1ccccc1'
    base_monomers:
    - F
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  E, N:
    id: AA0593
    name: 2-(2-aminosuccinimidyl)pentanedioic acid
    comments: 'This cross-link is formed by the condensation of an aspartic acid or
      asparagine residue with the alpha-amido of the following residue. Generating
      Enzyme: autocatalytic.'
    synonyms:
    - (4S)-4-[(3S)-3-amino-2,5-dioxopyrrolidin-1-yl]-5-oxopentanoic acid
    - aspartimide glutamic acid
    identifiers:
    - ns: mod
      id: MOD:01941
    - ns: mod
      id: MOD:01940
    - ns: pdb.ligand
      id: SNN
    - ns: resid
      id: AA0593
    structure: O=C[C@@H](N1C(=O)C[C@@H](C1=O)N)CCC(=O)[O-]
    base_monomers:
    - N
    - D
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0529:
    id: AA0529
    name: N-(glycyl)-L-cysteine
    comments: This modified carboxyl end glycine residue is produced by transamidation
      of S-(glycyl)-L-cysteine (see RESID:AA0206) transiently forming a peptide bond
      to a free cysteine before the cysteine is released by a peptidase activity.
    synonyms:
    - (2R)-2-[(aminoacetyl)amino]-3-sulfanylpropanoic acid
    - N-(2-amino-1-oxoethyl)cysteine
    identifiers:
    - ns: mod
      id: MOD:01778
    - ns: resid
      id: AA0529
    structure: SC[C@@H](C(=O)[O-])NC(=O)C[NH3+]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0557:
    id: AA0557
    name: L-cysteine sulfinyl phosphate
    comments: This modification is probably produced as an intermediate during the
      ATP mediated reduction of cysteine sulfinic acid (see RESID:AA0262) formed in
      some proteins during oxidative stress.
    synonyms:
    - (2R)-2-amino-3-[(phosphonooxy)sulfinyl]propanoic acid
    - cysteine sulfinic phosphoryl ester
    identifiers:
    - ns: resid
      id: AA0557
    - ns: mod
      id: MOD:01847
    structure: O[S@](OP(=O)(O)O)C[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0478:
    id: AA0478
    name: (2S,3S)-3-hydroxyasparagine
    comments: 'This diastereomeric form has been found in the C-terminal transactivation
      domain (CAD) of hypoxia-inducible factor (HIF), and in the ankyrin repeat domains
      of notch 1, which probably also contains the other diastereomeric form of the
      modification in its EGF domains. The PDB group code includes models with both
      the (2S,3R) and the (2S,3S) stereoconfiguration. Generating Enzyme: hypoxia-inducible
      factor-asparagine dioxygenase (EC 1.14.11.30).'
    synonyms:
    - (2S,3S)-2,4-diamino-3-hydroxy-4-oxobutanoic acid
    - (2S,3S)-2-amino-3-hydroxy-4-butanediamic acid
    - L-threo-beta-hydroxyasparagine
    identifiers:
    - ns: chebi
      id: CHEBI:50789
    - ns: mod
      id: MOD:01401
    - ns: resid
      id: AA0478
    - ns: pdb.ligand
      id: AHB
    structure: OC(=O)[C@H]([C@@H](C(=O)N)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0619:
    id: AA0619
    name: N,N,N-trimethylglyine
    comments: 'This modification is the major post-translational modification in the
      methylation of N-terminal glycine. See also RESID:AA0063 and RESID:AA0620. Consult
      FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12 concerning calculation
      of the difference formula. It is not clear whether "N-terminal methyltransferase"
      defined in EC 2.1.1.244 is intended to exclude an enzyme activity that methylates
      N-terminal glycine, or whether there are distinguishable enzyme activities.
      Generating Enzyme: protein N-terminal methyltransferase (EC 2.1.1.244).'
    synonyms:
    - 2-trimethylammonioacetate
    - carboxymethyl-trimethylazanium
    - N,N,N-trimethylglycinium
    - 1-carboxy-N,N,N-trimethylmethanazanium
    - betaine
    - carboxy-N,N,N-trimethylmethanaminium
    - N,N,N-trimethylglycine cation
    - (trimethylammonio)ethanoic acid
    - glycine betaine
    identifiers:
    - ns: cas
      id: 107-43-7
    - ns: resid
      id: AA0619
    - ns: mod
      id: MOD:01982
    - ns: chebi
      id: CHEBI:17750
    structure: OC(=O)C[N](C)(C)C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0423:
    id: AA0423
    name: O-acetyl-L-threonine
    comments: O-acetylation of threonine in host kinases is catalyzed by yersinia
      toxin blocking the normal phosphorylation.
    synonyms:
    - O-acetylthreonine
    - (2S,3R)-3-(acetyloxy)-2-aminobutanoic acid
    - threonine acetate ester
    identifiers:
    - ns: resid
      id: AA0423
    - ns: mod
      id: MOD:01171
    - ns: cas
      id: 17012-42-9
    - ns: pdb.ligand
      id: TH5
    structure: CC(=O)O[C@@H]([C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0401:
    id: AA0401
    name: O-galactosyl-L-threonine
    comments: 'See also RESID:AA0155, RESID:AA0247, RESID:AA0399, RESID:AA0403, RESID:AA0405,
      and RESID:AA0515 for other O-glycosylated threonines. Generating Enzyme: galactosyltransferase
      (EC 2.4.1.-).'
    synonyms:
    - O-glycosylthreonine
    - O3-galactosylthreonine
    - (2S,3R)-2-amino-3-(alpha-D-galactopyranosyloxy)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:00809
    - ns: resid
      id: AA0401
    structure: OC[C@H]1O[C@H](O[C@@H]([C@@H](C(=O)O)[NH3+])C)[C@@H]([C@H]([C@H]1O)O)O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0341:
    id: AA0341
    name: 2-(S-L-cysteinyl)-D-phenylalanine
    comments: The D-stereoisomer of the 2-S-cysteinyl substituted phenylalanine has
      S configuration.
    synonyms:
    - (2S,5R)-2,5-diamino-3-thia-2-phenylmethylhexanedioic acid
    - (2S)-2-amino-2-[(2R)-2-amino-2-carboxyethyl]sulfanyl-3-phenylpropanoic acid
    - alpha-(L-cystein-S-yl)-D-phenylalanine
    identifiers:
    - ns: go
      id: GO:0046925
    - ns: resid
      id: AA0341
    - ns: mod
      id: MOD:00346
    structure: O=C[C@](Cc1ccccc1)(SC[C@@H](C(=O)O)[NH3+])N
    base_monomers:
    - F
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0442:
    id: AA0442
    name: (2S)-4-hydroxyleucine
    synonyms:
    - (2S)-2-amino-4-hydroxy-4-methylpentanoic acid
    - gamma-hydroxyleucine
    identifiers:
    - ns: mod
      id: MOD:01372
    - ns: resid
      id: AA0442
    structure: OC(=O)[C@H](CC(O)(C)C)[NH3+]
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0546:
    id: AA0546
    name: L-allo-isoleucine
    comments: 'Generating Enzyme: protein-isoleucine 3-epimerase (EC 5.1.1.-).'
    synonyms:
    - 2-azanyl-3-methylpentanoic acid
    - alpha-amino-beta-methylvaleric acid
    - allo-L-isoleucine
    - 3-methyl-norvaline
    - (2S,3R)-2-amino-3-methylpentanoic acid
    - L-threo-isoleucine
    identifiers:
    - ns: chebi
      id: CHEBI:30008
    - ns: cas
      id: 1509-34-8
    - ns: mod
      id: MOD:01840
    - ns: resid
      id: AA0546
    structure: CC[C@H]([C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0103:
    id: AA0103
    name: S-12-hydroxyfarnesyl-L-cysteine
    comments: Formation of S-12-hydroxyfarnesylcysteine may be coupled with subsequent
      cleavage of a carboxy-terminal tripeptide for the CAAX motif and methyl esterification
      of the farnesylated cysteine. See L-cysteine methyl ester (RESID:AA0105).
    synonyms:
    - (2R)-2-amino-3-([(2E,6E,10Z)-12-hydroxy-3,7,11-trimethyldodeca-2,6,10-trien-1-yl]sulfanyl)propanoic
      acid
    - 2-amino-3-(12-hydroxy-3,7,11-trimethyl-3,6,10-dodecatrienylthio)propanoic acid
    identifiers:
    - ns: mod
      id: MOD:00112
    - ns: go
      id: GO:0018227
    - ns: resid
      id: AA0103
    structure: OC/C(=C\CC/C(=C/CC/C(=C/CSC[C@@H](C(=O)O)[NH3+])/C)/C)/C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0087:
    id: AA0087
    name: L-glutamic acid 1-amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - 4,5-diamino-5-oxopentanoic acid
    - isoglutamine
    - 4-amido-4-carbamoyl-butyric acid
    - E
    - L-alpha-glutamine
    - (4S)-4,5-diamino-5-oxo-pentanoic acid
    - (2S)-2-amino-1-pentanediamic acid
    identifiers:
    - ns: resid
      id: AA0087
    - ns: go
      id: GO:0018040
    - ns: chebi
      id: CHEBI:21305
    - ns: cas
      id: 328-48-3
    - ns: mod
      id: MOD:00096
    - ns: pdb-ccd
      id: GMA
    - ns: pdb.ligand
      id: NH2
    structure: '[O-]C(=O)CC[C@@H](C(=O)N)[NH3+]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0432:
    id: AA0432
    name: S-(aspart-4-yloxy) thiocarbonate
    comments: This modification was originally observed in the enzyme expressed in
      Escherichia coli. It was not chemically confirmed or characterized. It did not
      appear in a later model at higher resolution by the same group.
    synonyms:
    - D
    - (2S)-2-amino-4-(carboxysulfanyl)oxy-4-oxobutanoic acid
    - o-(carboxysulfanyl)-4-oxo-l-homoserine
    - O-(carboxysulfanyl)-4-oxo-D-homoserine
    - (2R)-2-amino-4-carboxysulfanyloxy-4-oxo-butanoic acid
    - 4-aspartyloxysulfanylcarbonate
    - O-carboxysulfanyl-4-oxo-L-homoserine
    identifiers:
    - ns: pdb.ligand
      id: OHS
    - ns: resid
      id: AA0432
    - ns: pdb-ccd
      id: OHS
    - ns: mod
      id: MOD:01178
    structure: O=C(C[C@@H](C(=O)O)[NH3+])OSC(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0550:
    id: AA0550
    name: 2-(3-methylbutanoyl)-5-hydroxy-oxazole-4-carbothionic acid
    comments: The amino group of the following amino acid forms a thiopeptide bond.
      The amino(sulfanyl)methylidene tautomeric form is shown in the diagram and model.
      The biosynthesis of this modification from the encoded cysteine peptide has
      not been elaborated.
    synonyms:
    - (4Z)-4-[hydroxy(sulfanyl)methylidene]-2-(3-methylbutanoyl)-1,3-oxazol-5(4H)-one
      [tautomer]
    - 5-hydroxy-2-(3-methylbutanoyl)-1,3-oxazole-4-carbothioic O-acid
    identifiers:
    - ns: resid
      id: AA0550
    - ns: mod
      id: MOD:01844
    - ns: pdb.ligand
      id: 8LI
    structure: '[S-]/C=C/1\N=C(OC1=O)C(=O)CC(C)C'
    base_monomers:
    - L
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
  AA0444:
    id: AA0444
    name: (2S,4R)-5-oxoleucine
    comments: The oxidation artifacts 5-hydroxyleucine and 5-oxoleucine can form autocatalytically
      and stereospecifically, but not selectively. It is not clear whether the modified
      residue subsequently takes part in catalytic reactions at the active site of
      alpha-ketoglutarate-dependent dioxygenase alkB homolog 3 (ABH3).
    synonyms:
    - (4R)-5-oxo-L-leucine
    - (2S,4R)-2-amino-4-methyl-5-oxo-pentanoic acid
    - (4r)-5-oxo-l-leucine
    - L
    - (2S,4R)-2-amino-4-methyl-5-oxopentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LED
    - ns: mod
      id: MOD:01374
    - ns: resid
      id: AA0444
    - ns: chebi
      id: CHEBI:43739
    - ns: pdb.ligand
      id: LED
    structure: O=C[C@@H](C[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0614:
    id: AA0614
    name: 5-glutamyl coenzyme A thioester
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - 5-glutamyl 4-[(3'-phospho-adenosyl-5'-diphosphoryl)oxy]pantetheine thioester
    - (2S)-2-amino-5-([2-(3-[(2R)-2-hydroxy-3,3-dimethyl-4-([3'-phospho-adenosyl-5'-diphosphoryl]-oxy)-butanamido]-propanamido)-ethyl]-sulfanyl)-5-oxopentanoic
      acid
    - (2S)-2-amino-5-(2-[([3-([(2R)-2-hydroxy-3,3-dimethyl-4-([3'-phospho-adenosyl-5'-diphosphoryl]-oxy)-butanoyl]-amino)-propanoyl]-amino)-ethyl]-sulfanyl)-5-oxopentanoic
      acid
    identifiers:
    - ns: mod
      id: MOD:01972
    - ns: resid
      id: AA0614
    structure: O=C(NCCSC(=O)CC[C@@H](C(=O)O)[NH3+])CCNC(=O)[C@@H](C(COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1OP(=O)([O-])[O-])O)n1cnc2c1ncnc2N)[O-])[O-])(C)C)O
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0200:
    id: AA0200
    name: D-valine
    comments: 'Generating Enzyme: protein-valine epimerase (EC 5.1.1.-).'
    synonyms:
    - (R)-2-amino-3-methylbutanoic acid
    - alpha-aminoisovaleric acid
    - alpha-amino-beta-methylbutyric acid
    identifiers:
    - ns: resid
      id: AA0200
    - ns: cas
      id: 640-68-6
    - ns: pdb.ligand
      id: DVA
    - ns: mod
      id: MOD:00705
    - ns: chebi
      id: CHEBI:30016
    structure: '[NH3+][C@@H](C(=O)O)C(C)C'
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0056:
    id: AA0056
    name: S-acetyl-L-cysteine
    synonyms:
    - (2R)-2-amino-3-ethanoylsulfanyl-propanoic acid
    - cysteine acetate thioester
    - C
    - S-acetyl-L-cysteine
    - (2R)-3-acetylsulfanyl-2-aminopropanoic acid
    - s-acetyl-cysteine
    - S-acetylcysteine
    - 2-azanyl-3-(acetylsulfanyl)propanoic acid
    - 2-amino-3-(acetylthio)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018219
    - ns: cas
      id: 15312-11-5
    - ns: pdb.ligand
      id: SCY
    - ns: mod
      id: MOD:00065
    - ns: pdb-ccd
      id: SCY
    - ns: resid
      id: AA0056
    structure: CC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0435:
    id: AA0435
    name: L-aspartic acid 4-methyl ester
    comments: An enzyme acting to form the methyl ester of L-aspartyl peptides might
      interfere with the D-aspartyl peptide repair mechanism.
    synonyms:
    - 4-methyl L-aspartate
    - 2-aminobutanedioic acid 4-methyl ester
    - 4-methyl L-2-aminosuccinic acid
    - (2S)-2-amino-4-methoxy-4-oxobutanoic acid
    - 4-methyl L-hydrogen aspartate
    - aspartic acid beta-methyl ester
    - aspartic acid 4-methyl ester
    identifiers:
    - ns: mod
      id: MOD:01181
    - ns: cas
      id: 16856-13-6
    - ns: resid
      id: AA0435
    structure: COC(=O)C[C@H]([NH3+])C(=O)O
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0102:
    id: AA0102
    name: S-farnesyl-L-cysteine
    comments: 'Formation of S-farnesycysteine may be coupled with subsequent cleavage
      of a carboxy-terminal tripeptide for the CXXX motif and methyl esterification
      of the farnesylated cysteine. See L-cysteine methyl ester (RESID:AA0105). This
      modification may be found at the first position in the sequence motif CXX[SAQCMT]*
      where the second and third positions are usually aliphatic. Generating Enzyme:
      protein-cysteine farnesyltransferase (EC 2.5.1.-).'
    synonyms:
    - 2-amino-3-(3,7,11-trimethyl-2,6,10-dodecatrienylthio)propanoic acid
    - (2R)-2-amino-3-([(2E,6E)-3,7,11-trimethyldodeca-2,6,10-trien-1-yl]sulfanyl)propanoic
      acid
    identifiers:
    - ns: pdb.ligand
      id: FAR
    - ns: cas
      id: 68000-92-0
    - ns: go
      id: GO:0018226
    - ns: resid
      id: AA0102
    - ns: mod
      id: MOD:00111
    structure: C/C(=C\CSC[C@@H](C(=O)O)[NH3+])/CC/C=C(/CCC=C(C)C)\C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0032:
    id: AA0032
    name: L-gamma-carboxyglutamic acid
    comments: 'The gamma-carboxylation of glutamic acid residues is performed by a
      vitamin K-dependent enzyme. Generating Enzyme: gamma-glutamyl carboxylase (EC
      4.1.1.-).'
    synonyms:
    - 4-carboxyglutamic acid
    - gamma-carboxy-glutamic acid
    - (3S)-3-aminopropane-1,1,3-tricarboxylic acid
    - E
    - 3-azanylpropane-1,1,3-tricarboxylic acid
    - (3S)-3-azanylpropane-1,1,3-tricarboxylic acid
    - 3-amino-1,1,3-propanetricarboxylic acid
    - 1-carboxyglutamic acid [misnomer]
    identifiers:
    - ns: mod
      id: MOD:00041
    - ns: pdb.ligand
      id: CGU
    - ns: cas
      id: 53861-57-7
    - ns: go
      id: GO:0017187
    - ns: chebi
      id: CHEBI:61939
    - ns: pdb-ccd
      id: CGU
    - ns: resid
      id: AA0032
    structure: O=C[C@H](CC(C(=O)[O-])C(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0175:
    id: AA0175
    name: L-3'-bromophenylalanine
    synonyms:
    - meta-bromophenylalanine
    - m-bromophenylalanine
    - (S)-2-amino-3-(3-bromophenyl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0175
    - ns: mod
      id: MOD:00184
    - ns: cas
      id: 82311-69-1
    - ns: go
      id: GO:0018075
    structure: OC(=O)[C@H](Cc1cccc(c1)Br)[NH3+]
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0240:
    id: AA0240
    name: glycine oxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a serine hydroxyl with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-serine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-aminomethyl-1,3-oxazole-4-carboxylic acid
    - 2-azanylmethyl-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0240
    - ns: mod
      id: MOD:00245
    - ns: go
      id: GO:0018134
    structure: NCc1occ(n1)C(=O)O
    base_monomers:
    - S
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
  AA0263:
    id: AA0263
    name: L-3',4',5'-trihydroxyphenylalanine
    synonyms:
    - L-3,4,5-TOPA
    - (S)-2-amino-3-(3,4,5-trihydroxyphenyl)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018172
    - ns: mod
      id: MOD:00268
    - ns: resid
      id: AA0263
    structure: OC(=O)[C@H](Cc1cc(O)c(c(c1)O)O)[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0609:
    id: AA0609
    name: omega-N-(N-acetylamino)glucosyl-L-arginine
    comments: 'This modification is produced in host proteins by a secretion system
      effector of some enteropathogenic bacteria. The anomeric form of the product
      has not been characterized; the beta form is presented. Generating Enzyme: [protein]-L-arginine
      N-acetyl-D-glucosaminyl-transferase NleB (EC 2.4.1.-).'
    synonyms:
    - N(omega)-(2-acetamido-2-deoxy-D-glucopyranosyl)-L-arginine
    - N(omega)-(2-N-acetylaminoglucosyl)arginine
    - omega-N-(2-acetylamino-2-deoxy-D-glucopyranosyl)-L-arginine
    - (2S)-2-amino-5-[(amino[(2-N-acetylamino-2-deoxy-D-glucopyranosyl)amino]methylidene)amino]pentanoic
      acid
    - NG-(2-acetamido-2-deoxy-D-glucopyranosyl)-L-arginine
    - N(omega)-(2-acetylamino-2-deoxy-D-glucopyranosyl)-L-arginine
    - omega-N-(2-N-acetylaminoglucosyl)arginine
    - NG-(2-acetylamino-2-deoxy-D-glucopyranosyl)-L-arginine
    - omega-N-(2-acetamido-2-deoxy-D-glucopyranosyl)-L-arginine
    - NG-(2-N-acetylaminoglucosyl)arginine
    identifiers:
    - ns: mod
      id: MOD:01967
    - ns: resid
      id: AA0609
    structure: OC[C@H]1O[C@@H](N/C(=[NH+]\CCC[C@@H](C(=O)O)[NH3+])/N)[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0428:
    id: AA0428
    name: S-15,16-dihydrobiliverdin-L-cysteine
    comments: 15,16-dihydrobiliverdin transmits violet.
    synonyms:
    - 3'-cysteinyl-15,16-dihydrobiliverdin
    - 15,16-dihydrobiliverdin cysteine adduct
    - 3alpha-cysteinyl-15,16-dihydrobiliverdin
    - (16R)-18-ethenyl-8,12-bis(2-carboxyethyl)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-2,7,13,17-tetramethyl-15,16-dihydrobilin-1,19(21H,24H)-dione
    - DBV
    - 15,16-dihydrobiliverdin IXalpha
    - 18-ethenyl-8,12-bis(2-carboxyethyl)-3-(2-(cysteinyl-S)-ethyl)-2,7,13,17-tetramethylbiladiene-ab-1,19(16H,21H)-dione
    - 15,16-Dhbv
    identifiers:
    - ns: resid
      id: AA0428
    - ns: pdb.ligand
      id: DBV
    - ns: mod
      id: MOD:01142
    - ns: cas
      id: 137429-14-2
    structure: O=C[C@H](CS[C@H](C1=C(C)C(=O)N/C/1=C\c1[nH]c(c(c1C)CCC(=O)[O-])Cc1[nH]c(c(c1CCC(=O)[O-])C)C[C@H]1NC(=O)C(=C1C)C=C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0149:
    id: AA0149
    name: 4'-(L-tryptophan)-L-tryptophyl quinone
    comments: 'Generating Enzyme: methylamine dehydrogenase activase MauG (EC 6.-.-.-).'
    synonyms:
    - TTQ
    - 3-[(2S)-2-amino-2-carboxyethyl]-4-(3-[(2S)-2-amino-2-carboxyethyl]-1H-indol-2-yl)-6,7-indolinedione
    - 2-amino-3-[2-[2-amino-3-(2-carboxyethyl)-6,7-dioxo-1H-indol-4-yl]-1H-indol-3-yl]propanoic
      acid
    - 4'-tryptophan-tryptophylquinone
    - 4-(2'-tryptophyl)tryptophan-6,7-dione
    - alpha,alpha'-diamino-6',7'-dihydro-6',7'-dioxo-(2,4'-bi-1H-indole)-3,3'-dipropanoic
      acid
    identifiers:
    - ns: cas
      id: 134645-25-3
    - ns: resid
      id: AA0149
    - ns: mod
      id: MOD:00158
    - ns: chebi
      id: CHEBI:20251
    - ns: go
      id: GO:0018069
    structure: O=C[C@H](Cc1c[nH]c2c1C(=CC(=O)C2=O)c1[nH]c2c(c1C[C@@H](C(=O)O)[NH3+])cccc2)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
    - molecule: Monomer
      element: H
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  AA0545:
    id: AA0545
    name: N6-succinyl-L-lysine
    comments: The responsible generating enzyme activity is not identified. This modification
      can be reversed by Sirt5.
    synonyms:
    - 4-[[(5S)-5-amino-6-hydroxy-6-oxohexyl]amino]-4-oxobutanoate
    - N(epsilon)-(succinyl)lysine
    - 2-azanyl-6-[(3-carboxypropanoyl)azanyl]hexanoic acid
    - succinyllysine
    - (2S)-2-amino-6-[(3-carboxypropanoyl)amino]hexanoic acid
    identifiers:
    - ns: mod
      id: MOD:01819
    - ns: resid
      id: AA0545
    structure: O=C[C@H](CCCCNC(=O)CCC(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0578:
    id: AA0578
    name: (2S,5S)-5-hydroxylysine
    comments: 'This diastereomeric form has been found in some splicing regulatory
      proteins. For the (2S,5R)-diastereomer, see RESID:AA0028. The Enzyme Commission
      has not yet distinguished the different stereospecific enzyme activities. Generating
      Enzyme: peptide-lysine 5-dioxygenase JMJD6 (EC 1.14.11.-).'
    synonyms:
    - 2,6-diamino-2,3,4,6-tetradeoxyhexonic acid
    - alpha,epsilon-diamino-delta-hydroxycaproic acid
    - 2,6-bisazanyl-5-hydroxyhexanoic acid
    - L-threo-delta-hydroxylysine
    - (2S,5S)-2,6-diamino-5-hydroxyhexanoic acid
    - L-allo-delta-hydroxylysine
    identifiers:
    - ns: mod
      id: MOD:01918
    - ns: cas
      id: 18899-29-1
    - ns: resid
      id: AA0578
    structure: '[NH3+]C[C@H](CC[C@@H](C(=O)O)[NH3+])O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0167:
    id: AA0167
    name: O-(phosphoribosyl dephospho-coenzyme A)-L-serine
    comments: 'Generating Enzyme: holo-ACP synthase (EC 2.7.7.61).'
    synonyms:
    - O3-(phosphate-5-ribosyl-alpha-2-adenosine-5-diphosphate pantetheine)-L-serine
    - O3-2'-(5''-phosphoribosyl-3'-dephosphocoenzyme A)-L-serine
    - O3-(phosphoribosyl dephospho-coenzyme A)-L-serine
    identifiers:
    - ns: mod
      id: MOD:00176
    - ns: go
      id: GO:0018247
    - ns: resid
      id: AA0167
    structure: SCCNC(=O)CCNC(=O)[C@@H](C(COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(OC[C@@H](C(=O)O)[NH3+])[O-])n1cnc2c1ncnc2N)[O-])[O-])(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 54
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 57
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 56
    - molecule: Monomer
      element: H
      position: 56
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 57
    - molecule: Monomer
      element: H
      position: 57
      charge: 1
  S, S:
    id: AA0574
    name: L-serine oxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-serine
      cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-hydroxyethyl]-1,3-oxazole-4-carboxylic acid
    - 2-[(1S)-1-azanyl-2-hydroxyethyl]-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01903
    - ns: resid
      id: AA0574
    structure: OC[C@@H](c1occ(n1)C(=O)O)N
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0197:
    id: AA0197
    name: D-leucine
    comments: 'Generating Enzyme: protein-leucine epimerase (EC 5.1.1.-).'
    synonyms:
    - (2R)-2-amino-4-methylpentanoic acid
    - alpha-aminoisocaproic acid
    identifiers:
    - ns: mod
      id: MOD:00204
    - ns: cas
      id: 328-38-1
    - ns: go
      id: GO:0019129
    - ns: chebi
      id: CHEBI:30005
    - ns: resid
      id: AA0197
    - ns: pdb.ligand
      id: DLE
    structure: '[NH3+][C@@H](C(=O)O)CC(C)C'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0514:
    id: AA0514
    name: O-(6'-phosphomannosyl)-L-threonine
    comments: 'The alpha anomeric form is shown. See also RESID:AA0155, RESID:AA0247,
      RESID:AA0399, RESID:AA0401, RESID:AA0403, and RESID:AA0405 for other O-glycosylated
      threonines. Generating Enzyme: protein O-mannosyl transferase (EC 2.4.1.109);
      protein O-mannose beta-1,4-N-acetylglucosaminyltransferase (EC 2.4.1.-); protein
      O-(N-acetylglucosaminyl-beta-1,4)-mannose beta-1,4-N-acetylgalactosaminyltransferase
      (EC 2.4.1.-); protein O-mannose 6-phosphotransferase (EC 2.7.1.-).'
    synonyms:
    - (2S,3R)-2-amino-3-[6-phosphonooxy-alpha-D-mannopyranosyloxy]butanoic acid
    - O3-(6-phosphomannosyl)threonine
    identifiers:
    - ns: resid
      id: AA0514
    - ns: mod
      id: MOD:01617
    structure: '[NH3+][C@@H]([C@H](O[C@H]1O[C@H](COP(=O)([O-])[O-])[C@H]([C@H]([C@@H]1O)O)O)C)C(=O)O'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
    - molecule: Monomer
      element: H
      position: 33
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0194:
    id: AA0194
    name: D-phenylalanine
    comments: 'Generating Enzyme: protein-phenylalanine epimerase (EC 5.1.1.-).'
    synonyms:
    - (R)-2-amino-3-phenylpropanoic acid
    identifiers:
    - ns: pdb.ligand
      id: DPN
    - ns: cas
      id: 673-06-3
    - ns: mod
      id: MOD:00201
    - ns: chebi
      id: CHEBI:29996
    - ns: resid
      id: AA0194
    - ns: go
      id: GO:0019125
    structure: '[NH3+][C@@H](C(=O)O)Cc1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0533:
    id: AA0533
    name: N-methyl-L-serine
    comments: 'Polypeptides with monomethylated amino terminals can undergo premature
      cleavage during the coupling step of an Edman degradation. This can result in
      "preview" with both a residue and the following residue being seen from the
      first step on through a sequence. Generating Enzyme: N-terminal RCC1 methyltransferase
      (EC 2.1.1.-).'
    synonyms:
    - N-methylserine
    - (2S)-3-hydroxy-2-(methylamino)propanoic acid
    identifiers:
    - ns: cas
      id: 2480-26-4
    - ns: go
      id: GO:0035570
    - ns: resid
      id: AA0533
    - ns: mod
      id: MOD:01782
    structure: C[NH2+][C@H](C(=O)O)CO
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  AA0068:
    id: AA0068
    name: omega-N,omega-N-dimethyl-L-arginine
    comments: "This modification should not be confused with omega-N,omega-N'-dimethyl-L-arginine\
      \ (see RESID:AA0067) or N2,N2-dimethyl-L-arginine (see RESID:AA0569). Generating\
      \ Enzyme: histone-arginine N-methyltransferase (EC 2.1.1.125)."
    synonyms:
    - ng,ng-dimethyl-l-arginine
    - N5-[(dimethylamino)(imino)methyl]ornithine
    - asymmetric dimethylarginine
    - (2S)-2-azanyl-5-[(N,N-dimethylcarbamimidoyl)amino]pentanoic acid
    - NG,NG-dimethylarginine
    - N~5~-(N,N-dimethylcarbamimidoyl)-L-ornithine
    - R
    - (2S)-2-amino-5-([(dimethylamino)(imino)methyl]amino)pentanoic acid
    identifiers:
    - ns: mod
      id: MOD:00077
    - ns: pdb.ligand
      id: DA2
    - ns: cas
      id: 30315-93-6
    - ns: resid
      id: AA0068
    - ns: go
      id: GO:0018216
    - ns: chebi
      id: CHEBI:61896
    - ns: pdb-ccd
      id: DA2
    structure: OC(=O)[C@H](CCCNC(=[NH2])N(C)C)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0202:
    id: AA0202
    name: L-isoglutamyl-polyglutamic acid
    comments: This entry is for L-isoglutamyl-polyglutamic acid where there are 2
      to 6 alpha-peptide linked glutamic acid residues attached to a peptide glutamyl
      residue by an isopeptide bond. For a single glutamic acid attached to a peptide
      glutamyl residue by an isopeptide bond, see 5-glutamyl glutamic acid, RESID:AA0612.
    synonyms:
    - gamma-glutamylpolyglutamic acid
    identifiers:
    - ns: go
      id: GO:0018095
    - ns: mod
      id: MOD:00207
    - ns: resid
      id: AA0202
    structure: O=C[C@H](CCC(=O)N[C@H](C(=O)[O-])CCC(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0350:
    id: AA0350
    name: O3-(riboflavin phosphoryl)-L-serine
    comments: This modification is predicted for proteins homologous to Na(+)-translocating
      NADH:quinone oxidoreductase B and C chains in certain organisms where the position
      corresponding to O3-(ribofavin phosphoryl)-threonine instead encodes serine.
    synonyms:
    - O3-seryl flavin mononucleotide
    - (R)-2-amino-3-(riboflavin 5'-hydrogen phosphonoxy)propanoic acid
    - O3-seryl FMN
    identifiers:
    - ns: resid
      id: AA0350
    - ns: go
      id: GO:0050741
    - ns: mod
      id: MOD:00355
    structure: O=c1[nH]c(=O)c2c([nH]1)n(C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(OC[C@@H](C(=O)O)[NH3+])[O-])O)O)O)c1=C[C@H](C(=Cc1n2)C)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
    - molecule: Monomer
      element: H
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  AA0539:
    id: AA0539
    name: N-formyl-L-glutamic acid
    synonyms:
    - 2-formylaminopentanedioic acid
    - 2-formamidopentanedioic acid
    - (2S)-2-(formylamino)pentanedioic acid
    - 2-(formylazanyl)pentanedioic acid
    identifiers:
    - ns: mod
      id: MOD:01807
    - ns: resid
      id: AA0539
    structure: O=CN[C@@H](CCC(=O)[O-])C=O
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  AA0297:
    id: AA0297
    name: O-(phosphoglycosyl-D-mannose-1-phosphoryl)-L-serine
    comments: 'Mannose oligosaccharides and short phosphoglycan chains may be attached
      to the mannose 1-phosphate at the 2 position. See also RESID:AA0154, RESID:AA0208,
      RESID:AA0209, RESID:AA0210, RESID:AA0291, RESID:AA0296, RESID:AA0397, RESID:AA0398,
      RESID:AA0400, RESID:AA0402, RESID:AA0404, RESID:AA0406, and RESID:AA0422 for
      other O-glycosylated serines. Generating Enzyme: GDP-mannose:serine-protein
      mannose-1-phosphotransferase (EC 2.7.8.-).'
    synonyms:
    - O-(alpha-D-mannosyl-1-phosphoryl)-L-serine
    - O3-L-serine alpha-D-mannopyranose 1-phosphodiester
    - O-[alpha-D-mannopyranosyloxy(hydroxy)phosphoryl]-L-serine
    - O3-(D-mannose-1-phosphoryl)-L-serine
    identifiers:
    - ns: resid
      id: AA0297
    - ns: go
      id: GO:0018426
    - ns: mod
      id: MOD:00302
    structure: OC[C@H]1O[C@H](OP(=O)(OC[C@@H](C(=O)O)[NH3+])[O-])[C@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0215:
    id: AA0215
    name: 4-hydroxy-L-arginine
    comments: The stereochemistry for the second chiral center has not been resolved.
      The (2S,4R) diastereomer is shown.
    synonyms:
    - c-gamma-hydroxy arginine
    - gamma-hydroxyarginine
    - 2-amino-5-[(aminoiminomethyl)amino]-4-hydroxypentanoic acid [tautomer]
    - 2-amino-5-(carbamimidamido)-4-hydroxypentanoic acid [tautomer]
    - 2-amino-5-guanidino-4-hydroxypentanoic acid
    - amino{[(2R,4S)-4-amino-2,5-dihydroxy-5-oxopentyl]amino}methaniminium
    - (2S,4Xi)-2-amino-5-[(diaminomethylidene)amino]-4-hydroxypentanoic acid
    - C(gamma)-hydroxyarginine
    - '[amino-[[(2R,4S)-4-amino-2,5-dihydroxy-5-oxo-pentyl]amino]methylidene]azanium'
    - R
    identifiers:
    - ns: mod
      id: MOD:00220
    - ns: cas
      id: 2524-31-4
    - ns: pdb.ligand
      id: ARO
    - ns: pdb-ccd
      id: ARO
    - ns: resid
      id: AA0215
    - ns: go
      id: GO:0018102
    structure: O[C@H](C[C@@H](C(=O)O)[NH3+])C[NH+]=C(N)N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0287:
    id: AA0287
    name: N6-pyruvic acid 2-iminyl-L-lysine
    synonyms:
    - (2s)-2-amino-6-[(1-hydroxy-1-oxo-propan-2-ylidene)amino]hexanoic acid
    - (E)-N~6~-(1-carboxyethylidene)-L-lysine
    - (2S)-2-amino-6-([1-carboxyethylidene]amino)hexanoic acid
    - K
    - (2S)-2-azanyl-6-[(E)-(1-oxidanyl-1-oxidanylidene-propan-2-ylidene)amino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: KPI
    - ns: mod
      id: MOD:00292
    - ns: go
      id: GO:0018308
    - ns: resid
      id: AA0287
    - ns: pdb.ligand
      id: KPI
    structure: O=C[C@H](CCCC[NH2+][C@@H](C(=O)[O-])C)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0220:
    id: AA0220
    name: S-(6-FMN)-L-cysteine
    comments: 'The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - (R)-2-amino-3-[6-riboflavin 5'-dihydrogen phosphate]sulfanylpropanoic acid
    - 6-[S-cysteinyl]FMN
    - 6-[S-cysteinyl]flavin mononucleotide
    identifiers:
    - ns: resid
      id: AA0220
    - ns: mod
      id: MOD:00225
    - ns: go
      id: GO:0018310
    - ns: pdb.ligand
      id: FMN
    structure: O=C1NC(=O)[C@@H]2C(=N1)N(C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)c1c(N2)c(SC[C@@H](C(=O)O)[NH3+])c(c(c1)C)C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 35
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 38
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 37
    - molecule: Monomer
      element: H
      position: 37
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 38
    - molecule: Monomer
      element: H
      position: 38
      charge: 1
  AA0170:
    id: AA0170
    name: L-glutamyl 5-glycerylphosphorylethanolamine
    comments: 5-Glutamyl glycerylphosphorylethanolamine appears to occur uniquely
      in translation elongation factor eEF-1 alpha chains. It is known to be a modification
      of glutamic acid. The stereochemistry of the glycerol phosphate has not been
      determined. The sn-3 form is shown. It has been established that is possible
      for the glycerol group to be secondarily modified by conjugation with long chain
      fatty acids, but probably not with inositol-containing lipids or glycolipids.
      The predominant soluble form is not lipidated, and the modified protein does
      not appear to be membrane associated.
    synonyms:
    - L-glutamyl 5-glycerylphosphorylethanolamine
    - L-glutamyl 5-glycerophosphorylethanolamine
    - (S)-2-amino-5-[2-([([2,3-dihydroxypropyl]oxy)(hydroxy)phosphoryl]oxy)ethyl]amino-5-oxopentanoic
      acid
    - L-glutamyl 5-glycerophosphoethanolamine
    identifiers:
    - ns: go
      id: GO:0018072
    - ns: cas
      id: 1190-00-7
    - ns: mod
      id: MOD:00179
    - ns: resid
      id: AA0170
    structure: OC[C@H](COP(=O)(OCCNC(=O)CC[C@@H](C(=O)O)[NH3+])[O-])O
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  AA0021:
    id: AA0021
    name: N-formyl-L-methionine
    comments: "N-formylmethionine is translated for the initiator codon in bacteria,\
      \ and there are different tRNA's with specific tRNA synthases for the initiator\
      \ N-formylmethionine and the elongation methionine forms. In eukaryotic organelles\
      \ there is only one tRNA for methionine. A portion of the Met-tRNA is N-formylated\
      \ by mitochondrion specific methionyl-tRNA formyltransferase and recruited by\
      \ mitochondrial translation initiation factor 2. As an aldehyde, the formyl\
      \ group readily undergoes hydration. For the hydrated form N-(dihydroxymethyl)-L-methionine\
      \ of this residue, see RESID:AA0493. Although appropriate, the keyword \"thioether\
      \ bond\" normally does not appear for this amino acid. Generating Enzyme: methionine--tRNA\
      \ ligase (EC 6.1.1.10); methionyl-tRNA formyltransferase (EC 2.1.2.9)."
    synonyms:
    - (2S)-2-formamido-4-methylsulfanyl-butanoic acid
    - 2-formylamino-4-(methylthio)butanoic acid
    - (2S)-2-formylamino-4-(methylsulfanyl)butanoic acid
    - 2-formamido-4-(methylsulfanyl)butanoic acid
    - M
    - n-formylmethionine
    - N-formyl-L-methionine
    - 2-formylazanyl-4-(methylsulfanyl)butanoic acid
    identifiers:
    - ns: mod
      id: MOD:00482
    - ns: mod
      id: MOD:00030
    - ns: pdb.ligand
      id: FME
    - ns: resid
      id: AA0021
    - ns: pdb-ccd
      id: FME
    - ns: chebi
      id: CHEBI:49298
    - ns: cas
      id: 4289-98-9
    structure: CSCC[C@@H](C(=O)O)NC=O
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0462:
    id: AA0462
    name: 3-hydroxy-L-phenylalanine
    synonyms:
    - beta-hydroxyphenylalanine
    - beta-phenylserine
    - 3-phenyl-L-serine
    - 3-hydoxyphenylalanine
    - (2S,3S)-2-amino-3-hydroxy-3-phenylpropanoic acid
    - L-threo-3-phenylserine
    identifiers:
    - ns: chebi
      id: CHEBI:16795
    - ns: cas
      id: 1078-17-7
    - ns: resid
      id: AA0462
    - ns: mod
      id: MOD:01385
    structure: O[C@H]([C@@H](C(=O)O)N)c1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0034:
    id: AA0034
    name: S-phospho-L-cysteine
    synonyms:
    - (2R)-2-amino-3-phosphonosulfanyl-propanoic acid
    - S-phosphonocysteine
    - S3-phosphocysteine
    - C
    - s-phosphocysteine
    - 2-azanyl-3-(phosphonosulfanyl)propanoic acid
    - S-phosphono-L-cysteine
    - cysteine phosphate thioester
    - (2R)-2-amino-3-(phosphonosulfanyl)propanoic acid
    identifiers:
    - ns: go
      id: GO:0018218
    - ns: pdb.ligand
      id: CSP
    - ns: resid
      id: AA0034
    - ns: chebi
      id: CHEBI:61956
    - ns: pdb-ccd
      id: CSP
    - ns: cas
      id: 115562-30-6
    - ns: mod
      id: MOD:00043
    structure: OC(=O)[C@H](CSP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0054:
    id: AA0054
    name: N-acetyl-L-valine
    synonyms:
    - (2S)-2-acetamido-3-methylbutanoic acid
    - 2-acetylazanyl-3-methylbutanoic acid
    - N-acetylvaline
    - 2-acetylamino-3-methylbutanoic acid
    identifiers:
    - ns: mod
      id: MOD:00063
    - ns: chebi
      id: CHEBI:21565
    - ns: resid
      id: AA0054
    - ns: cas
      id: 96-81-1
    - ns: go
      id: GO:0018001
    structure: OC[C@H](C(C)C)NC(=O)C
    base_monomers:
    - V
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0195:
    id: AA0195
    name: D-serine
    comments: 'Generating Enzyme: protein-serine epimerase (EC 5.1.1.16).'
    synonyms:
    - (R)-2-amino-3-hydroxypropanoic acid
    identifiers:
    - ns: pdb.ligand
      id: DSN
    - ns: go
      id: GO:0019126
    - ns: chebi
      id: CHEBI:29998
    - ns: mod
      id: MOD:00891
    - ns: resid
      id: AA0195
    - ns: cas
      id: 312-84-5
    - ns: mod
      id: MOD:00202
    structure: OC[C@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0336:
    id: AA0336
    name: N-methyl-L-isoleucine
    comments: 'This modification is predicted for proteins homologous to pilin in
      certain organisms where the position corresponding to N-methylphenylalanine
      instead encodes isoleucine. Polypeptides with monomethylated amino terminals
      can undergo premature cleavage during the coupling step of an Edman degradation.
      This can result in "preview" with both a residue and the following residue being
      seen from the first step on through a sequence. Generating Enzyme: prepilin
      peptidase (EC 3.4.23.43).'
    synonyms:
    - (2S,3S)-2-methylamino-3-methylpentanoic acid
    - N-methylisoleucine
    - n-methyl-isoleucine
    - I
    - N-methyl-L-isoleucine
    - (2S,3S)-3-methyl-2-methylamino-pentanoic acid
    identifiers:
    - ns: cas
      id: 4125-98-8
    - ns: resid
      id: AA0336
    - ns: pdb.ligand
      id: IML
    - ns: mod
      id: MOD:00341
    - ns: go
      id: GO:0046895
    - ns: pdb-ccd
      id: IML
    structure: CC[C@@H]([C@@H](C(=O)O)[NH2+]C)C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0361:
    id: AA0361
    name: O-sulfo-L-serine
    synonyms:
    - O-sulfo-L-serine
    - 2-amino-3-hydroxypropanoic acid 3-sulfate
    - (2S)-2-amino-3-(sulfooxy)propanoic acid
    - (2S)-2-amino-3-sulfooxy-propanoic acid
    - serine sulfate ester
    - S
    - O3-sulfonoserine
    - o-sulfo-l-serine
    - O3-sulfoserine
    identifiers:
    - ns: pdb-ccd
      id: OSE
    - ns: mod
      id: MOD:00366
    - ns: pdb.ligand
      id: OSE
    - ns: resid
      id: AA0361
    - ns: cas
      id: 626-69-7
    - ns: go
      id: GO:0050984
    structure: OC(=O)[C@H](COS(=O)(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0095:
    id: AA0095
    name: L-proline amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - L-prolinamide
    - (2S)-pyrrolidine-2-carboxamide
    - l-prolinamide
    - P
    - prolinamide
    identifiers:
    - ns: resid
      id: AA0095
    - ns: chebi
      id: CHEBI:21374
    - ns: go
      id: GO:0018048
    - ns: mod
      id: MOD:00104
    - ns: pdb-ccd
      id: LPD
    - ns: pdb.ligand
      id: NH2
    - ns: cas
      id: 7531-52-4
    structure: NC(=O)[C@@H]1CCC[NH2+]1
    base_monomers:
    - P
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0477:
    id: AA0477
    name: L-lysyl-poly(ADP-ribose)
    comments: 'The alpha form is presented. The keyword "phosphoprotein" is not used
      with ADP-ribosylation. Generating Enzyme: NAD+ ADP-ribosyltransferase (EC 2.4.2.30).'
    synonyms:
    - poly[2'-adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with 1alpha-D-ribofuranosyl]
      (2S)-2,6-diaminohexanoate
    identifiers:
    - ns: cas
      id: 26656-46-2
    - ns: resid
      id: AA0477
    - ns: mod
      id: MOD:01400
    structure: '[NH3+]CCCC[C@@H](C(=O)O[C@H]1O[C@@H]([C@H]([C@H]1O)O)CO[P@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-])[O-])[NH3+]'
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0342:
    id: AA0342
    name: 2-(S-L-cysteinyl)-D-allo-threonine
    comments: The D-stereoisomer of the 2-S-cysteinyl substituted threonine has S
      configuration. The second chiral center of the threonine is not inverted from
      the L-threo diastereomer (J.C. Vederas, private communication, 2003), and is
      thus D-allo.
    synonyms:
    - (2R,5S,6R)-2,5-diamino-5-carboxy-6-hydroxy-4-thiaheptanoic acid
    - (2S,3R)-2-amino-2-[(2R)-2-amino-2-carboxyethyl]sulfanyl-3-hydroxybutanoic acid
    - alpha-(L-cystein-S-yl)-D-allo-threonine
    identifiers:
    - ns: mod
      id: MOD:00347
    - ns: go
      id: GO:0046926
    - ns: resid
      id: AA0342
    structure: O=C[C@H](CS[C@](C(=O)O)([C@H](O)C)N)[NH3+]
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  AA0026:
    id: AA0026
    name: (2S,3R)-3-hydroxyasparagine
    comments: 'This diastereomeric form has been found in the EGF domain of many proteins.
      For the (2S,3S)-diastereomer, see RESID:AA0478. The PDB group code includes
      models with both the (2S,3R) and the (2S,3S) stereoconfiguration. The Enzyme
      Commission has not yet distinguished the different stereospecific enzyme activities.
      Generating Enzyme: peptide-aspartate beta-dioxygenase (EC 1.14.11.16).'
    synonyms:
    - (3S)-3-hydroxy-L-asparagine
    - (2S,3S)-2,4-diamino-3-hydroxy-4-oxo-butanoic acid
    - (2S,3R)-2,4-diamino-3-hydroxy-4-oxobutanoic acid
    - N
    - 2-azanyl-3-hydroxy-4-butanediamic acid
    - (2S,3R)-2-amino-3-hydroxy-4-butanediamic acid
    - beta-hydroxyasparagine
    - L-erythro-beta-hydroxyasparagine
    identifiers:
    - ns: resid
      id: AA0026
    - ns: cas
      id: 20790-74-3
    - ns: go
      id: GO:0018376
    - ns: mod
      id: MOD:00035
    - ns: pdb-ccd
      id: AHB
    - ns: pdb.ligand
      id: AHB
    structure: OC(=O)[C@H]([C@H](C(=O)N)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0535:
    id: AA0535
    name: N,N,N-trimethyl-L-serine
    comments: 'Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12 concerning
      calculation of the difference formula. Generating Enzyme: N-terminal RCC1 methyltransferase
      (EC 2.1.1.-).'
    synonyms:
    - (2S)-2-trimethylammonio-3-hydroxypropanoic acid
    - (1S)-1-carboxy-2-hydroxy-N,N,N-trimethylethanazanium
    - N,N,N-trimethylserinium
    - N,N,N-trimethylserine cation
    - (1S)-1-carboxy-2-hydroxy-N,N,N-trimethylethanaminium
    identifiers:
    - ns: go
      id: GO:0035570
    - ns: mod
      id: MOD:01784
    - ns: resid
      id: AA0535
    structure: OC[C@H]([N](C)(C)C)C(=O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
  AA0498:
    id: AA0498
    name: O-cholinephosphoryl-L-serine
    comments: In Neisseria this is produced as a secondary modification by methylation
      of O-(2-aminoethylphosphoryl)-L-serine. See RESID:AA0497.
    synonyms:
    - serine choline phosphodiester
    - serine choline phosphate
    - 2-[([(2S)-2-amino-2-carboxyethoxy][hydroxy]phosphoryl)oxy]-N,N,N-trimethylethanaminium
    - O3-phosphocholine-L-serine
    - O3-[(2-[trimethylammonio]ethyl)phosphoryl]-L-serine
    - 2-[([(2S)-2-azanyl-2-carboxyethoxy][hydroxy]phosphoryl)oxy]-N,N,N-trimethylethanazanium
    identifiers:
    - ns: mod
      id: MOD:01588
    - ns: resid
      id: AA0498
    structure: N[C@H](C(=O)O)CO[P@@](=O)(OCC[N](C)(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0053:
    id: AA0053
    name: N-acetyl-L-tyrosine
    synonyms:
    - 2-acetylamino-3-(4-hydoxyphenyl)propanoic acid
    - 2-acetylazanyl-3-(4-hydoxyphenyl)propanoic acid
    - N-acetyltyrosine
    - N-acetyl-L-tyrosine
    - (2S)-2-acetamido-3-(4-hydoxyphenyl)propanoic acid
    - Y
    - n-acetyl-l-tyrosine
    - (2S)-2-acetamido-3-(4-hydroxyphenyl)propanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:21563
    - ns: mod
      id: MOD:00062
    - ns: pdb-ccd
      id: 3NF
    - ns: resid
      id: AA0053
    - ns: go
      id: GO:0018000
    - ns: cas
      id: 537-55-3
    structure: OC(=O)[C@H](Cc1ccc(cc1)O)NC(=O)C
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  AA0122:
    id: AA0122
    name: L-2-aminoadipic acid
    comments: 'The oxidation of allysine to 2-aminoadipic acid is not well characterized.
      Generating Enzyme: protein-lysine 6-oxidase (EC 1.4.3.13).'
    synonyms:
    - (2S)-2-aminohexanedioic acid
    - 2-aminohexanedioic acid
    - L-alpha-aminoadipic acid
    - 2-amino-1,4-butanedicarboxylic acid
    - X
    identifiers:
    - ns: resid
      id: AA0122
    - ns: cas
      id: 1118-90-7
    - ns: mod
      id: MOD:00131
    - ns: pdb-ccd
      id: UN1
    - ns: go
      id: GO:0019728
    structure: O=C[C@H](CCCC(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0359:
    id: AA0359
    name: 5-hydroxy-N6,N6,N6-trimethyl-L-lysine
    comments: Hydroxylation at C-5 is assumed. Neither the position of the hydroxylation
      nor the stereochemistry for the second chiral center it produces have been determined.
      The (2S,5R) diastereomer is shown. Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12
      concerning calculation of the difference formula.
    synonyms:
    - (2Xi,5S)-5-azanyl-5-carboxy-2-hydroxy-N,N,N-trimethylpentanazanium
    - alpha-amino-epsilon-dimethylamino-delta-hydroxycaproic acid
    - delta-hydroxy-epsilon-N,N,N-trimethyllysine
    - 5-hydroxy-N(zeta)-trimethyllysine
    - (2R,5Xi)-5-amino-5-carboxy-2-hydroxy-N,N,N-trimethylpentan-1-aminium
    - 5-hydroxy-N6,N6,N6-trimethyllysine cation
    - lysine derivative Lys(z)
    - (2Xi,5S)-5-amino-5-carboxy-2-hydroxy-N,N,N-trimethylpentanaminium
    - 5-hydroxy-N6,N6,N6-trimethyllysin-N6-ium
    identifiers:
    - ns: mod
      id: MOD:00364
    - ns: resid
      id: AA0359
    - ns: go
      id: GO:0050838
    structure: O[C@@H](C[N](C)(C)C)CC[C@@H](C(=O)O)N
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
  AA0035:
    id: AA0035
    name: 1'-phospho-L-histidine
    comments: 'In the older biochemical literature this is usually called histidine-3-phosphate.
      See also RESID:AA0036. The crystallographic designation for the substituted
      nitrogen is epsilon-2, E2. Generating Enzyme: protein-histidine tele-kinase
      (EC 2.7.3.12).'
    synonyms:
    - tele-phosphohistidine
    - N1-phosphonohistidine
    - n1-phosphonohistidine
    - histidine-N(epsilon)-phosphate
    - H
    - (2S)-2-amino-3-(1-phosphono-1H-imidazol-4-yl)propanoic acid
    - NE2-phosphonohistidine
    - histidine-N1'-phosphate
    - (2S)-2-amino-3-(1-phosphonoimidazol-4-yl)propanoic acid
    - 1-phosphono-L-histidine
    - N(tau)-phosphohistidine
    - histidine-3-phosphate [misnomer]
    - 2-azanyl-3-(1-phosphono-1H-imidazol-4-yl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0035
    - ns: pdb-ccd
      id: NEP
    - ns: go
      id: GO:0018106
    - ns: cas
      id: 5789-14-0
    - ns: pdb.ligand
      id: NEP
    - ns: mod
      id: MOD:00044
    structure: OC(=O)[C@@H](Cc1ncn(c1)P(=O)([O-])[O-])[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0540:
    id: AA0540
    name: L-cysteine 3-hydroxypyridine-2,5-dicarboxylic acid
    comments: Formed by the metathesis of two didehydroalanines made from serines,
      condensation with a cysteine carbonyl and dehydrogenation. This modification
      is currently represented in the PDB as part of the HET group for the entire
      molecule of nosiheptide.
    synonyms:
    - 6-[(1R)-1-amino-2-sulfanylethyl]-3-hydroxypyridine-2,5-dicarboxylic acid
    - 6-[1-azanyl-2-sulfanylethyl]-3-hydroxypyridine-2,5-dicarboxylic acid
    identifiers:
    - ns: pdb.ligand
      id: MH6
    - ns: resid
      id: AA0540
    - ns: mod
      id: MOD:01814
    structure: SC[C@H](c1nc(C(=O)O)c(cc1C=O)[O-])[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
  AA0510:
    id: AA0510
    name: 3',5'-diiodo-L-tyrosine
    synonyms:
    - 3,5-diiodotyrosine
    - 3,5-diiodo-L-tyrosine
    - iodogorgoic acid
    - (2S)-2-amino-3-(4-hydroxy-3,5-diiodophenyl)propanoic acid
    - Y
    - DIT
    - (2S)-2-amino-3-(4-hydroxy-3,5-diiodo-phenyl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0510
    - ns: pdb.ligand
      id: TYI
    - ns: mod
      id: MOD:01613
    - ns: cas
      id: 300-39-0
    - ns: pdb-ccd
      id: TYI
    - ns: chebi
      id: CHEBI:15768
    structure: '[NH3+][C@H](C(=O)O)Cc1cc(I)c(c(c1)I)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0097:
    id: AA0097
    name: L-threonine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2s,3r)-2-amino-3-hydroxy-butanamide
    - (2S,3R)-2-amino-3-hydroxybutanamide
    - (2S,3R)-2-amino-3-hydroxy-butanamide
    - threoninamide
    identifiers:
    - ns: go
      id: GO:0018050
    - ns: resid
      id: AA0097
    - ns: mod
      id: MOD:00106
    - ns: pdb-ccd
      id: 9AT
    - ns: cas
      id: 2280-40-2
    - ns: chebi
      id: CHEBI:21404
    - ns: pdb.ligand
      id: NH2
    structure: C[C@H]([C@H]([NH3+])C(=O)N)O
    base_monomers:
    - T
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0055:
    id: AA0055
    name: N6-acetyl-L-lysine
    comments: 'Generating Enzyme: histone acetyltransferase (EC 2.3.1.48); tubulin
      N-acetyltransferase (EC 2.3.1.108); protein lysine N6-acetyltransferase (EC
      2.3.1.-).'
    synonyms:
    - N~6~-acetyl-L-lysine
    - n(6)-acetyllysine
    - (2S)-6-acetamido-2-aminohexanoic acid
    - 6-acetylazanyl-2-aminohexanoic acid
    - N(zeta)-acetyllysine
    - K
    - 6-acetylamino-2-aminohexanoic acid
    - epsilon-acetyllysine
    - (2S)-6-acetamido-2-amino-hexanoic acid
    identifiers:
    - ns: chebi
      id: CHEBI:61930
    - ns: pdb-ccd
      id: ALY
    - ns: mod
      id: MOD:00064
    - ns: resid
      id: AA0055
    - ns: pdb.ligand
      id: ALY
    - ns: go
      id: GO:0018003
    - ns: cas
      id: 692-04-6
    structure: CC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0052:
    id: AA0052
    name: N-acetyl-L-threonine
    synonyms:
    - 2-acetylamino-3-hydroxybutanoic acid
    - n-methylcarbonylthreonine
    - (2S,3R)-2-acetamido-3-hydroxy-butanoic acid
    - T
    - N-methylcarbonylthreonine
    - 2-acetylazanyl-3-hydroxybutanoic acid
    - N-acetyl-L-threonine
    - (2S,3R)-2-acetamido-3-hydroxybutanoic acid
    - N-acetylthreonine
    identifiers:
    - ns: resid
      id: AA0052
    - ns: cas
      id: 17093-74-2
    - ns: go
      id: GO:0017199
    - ns: mod
      id: MOD:00061
    - ns: pdb-ccd
      id: THC
    - ns: chebi
      id: CHEBI:45826
    structure: CC(=O)N[C@H](C(=O)O)[C@H](O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0093:
    id: AA0093
    name: L-methionine amide
    comments: 'Although appropriate, the keyword "thioether bond" normally does not
      appear for this amino acid. Generating Enzyme: peptidylglycine monooxygenase
      (EC 1.14.17.3).'
    synonyms:
    - 2-amino-4-(methylthio)butanamide
    - methioninamide
    - (2S)-2-amino-4-(methylsulfanyl)butanamide
    identifiers:
    - ns: cas
      id: 4510-08-1
    - ns: chebi
      id: CHEBI:21362
    - ns: mod
      id: MOD:00102
    - ns: go
      id: GO:0018046
    - ns: resid
      id: AA0093
    - ns: pdb.ligand
      id: NH2
    structure: CSCC[C@H]([NH3+])C(=O)N
    base_monomers:
    - M
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  AA0499:
    id: AA0499
    name: O-2,4-diacetamido-2,4-dideoxyglucosyl-L-serine
    comments: It is not clear whether or not there is a chemical difference in the
      glycosylation of the two varieties of strain MS11 used in these experiments.
      For O-(2,4-diacetamido-2,4,6-trideoxy-D-glucosyl)-L-serine, see RESID:AA0607.
    synonyms:
    - O-(2,4-diacetamido-2,4-dideoxy-beta-D-glucopyranosyl)-L-serine
    - (2S)-2-amino-3-[(2,4-diacetamido-2,4-dideoxy-beta-D-glucopyranosyl)oxy]propanoic
      acid
    - O3-(2,4-diacetamido-2,4-dideoxy-beta-D-glucopyranosyl)-L-serine
    - O-seryl-beta-2,4-bis(acetylamino)glucoside
    - O-[2,4-bis(acetylamino)]glucosyl-L-serine
    - DADDGlc
    identifiers:
    - ns: pdb.ligand
      id: DT6
    - ns: mod
      id: MOD:01589
    - ns: resid
      id: AA0499
    structure: OC[C@H]1O[C@@H](OC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1NC(=O)C)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0538:
    id: AA0538
    name: N,N-dimethyl-L-leucine
    synonyms:
    - (2S)-2-(dimethylamino)-4-methylpentanoic acid
    - 2-(dimethylazanyl)-4-methylpentanoic acid
    - N,N-dimethylleucine
    - 2-(dimethylamino)-4-methylvaleric acid
    identifiers:
    - ns: resid
      id: AA0538
    - ns: mod
      id: MOD:01806
    structure: CC(C[C@H]([NH+](C)C)C(=O)O)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0532:
    id: AA0532
    name: N6-butanoyl-L-lysine
    comments: A metabolic source for butanoic acid in the nucleus is not evident,
      and a responsible generating enzyme activity is not identified.
    synonyms:
    - N6-butyryllysine
    - (2S)-2-amino-6-(butanoylamino)hexanoic acid
    - epsilon-butyryl-L-lysine
    - N(zeta)-butanoyllysine
    - 2-amino-6-butyrylaminocaproic acid
    - (2S)-2-azanyl-6-(butanoylamino)hexanoic acid
    - n~6~-butanoyl-l-lysine
    - N~6~-butanoyl-L-lysine
    - N6-(1-oxobutyl)-L-lysine
    - epsilon-butanoyl-L-lysine
    identifiers:
    - ns: resid
      id: AA0532
    - ns: mod
      id: MOD:01781
    - ns: pdb.ligand
      id: BTK
    - ns: pdb-ccd
      id: BTK
    structure: CCCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0332:
    id: AA0332
    name: S-carbamoyl-L-cysteine
    comments: This modification can undergo dehydration to produce S-cyanocysteine.
      See RESID:AA0333. Carbamoylation of the sulfhydryl group can be artifactual,
      in particular when urea buffers are used.
    synonyms:
    - S-(aminocarbonyl)cysteine
    - S-cysteinyl carbamate ester
    - (2R)-3-aminocarbonylsulfanyl-2-azanyl-propanoic acid
    - beta-carbamylthioalanine
    - S-carbamylcysteine
    - S-carbamoyl-L-cysteine
    - 2-amino-3-(aminocarbonyl)thiopropanoic acid
    - S-carbamoylcysteine
    - s-carbamoyl-l-cysteine
    - C
    - 2-amino-3-(aminocarbonyl)sulfanylpropanoic acid
    - alpha-amino-beta-carbamylthiopropionic acid
    - (R)-2-amino-3-(carbamoylsulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: QCS
    - ns: resid
      id: AA0332
    - ns: go
      id: GO:0046891
    - ns: cas
      id: 2072-71-1
    - ns: mod
      id: MOD:00337
    structure: NC(=O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0543:
    id: AA0543
    name: 2'-oxo-L-tryptophan
    comments: This modification, which is not observed in other preparations of the
      same protein, is probably produced artifactually.
    synonyms:
    - W
    - 2-hydroxy-tryptophan
    - 2-oxotryptophan
    - 2-azanyl-3-[(3S)-2-oxo-2,3-dihydro-1H-indol-3-yl]propanoic acid
    - 2-hydroxy-L-tryptophan
    - (2S)-2-amino-3-(2-hydroxy-1H-indol-3-yl)propanoic acid
    - 2-oxo-L-tryptophan
    - (2S)-2-amino-3-[(3S)-2-oxo-2,3-dihydro-1H-indol-3-yl]propanoic acid
    identifiers:
    - ns: pdb.ligand
      id: TRO
    - ns: mod
      id: MOD:01817
    - ns: pdb-ccd
      id: TRO
    - ns: resid
      id: AA0543
    structure: OC(=O)[C@H](C[C@@H]1C(=O)Nc2c1cccc2)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0475:
    id: AA0475
    name: N6-propanoyl-L-lysine
    comments: 'A metabolic source for propanoic acid in the nucleus is not evident;
      the modification would be isobaric with lactaldehyde adduct, an advanced glycation
      end product of artifactual nucleic acid degradation This modification has been
      shown to be produced by Gcn-5-related N-acetyltransferases in some bacterial
      systems. In eukaryotes, a metabolic source for propanoic acid in the nucleus
      is not evident, and a responsible generating enzyme activity is not identified.
      Generating Enzyme: lysine N6-acyltransferase, acetoin utilization protein AcuA
      (EC 2.3.1.-).'
    synonyms:
    - N6-propionyllysine
    - (2S)-2-amino-6-(propanoylamino)hexanoic acid
    - N~6~-propanoyl-L-lysine
    - 2-amino-6-propionylaminocaproic acid
    - (2S)-2-azanyl-6-(propanoylamino)hexanoic acid
    - N6-(1-oxopropyl)-L-lysine
    - epsilon-propionyl-L-lysine
    - N(zeta)-propanoyllysine
    - n~6~-propanoyl-l-lysine
    - epsilon-propanoyl-L-lysine
    identifiers:
    - ns: resid
      id: AA0475
    - ns: pdb-ccd
      id: PRK
    - ns: pdb.ligand
      id: PRK
    - ns: cas
      id: 1974-17-0
    - ns: mod
      id: MOD:01398
    structure: CCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0352:
    id: AA0352
    name: 1'-(8alpha-FMN)-L-histidine
    comments: 'The arrangement of the attachment has not been completely established
      in some cases. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - 8alpha-(N(epsilon)-histidyl)FMN
    - 8alpha-(N1'-histidyl)FMN
    - (S)-2-amino-3-(1-[8alpha riboflavin 5'-dihydrogen phosphate]imidazol-4-yl)propanoic
      acid
    - N(tau)-(8alpha-FMN)-histidine
    - tele-(8alpha-FMN)-histidine
    identifiers:
    - ns: mod
      id: MOD:00357
    - ns: go
      id: GO:0050743
    - ns: resid
      id: AA0352
    structure: O=c1[nH]c(=O)c2c([nH]1)n(C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)c1=C[C@H](C(=Cc1n2)C)Cn1cnc(c1)C[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 46
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 49
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 48
    - molecule: Monomer
      element: H
      position: 48
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 49
    - molecule: Monomer
      element: H
      position: 49
      charge: 1
  AA0625:
    id: AA0625
    name: 2-(L-cystein-S-yl)-L-threonine
    synonyms:
    - (2R,3R)-2-amino-2-[(2R)-2-amino-2-carboxyethyl]sulfanyl-3-hydroxybutanoic acid
    - (2R,5R,6R)-2,5-diamino-5-carboxy-6-hydroxy-4-thiaheptanoic acid
    - alpha-(L-cystein-S-yl)-L-threonine
    identifiers:
    - ns: mod
      id: MOD:01988
    - ns: resid
      id: AA0625
    structure: O=C[C@H](CS[C@@](C(=O)O)([C@H](O)C)N)[NH3+]
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  AA0405:
    id: AA0405
    name: O-fucosyl-L-threonine
    comments: 'See also RESID:AA0155, RESID:AA0247, RESID:AA0399, RESID:AA0401, RESID:AA0403,
      and RESID:AA0515 for other O-glycosylated threonines. Generating Enzyme: peptide-O-fucosyltransferase
      (EC 2.4.1.221).'
    synonyms:
    - O3-fucosylthreonine
    - O-glycosylthreonine
    - (2S,3R)-2-amino-3-(6-deoxy-alpha-D-galactopyranosyloxy)butanoic acid
    identifiers:
    - ns: resid
      id: AA0405
    - ns: mod
      id: MOD:00813
    structure: OC(=O)[C@H]([C@H](O[C@H]1O[C@H](C)[C@@H]([C@@H]([C@H]1O)O)O)C)[NH3+]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  AA0397:
    id: AA0397
    name: O-glucosyl-L-serine
    comments: See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0402,
      RESID:AA0404, RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines.
    synonyms:
    - (2S)-2-amino-3-(beta-D-glucopyranosyloxy)propanoic acid
    - O3-glucosylserine
    - O-glycosylserine
    identifiers:
    - ns: mod
      id: MOD:00804
    - ns: resid
      id: AA0397
    structure: OC[C@H]1O[C@H](OC[C@@H](C(=O)O)[NH3+])[C@@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0121:
    id: AA0121
    name: L-allysine
    comments: 'Generating Enzyme: protein-lysine 6-oxidase (EC 1.4.3.13).'
    synonyms:
    - 2-aminoadipate 6-semialdehyde
    - AASA
    - alpha-amino-adipic acid delta-semialdahyde
    - (2S)-2-amino-6-oxohexanoic acid
    - 6-oxonorleucine
    - 2-amino-5-formylvaleric acid
    - 2-amino-adipic acid semialdahyde
    - 5-formyl-norvaline
    identifiers:
    - ns: resid
      id: AA0121
    - ns: cas
      id: 1962-83-0
    - ns: chebi
      id: CHEBI:17917
    - ns: mod
      id: MOD:00130
    - ns: go
      id: GO:0018057
    structure: O=CCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0467:
    id: AA0467
    name: L-valine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-2-methylpropyl]-1,3-thiazole-4-carboxylic acid
    - 2-[1-azanyl-2-methylpropyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01390
    - ns: pdb.ligand
      id: BB9
    - ns: resid
      id: AA0467
    structure: '[NH3+][C@H](c1scc(n1)C(=O)O)C(C)C'
    base_monomers:
    - V
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
  AA0061:
    id: AA0061
    name: N-methyl-L-alanine
    comments: 'Polypeptides with monomethylated amino terminals can undergo premature
      cleavage during the coupling step of an Edman degradation. This can result in
      "preview" with both a residue and the following residue being seen from the
      first step on through a sequence. Generating Enzyme: N-terminal RCC1 methyltransferase
      (EC 2.1.1.-).'
    synonyms:
    - n-methyl-l-alanine
    - (2S)-2-(methylamino)propanoic acid
    - (2S)-2-methylaminopropanoic acid
    - N-methyl-L-alanine
    - A
    - N-methylalanine
    - 2-methylazanylpropanoic acid
    identifiers:
    - ns: resid
      id: AA0061
    - ns: cas
      id: 3913-67-5
    - ns: mod
      id: MOD:00070
    - ns: pdb-ccd
      id: MAA
    - ns: chebi
      id: CHEBI:61922
    - ns: pdb.ligand
      id: MAA
    - ns: go
      id: GO:0018011
    structure: C[C@H]([NH2+]C)C(=O)O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  AA0548:
    id: AA0548
    name: S-(2-aminovinyl)-L-cysteine
    comments: 'This cross-link arises from the decarboxylation of the carboxyl-terminal
      portion of a lanthionine, either L-lanthionine (see RESID:AA0110) or meso-lanthionine
      (see RESID:AA0111). The stereochemistry of the (2-aminovinyl)-cysteine in cypemycin
      has not been determined. For the D stereoisomer, see RESID:AA0204. Generating
      Enzyme: peptidyl-cysteine dethiolase (EC 4.4.1.-); peptidyl-cysteine dehydroalanine/dehydrobutyrine
      ligase (EC 6.2.-.-).'
    synonyms:
    - (2R)-2-amino-3-([(Z)-2-aminoethenyl]sulfanyl)propanoic acid
    - (R,Z)-S-(2-aminovinyl)cysteine
    identifiers:
    - ns: resid
      id: AA0548
    - ns: mod
      id: MOD:01842
    structure: N/C=C\SC[C@@H]([NH3+])C(=O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0257:
    id: AA0257
    name: N-(L-glutamyl)-L-tyrosine
    comments: 'Generating Enzyme: tubulin--tyrosine ligase (EC 6.3.2.25).'
    synonyms:
    - (S,S)-2-(2-aminopentanedio-1-yl)amino-3-(4-hydoxyphenyl)propanoic acid
    - N-(L-glutamyl)-L-tyrosine
    identifiers:
    - ns: mod
      id: MOD:00262
    - ns: go
      id: GO:0018166
    - ns: chebi
      id: CHEBI:21477
    - ns: resid
      id: AA0257
    structure: '[O-]C(=O)CC[C@@H](C(=O)N[C@H](C(=O)[O-])Cc1ccc(cc1)O)[NH3+]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0173:
    id: AA0173
    name: L-bromohistidine
    comments: The position of the bromine substitution is uncertain. The 2'-bromohistidine
      is shown.
    identifiers:
    - ns: mod
      id: MOD:00182
    - ns: resid
      id: AA0173
    - ns: go
      id: GO:0018074
    structure: OC(=O)[C@@H]([NH3+])Cc1cnc([nH]1)Br
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0148:
    id: AA0148
    name: L-tryptophyl quinone
    synonyms:
    - 3-(6,7-dioxo-6,7-dihydro-1H-indol-3-yl)-L-alanine
    - 3-[(2S)-2-amino-2-carboxyethyl]-6,7-indolinedione
    - 2-amino-3-(6,7-dioxo-6,7-dihydro-1h-indol-3-yl)-propionic acid
    - 2-amino-3-(6,7-dioxo-6,7-dihydro-1H-indol-3-yl)-propionic acid
    - W
    - N-(3-carboxy-1-oxopropyl)-L-tryptophan
    - (2S)-2-amino-3-(6,7-dioxo-1H-indol-3-yl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0148
    - ns: mod
      id: MOD:00157
    - ns: pdb.ligand
      id: TRQ
    - ns: cas
      id: 73205-73-9
    - ns: go
      id: GO:0019926
    - ns: pdb-ccd
      id: TRQ
    structure: OC(=O)[C@H](Cc1c[nH]c2c1C=CC(=O)C2=O)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  AA0391:
    id: AA0391
    name: 2-(S-L-cysteinyl)pyruvic acid O-phosphothioketal
    comments: 'Generating Enzyme: 3-phosphoshikimate 1-carboxyvinyltransferase (EC
      2.5.1.19); UDP-N-acetylglucosamine 1-carboxyvinyltransferase (EC 2.5.1.7).'
    synonyms:
    - s-[(1s)-1-carboxy-1-(phosphonooxy)ethyl]-l-cysteine
    - (2S)-2-[(2R)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]sulfanyl-2-phosphonooxy-propanoic
      acid
    - cysteinyl pyruvate O-phosphothioketal
    - (2R)-2-amino-3-[1-carboxy-1-(phosphonooxy)ethyl]sulfanylpropanoic acid
    - phosphoenolpyruvate cysteine adduct
    - C
    - 2-([(2R)-2-azanyl-2-carboxyethyl]sulfanyl)-2-(phosphonooxy)propanoic acid
    - S-[1-carboxy-1-(phosphonooxy)ethyl]cysteine
    - S-[(1S)-1-carboxy-1-(phosphonooxy)ethyl]-L-cysteine
    - phospholactoyl cysteine adduct
    - 2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-2-(phosphonooxy)propanoic acid
    identifiers:
    - ns: mod
      id: MOD:00797
    - ns: resid
      id: AA0391
    - ns: pdb.ligand
      id: QPA
    - ns: pdb-ccd
      id: QPA
    structure: O=C[C@H](CS[C@@](C(=O)[O-])(OP(=O)([O-])[O-])C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0027:
    id: AA0027
    name: (2S,3R)-3-hydroxyaspartic acid
    comments: 'This diastereomeric form has been found in the EGF domain of many proteins.
      For the (2S,3S)-diastereomer, see RESID:AA0579. The Enzyme Commission has not
      yet distinguished the different stereospecific enzyme activities. Generating
      Enzyme: peptide-aspartate beta-dioxygenase (EC 1.14.11.16).'
    synonyms:
    - D
    - (3r)-3-hydroxy-l-aspartic acid
    - L-erythro-beta-hydroxyaspartic acid
    - 2-amino-3-hydroxysuccinic acid
    - (2S,3R)-2-amino-3-hydroxybutanedioic acid
    - (3R)-3-hydroxy-L-aspartic acid
    - 3-hydroxyaspartic acid
    - (2S,3R)-2-azanyl-3-hydroxy-butanedioic acid
    - 2-azanyl-3-hydroxybutanedioic acid
    identifiers:
    - ns: resid
      id: AA0027
    - ns: pdb.ligand
      id: BH2
    - ns: pdb-ccd
      id: BH2
    - ns: mod
      id: MOD:00036
    - ns: go
      id: GO:0019715
    structure: O=C[C@H]([C@H](C(=O)[O-])O)[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0459:
    id: AA0459
    name: 5'-(L-tyros-5'-yl)amino-L-tyrosine
    comments: This structure represents the cross-linked tyrosine portion of a four
      residue bis(lysine tyrosylquinone) structure which is itself part of a zinc
      binding complex with two histidine residues. This modification in the modeled
      protein has not been chemically confirmed.
    synonyms:
    - 5'-[(tyros-5'-yl)amino]tyrosine
    - 3-amino-l-tyrosine
    - 5'-tyrosyl-5'-aminotyrosine
    - bis(LTQ) linkage
    - (2S)-2-amino-3-(3-amino-4-hydroxy-phenyl)propanoic acid
    - (2S,2'S)-3,3'-[iminobis(4-hydroxybenzene-3,1-diyl)]bis(2-aminopropanoic acid)
    - Y
    - 3-amino-L-tyrosine
    identifiers:
    - ns: pdb.ligand
      id: TY2
    - ns: mod
      id: MOD:01787
    - ns: pdb-ccd
      id: TY2
    - ns: resid
      id: AA0459
    structure: OC[C@H](Cc1ccc(c(c1)Nc1cc(C[C@@H](CO)[NH3+])ccc1O)O)[NH3+]
    base_monomers:
    - Y
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  AA0456:
    id: AA0456
    name: N,N,N-trimethyl-L-methionine
    comments: 'Although appropriate, the keyword "thioether bond" normally does not
      appear for this amino acid. Consult FAQ at http://pir.georgetown.edu/resid/faq.shtml#q12
      concerning calculation of the difference formula. Generating Enzyme: ribosomal
      protein L11 methyltransferase (EC 2.1.1.-).'
    synonyms:
    - (1S)-1-carboxy-N,N,N-trimethyl-3-(methylsulfanyl)propanazanium
    - N,N,N-trimethylmethioninium
    - trimethyl-[(2S)-4-methylsulfanyl-1-oxidanyl-1-oxidanylidene-butan-2-yl]azanium
    - (1S)-1-carboxy-N,N,N-trimethyl-3-(methylsulfanyl)propan-1-aminium
    - 2-trimethylammonio-4-(methylthio)butanoic acid
    - n,n,n-trimethylmethionine
    - N,N,N-trimethylmethionine cation
    - (1S)-1-carboxy-N,N,N-trimethyl-3-(methylsulfanyl)propanaminium
    identifiers:
    - ns: go
      id: GO:0018014
    - ns: mod
      id: MOD:01382
    - ns: resid
      id: AA0456
    - ns: pdb.ligand
      id: 4MM
    - ns: pdb-ccd
      id: 4MM
    structure: CSCC[C@H]([N](C)(C)C)C(=O)O
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
  AA0192:
    id: AA0192
    name: D-allo-isoleucine
    comments: 'Generating Enzyme: protein-isoleucine 2-epimerase (EC 5.1.1.-).'
    synonyms:
    - 2-azanyl-3-methylpentanoic acid
    - alpha-amino-beta-methylvaleric acid
    - D-threo-isoleucine
    - 3-methyl-norvaline
    - (2R,3S)-2-amino-3-methylpentanoic acid
    - allo-D-isoleucine
    identifiers:
    - ns: pdb.ligand
      id: DIL
    - ns: go
      id: GO:0019124
    - ns: chebi
      id: CHEBI:30007
    - ns: cas
      id: 1509-35-9
    - ns: resid
      id: AA0192
    - ns: mod
      id: MOD:00199
    structure: CC[C@@H]([C@H](C(=O)O)[NH3+])C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0596:
    id: AA0596
    name: O-(L-isoglutamyl)-L-threonine
    comments: 'Generating Enzyme: protein-glutamine gamma-glutamyltransferase (EC
      2.3.2.13).'
    synonyms:
    - (gamma-glutamyl)histamine
    - (2S)-2-amino-5-([2-(1H-imidazol-5-yl)ethyl]amino)-5-oxopentanoic acid
    identifiers:
    - ns: resid
      id: AA0596
    - ns: mod
      id: MOD:01950
    structure: O=C(CC[C@@H](C(=O)O)[NH3+])NCCc1cnc[nH]1
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0207:
    id: AA0207
    name: S-4-hydroxycinnamyl-L-cysteine
    synonyms:
    - (2R)-2-amino-3-([(2E)-3-(4-hydroxyphenyl)prop-2-enoyl]sulfanyl)propanoic acid
    - cinnamate cysteine thioester
    - S-para-coumaryl-L-cysteine
    identifiers:
    - ns: resid
      id: AA0207
    - ns: mod
      id: MOD:00212
    - ns: go
      id: GO:0018097
    - ns: pdb.ligand
      id: HC4
    structure: O=C(/C=C/c1ccc(cc1)O)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
  AA0085:
    id: AA0085
    name: L-cysteine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - L-cysteinamide
    - 2-amino-3-mercapto-propionamide
    - cysteinamide
    - (2R)-2-amino-3-sulfanylpropanamide
    - C
    - (2R)-2-amino-3-sulfanyl-propanamide
    - 2-amino-3-mercaptopropanamide
    identifiers:
    - ns: mod
      id: MOD:00094
    - ns: cas
      id: 74401-72-2
    - ns: pdb-ccd
      id: CY3
    - ns: resid
      id: AA0085
    - ns: go
      id: GO:0018038
    - ns: pdb.ligand
      id: CY3
    - ns: chebi
      id: CHEBI:21262
    structure: NC(=O)[C@@H]([NH3+])CS
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0422:
    id: AA0422
    name: O-(N-acetylamino)fucosyl-L-serine
    comments: See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0402,
      RESID:AA0404, and RESID:AA0406 for other O-glycosylated serines.
    synonyms:
    - (2S)-2-amino-3-(2-acetamido-2-deoxy-beta-D-fucopyranosyloxy)propanoic acid
    - O3-(N-acetylfucosaminyl)serine
    - O-(N-acetylfucosaminyl)serine
    - O-(2-acetylamino-2-deoxy-beta-D-fucopyranosyl)-L-serine
    - O3-(2-acetamido-2-deoxy-beta-D-fucopyranosyl)-L-serine
    - O-seryl-beta-N-acetylfucosaminide
    identifiers:
    - ns: mod
      id: MOD:00834
    - ns: resid
      id: AA0422
    structure: CC(=O)N[C@H]1[C@H](OC[C@@H](C(=O)O)[NH3+])O[C@@H]([C@@H]([C@@H]1O)O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
    - molecule: Monomer
      element: H
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0450:
    id: AA0450
    name: 2'-methylsulfonyl-L-tryptophan
    comments: In virotoxin this modified tryptophan is formed after a 2'-(S-cysteinyl)tryptophan
      crosslink is broken.
    synonyms:
    - 2-methylsulfonyl-3-((2S)-2-amino-2-carboxyethyl)-1H-indole
    identifiers:
    - ns: mod
      id: MOD:01379
    - ns: resid
      id: AA0450
    structure: OC(=O)[C@H](Cc1c2ccccc2[nH]c1S(=O)(=O)C)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0077:
    id: AA0077
    name: N6-palmitoyl-L-lysine
    comments: 'Generating Enzyme: peptidyl-lysine N6-palmitoyltransferase (EC 2.3.1.-).'
    synonyms:
    - N6-(1-oxohexadecyl)-L-lysine
    - epsilon-palmitoyllysine
    - N(zeta)-palmitoyllysine
    - (2S)-2-amino-6-(hexadecanoylamino)hexanoic acid
    - 2-amino-6-(hexadecanamido)hexanoic acid
    identifiers:
    - ns: go
      id: GO:0018029
    - ns: cas
      id: 559012-43-0
    - ns: resid
      id: AA0077
    - ns: mod
      id: MOD:00086
    - ns: chebi
      id: CHEBI:21895
    structure: CCCCCCCCCCCCCCCC(=O)NCCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 28
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    - molecule: Monomer
      element: H
      position: 28
      charge: 1
  K, Y:
    id: AA0233
    name: 2'-(L-lys-N6-yl)-L-4',5'-topaquinone
    comments: The linkage between the two components has not been established with
      certainty. The relation of this cofactor to the copper binding site has not
      been established.
    synonyms:
    - lysyl oxidase cofactor
    - 1-[(S)-5-amino-5-carboxypentyl]amino-2-[(S)-2-amino-2-carboxyethyl]-2,6-cyclohexadien-4,5-dione
    - 2'-(L-lysine)-L-tyrosyl-4',5'-quinone
    - LTQ
    identifiers:
    - ns: go
      id: GO:0018124
    - ns: resid
      id: AA0233
    - ns: mod
      id: MOD:00238
    structure: O=C[C@H](CCCCNC1=CC(=O)C(=O)C=C1C[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - K
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  AA0094:
    id: AA0094
    name: L-phenylalanine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - phenylalaninamide
    - (2S)-2-amino-3-phenyl-propanamide
    - phenylalanine amide
    - F
    - L-phenylalaninamide
    - (2S)-2-amino-3-phenylpropanamide
    identifiers:
    - ns: chebi
      id: CHEBI:21371
    - ns: go
      id: GO:0018047
    - ns: cas
      id: 5241-58-7
    - ns: mod
      id: MOD:00103
    - ns: pdb.ligand
      id: NFA
    - ns: resid
      id: AA0094
    - ns: pdb-ccd
      id: NFA
    structure: '[NH3+][C@H](C(=O)N)Cc1ccccc1'
    base_monomers:
    - F
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  A, N:
    id: AA0515
    name: alanine isoaspartyl cyclopeptide
    comments: This is a proposed cyclization between asparagine and the free amino
      group of the preceding amino acid in a peptide. It is more probable that asparagine
      cyclizes with the amino group of the following glycine, see RESID:AA0441.
    synonyms:
    - (2S,5S)-2-methyl-3,7-dioxo-1,4-diazepane-5-carboxylic acid
    - 1,4.2-anhydro(L-alanyl-L-aspartic acid)
    identifiers:
    - ns: mod
      id: MOD:01618
    - ns: resid
      id: AA0515
    structure: OC[C@@H]1CC(=O)N[C@H](C(=O)N1)C
    base_monomers:
    - N
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  I, T:
    id: AA0472
    name: 4-(1-hydroxyethyl)-7-isoleucino-2-(threonin-O3-ylcarbonyl)-7,8-dihydroquinolin-8-ol
    synonyms:
    - (7R,8S)-7-[(1S,2S)-1-carboxy-2-methylbutyl]amino-2-([(1S,2R)-1-amino-1-carboxypropan-2-yl]oxy)carbonyl-8-hydroxy-4-[(1S)-1-hydroxyethyl]-7,8-dihydroquinoline
    identifiers:
    - ns: mod
      id: MOD:01395
    - ns: pdb.ligand
      id: QUA
    - ns: resid
      id: AA0472
    structure: CC[C@@H]([C@@H](C(=O)O)N[C@@H]1C=Cc2c([C@H]1O)nc(cc2[C@@H](O)C)C(=O)O[C@@H]([C@@H](C=O)[NH3+])C)C
    base_monomers:
    - I
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0618:
    id: AA0618
    name: O3-(poly-3-hydroxybutyrate)-L-serine
    comments: The mechanism for transfer of the polymer from the synthase is uncertain.
      The modification with two polymeric units is presented.
    synonyms:
    - O3-poly(3-hydroxybutyrate)serine
    - O3-poly(3-hydroxybutanoic acid)serine
    - O3-poly(beta-hydroxybutyrate)serine
    - (2S)-2-amino-3-[([(3R)-3-hydroxybutanoyl]oxy)-poly([(3R)-3-methyl-1-oxopropane-1,3-diyl]oxy)]propanoic
      acid
    - O3-poly[(R)-3-hydroxybutyrate]serine
    - O3-poly(3-hydroxybutanoate)serine
    - O3-poly(3-hydroxybutyric acid)serine
    identifiers:
    - ns: cas
      id: 29435-48-1
    - ns: resid
      id: AA0618
    - ns: mod
      id: MOD:01976
    structure: C[C@H](CC(=O)O[C@@H](CC(=O)OC[C@@H](C(=O)O)[NH3+])C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  C, K:
    id: AA0245
    name: L-lysine thiazole-4-carboxylic acid
    comments: Lysine is now thought not to be encoded in the peptide sequence modified
      to produce GE2270. See RESID:AA0470.
    synonyms:
    - 2-[(1S)-1,5-diaminopentyl]-1,3-thiazole-4-carboxylic acid
    - 2-[1,5-bis(azanyl)pentyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:00250
    - ns: go
      id: GO:0018141
    - ns: resid
      id: AA0245
    structure: OC(=O)c1csc(n1)[C@@H]([NH3+])CCCC[NH3+]
    base_monomers:
    - K
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0092:
    id: AA0092
    name: L-lysine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - lysinamide
    - 6-ammonio-L-norleucinamide
    - (2S)-2,6-diaminohexanamide
    - '[(5S)-5,6-diamino-6-oxo-hexyl]azanium'
    - K
    - 2,6-diamino-hexanoic acid amide
    identifiers:
    - ns: resid
      id: AA0092
    - ns: cas
      id: 32388-19-5
    - ns: chebi
      id: CHEBI:21353
    - ns: pdb-ccd
      id: LYN
    - ns: go
      id: GO:0018045
    - ns: mod
      id: MOD:00101
    - ns: pdb.ligand
      id: NH2
    structure: '[NH3+]CCCC[C@@H](C(=O)N)[NH3+]'
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0036:
    id: AA0036
    name: 3'-phospho-L-histidine
    comments: 'In the older biochemical literature this is usually called histidine-1-phosphate.
      See also RESID:AA0035. The crystallographic designation for the substituted
      nitrogen is delta-1, D1. Generating Enzyme: protein-histidine pros-kinase (EC
      2.7.3.11).'
    synonyms:
    - nd1-phosphonohistidine
    - (2S)-2-amino-3-(3-phosphonoimidazol-1-ium-4-yl)propanoic acid
    - pros-phosphohistidine
    - histidine-1-phosphate [misnomer]
    - N3-phosphonohistidine
    - 3-(1-phosphono-1H-imidazol-3-ium-5-yl)-L-alanine
    - H
    - ND1-phosphonohistidine
    - N(pi)-phosphohistidine
    - histidine-N(delta)-phosphate
    - 2-azanyl-3-(3-phosphono-3H-imidazol-4-yl)propanoic acid
    - histidine-N3'-phosphate
    - (2S)-2-amino-3-(3-phosphono-3H-imidazol-4-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HIP
    - ns: pdb.ligand
      id: HIP
    - ns: mod
      id: MOD:00045
    - ns: resid
      id: AA0036
    - ns: cas
      id: 5789-15-1
    - ns: go
      id: GO:0018106
    structure: OC(=O)[C@H](Cc1cncn1P(=O)([O-])[O-])[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  AA0502:
    id: AA0502
    name: 5-glutamyl 2-aminoadipic acid
    comments: 'Generating Enzyme: alpha-aminoadipate--LysW ligase, LysX (EC 6.3.2.-).'
    synonyms:
    - N2-(isoglutamyl)-2-aminoadipic acid
    - (2S)-2-([(4S)-4-amino-4-carboxybutanoyl]amino)hexanedioic acid
    - N2-(gamma-glutamyl)-2-aminoadipic acid
    identifiers:
    - ns: resid
      id: AA0502
    - ns: mod
      id: MOD:01605
    structure: O=C[C@H](CCC(=O)N[C@H](C(=O)[O-])CCCC(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  AA0086:
    id: AA0086
    name: L-glutamine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-aminopentanediamide
    - glutaminamide
    - L-glutamamide
    - (2~{S})-2-azanylpentanediamide
    - l-glutamamide
    identifiers:
    - ns: pdb-ccd
      id: '6E4'
    - ns: mod
      id: MOD:00095
    - ns: cas
      id: 2013-17-4
    - ns: chebi
      id: CHEBI:21309
    - ns: resid
      id: AA0086
    - ns: go
      id: GO:0018039
    - ns: pdb.ligand
      id: NH2
    structure: NC(=O)CC[C@@H](C(=O)N)[NH3+]
    base_monomers:
    - Q
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0351:
    id: AA0351
    name: S-(4a-FMN)-L-cysteine
    comments: 'This modification forms as an intermediate in light transduction and
      some redox reactions. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - 4a-(S-cysteinyl)FMN
    - (R)-2-amino-3-(4a-riboflavin 5'-dihydrogen phosphate)sulfanylpropanoic acid
    - 4a-(S-cysteinyl)flavin mononucleotide
    identifiers:
    - ns: go
      id: GO:0050742
    - ns: resid
      id: AA0351
    - ns: pdb.ligand
      id: FMN
    - ns: mod
      id: MOD:00356
    structure: O=C1NC(=O)[C@]2(C(=N1)N(C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)c1c(N2)cc(c(c1)C)C)SC[C@@H](C(=O)O)N
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 39
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 42
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 41
    - molecule: Monomer
      element: H
      position: 41
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 42
  AA0076:
    id: AA0076
    name: N6-methyl-L-lysine
    comments: 'Generating Enzyme: histone-lysine N-methyltransferase (EC 2.1.1.43);
      cytochrome-c-lysine N-methyltransferase (EC 2.1.1.59); calmodulin-lysine N-methyltransferase
      (EC 2.1.1.60).'
    synonyms:
    - N~6~-methyl-L-lysine
    - N(zeta)-methyllysine
    - (2S)-2-amino-6-methylaminohexanoic acid
    - K
    - epsilon-methyllysine
    - (2S)-2-amino-6-methylamino-hexanoic acid
    - n-methyl-lysine
    identifiers:
    - ns: pdb.ligand
      id: MLZ
    - ns: cas
      id: 1188-07-4
    - ns: resid
      id: AA0076
    - ns: mod
      id: MOD:00085
    - ns: go
      id: GO:0018024
    - ns: chebi
      id: CHEBI:61928
    - ns: pdb-ccd
      id: MLZ
    structure: C[NH2+]CCCC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  AA0304:
    id: AA0304
    name: L-beta-carboxyaspartic acid
    comments: This extremely acid labile modification has been detected but not located
      by sequencing in proteins.
    synonyms:
    - 2-amino-3-carboxybutanedioic acid
    - beta-carboxyaspartic acid
    - (2S)-2-aminoethane-1,1,2-tricarboxylic acid
    - 3-carboxyaspartic acid
    identifiers:
    - ns: resid
      id: AA0304
    - ns: mod
      id: MOD:00309
    - ns: go
      id: GO:0019803
    - ns: cas
      id: 75898-26-9
    structure: O=C[C@H](C(C(=O)[O-])C(=O)[O-])[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0265:
    id: AA0265
    name: 1-thioglycine
    comments: As a peptide this may exist predominantly in the iminyl-thiol [-C(SH)=N-]
      tautomeric form. See also RESID:AA0206.
    synonyms:
    - 2-amino-1-sulfanylethanone
    - 'aminoethanethioic O-acid #link INT'
    - 'aminoethanethiolic acid #link CTER'
    - 'aminoethanethionic acid #link INT'
    - aminoethanethioic S-acid
    - 'aminoethanethioic S-acid #link CTER'
    - aminoethanethioic acid
    - G
    - thioglycin
    - 2-aminoethanethioic S-acid
    - aminothioacetic acid
    identifiers:
    - ns: cas
      id: 758-10-1
    - ns: pdb.ligand
      id: GL3
    - ns: pdb-ccd
      id: GL3
    - ns: go
      id: GO:0018173
    - ns: mod
      id: MOD:00270
    - ns: resid
      id: AA0265
    - ns: mod
      id: MOD:01623
    structure: C([NH3+])C=S
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  AA0601:
    id: AA0601
    name: (3R)-3-hydroxy-L-arginine
    comments: 'The diastereomer (2S,3S)-3-hydroxyarginine is produced in non-ribosomal
      antibiotic peptides of Streptomyces vinaceus. Generating Enzyme: ribosomal protein
      L16 arginine hydroxylase ycfD (EC 1.14.11.-).'
    synonyms:
    - (2S,3R)-2-amino-5-[(diaminomethylidene)amino]-3-hydroxypentanoic acid
    - 2-amino-5-[(aminoiminomethyl)amino]-3-hydroxypentanoic acid [tautomer]
    - 2-amino-5-(carbamimidamido)-3-hydroxypentanoic acid [tautomer]
    - C(beta)-hydroxyarginine
    - beta-hydroxyarginine
    - 2-amino-5-guanidino-3-hydroxypentanoic acid
    identifiers:
    - ns: resid
      id: AA0601
    - ns: mod
      id: MOD:01956
    structure: O[C@@H]([C@@H](C(=O)O)[NH3+])CC[NH+]=C(N)N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0372:
    id: AA0372
    name: 1'-(phospho-5'-uridine)-L-histidine
    synonyms:
    - tele-5'-uridylic-L-histidine
    - (S)-2-amino-3-[1-(5'-uridine phosphono)imidazol-4-yl]propanoic acid
    - L-histidine monoanhydride with 5'-uridylic acid
    - N(tau)-5'-uridylic-L-histidine
    - L-histidine 5'-uridine phosphoramidester
    - N1'-uridylylated histidine
    identifiers:
    - ns: mod
      id: MOD:00377
    - ns: resid
      id: AA0372
    - ns: pdb.ligand
      id: U5P
    - ns: go
      id: GO:0051110
    structure: OC(=O)[C@@H](Cc1ncn(c1)[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1ccc(=O)[nH]c1=O)[O-])[NH3+]
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 37
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    - molecule: Monomer
      element: H
      position: 37
      charge: 1
  AA0528:
    id: AA0528
    name: 5-glutamyl serotonin
    comments: 'The structure shown in PubChem for this name is incorrect being instead
      alpha-glutamyl serotonin, which is not the product of transamidation. Generating
      Enzyme: protein-glutamine gamma-glutamyltransferase (EC 2.3.2.13).'
    synonyms:
    - (2S)-2-amino-5-([2-(5-hydroxy-1H-indol-3-yl)ethyl]amino)-5-oxopentanoic acid
    - N2-(gamma-glutamyl)-5-hydoxytryptamine
    - N5-[2-(5-hydroxy-3-indolyl)ethyl]glutamine
    identifiers:
    - ns: mod
      id: MOD:01775
    - ns: resid
      id: AA0528
    - ns: cas
      id: 61059-62-9
    structure: O=C(CC[C@@H](C(=O)O)[NH3+])NCCc1c[nH]c2c1cc(O)cc2
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0275:
    id: AA0275
    name: N-pyruvic acid 2-iminyl-L-valine
    synonyms:
    - (S)-2-(1-carboxy-2-methylpropanimino)propanoic acid
    identifiers:
    - ns: resid
      id: AA0275
    - ns: mod
      id: MOD:00280
    - ns: go
      id: GO:0018388
    structure: O=C[C@H](C(C)C)[NH2+][C@H](C(=O)[O-])C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AA0178:
    id: AA0178
    name: L-thyroxine
    synonyms:
    - O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-L-tyrosine
    - (S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid
    - T4
    - 3,3',5,5'-tetraiodo-L-thyronine
    - 3,5,3',5'-tetraiodo-L-thyronine
    - 3',3'',5',5''-tetraiodo-L-thyronine
    - 4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-L-phenylalanine
    identifiers:
    - ns: go
      id: GO:0018078
    - ns: cas
      id: 51-48-9
    - ns: resid
      id: AA0178
    - ns: chebi
      id: CHEBI:18332
    - ns: pdb.ligand
      id: T44
    - ns: mod
      id: MOD:00187
    structure: OC(=O)[C@H](Cc1cc(I)c(c(c1)I)Oc1cc(I)c(c(c1)I)O)[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  C, R:
    id: AA0553
    name: 2-(4-guanidinobutanoyl)-5-hydroxy-imidazole-4-carbothionic
    comments: The amino group of the following amino acid forms a thiopeptide bond.
      This is an amino(sulfanyl)methylidene in the tautomeric form, which is shown
      in the diagram and model.
    synonyms:
    - 2-(4-guanidinobutanoyl)-5-hydroxy-1H-imidazole-4-carbothioic O-acid
    - (4Z)-2-(4-guanidinobutanoyl)-5-oxo-4-(sulfanylmethylidene)-4,5-dihydro-1H-imidazole
    - 2-(4-guanidinobutanoyl)-5-hydroxy-4-thioformyl-1H-imidazole [tautomer]
    identifiers:
    - ns: mod
      id: MOD:01877
    - ns: resid
      id: AA0553
    structure: '[S-]/C=C/1\N=C(NC1=O)C(=O)CCC[NH+]=C(N)N'
    base_monomers:
    - R
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
  AA0620:
    id: AA0620
    name: N,N-dimethylglyine
    comments: 'This modification is a minor post-translational modification in the
      incomplete trimethylation of N-terminal glycine. See also RESID:AA0063 and RESID:AA0619.
      This modification is readily formed artifactually from N-terminal glycine by
      reductive methylation using formaldehyde. It is not clear whether "N-terminal
      methyltransferase" defined in EC 2.1.1.244 is intended to exclude an enzyme
      activity that methylates N-terminal glycine, or whether there are distinguishable
      enzyme activities. Generating Enzyme: protein N-terminal methyltransferase (EC
      2.1.1.244).'
    synonyms:
    - 1-carboxy-N,N-dimethylaminomethane
    - (dimethylamino)ethanoic acid
    - 2-(dimethylamino)acetic acid
    - vitamin B16
    identifiers:
    - ns: cas
      id: 1118-68-9
    - ns: pdb.ligand
      id: DMG
    - ns: mod
      id: MOD:01983
    - ns: chebi
      id: CHEBI:17724
    - ns: resid
      id: AA0620
    structure: OC(=O)C[NH+](C)C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0253:
    id: AA0253
    name: S-(2-aminovinyl)-3-methyl-D-cysteine
    comments: 'This cross-link arises from the decarboxylation of the carboxyl-terminal
      portion of 3-methyllanthionine. Generating Enzyme: peptidyl-phosphoserine/phosphothreonine
      dehydratase (EC 4.2.1.-); peptidyl-cysteine dehydroalanine/dehydrobutyrine ligase
      (EC 6.2.-.-).'
    synonyms:
    - alpha-aminobutyric acid
    - decarboxylated methyllanthionine
    - (2S)-2-aminobutanoic acid
    - (2S)-2-azanylbutanoic acid
    - (2S,3S)-2-amino-3-[((Z)-2-aminoethenyl)sulfanyl]butanoic acid
    - A
    - 2-amino-3-[(2-aminovinyl)sulfanyl]butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ABA
    - ns: resid
      id: AA0253
    - ns: mod
      id: MOD:00258
    - ns: pdb.ligand
      id: ABA
    - ns: go
      id: GO:0018162
    structure: C[C@@H]([C@H]([NH3+])C(=O)O)S/C=C\N
    base_monomers:
    - T
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0186:
    id: AA0186
    name: lactic acid
    comments: 'The stereochemistry has not been determined in all the peptides with
      this modification. Generating Enzyme: protein-serine dehydratase ElxB (EC 4.2.1.-);
      D-lactoyl-protein dehydrogenase ElxO (EC 1.1.1.-).'
    synonyms:
    - 2-hydroxypropionic acid
    - alpha-hydroxypropionic acid
    - (2R)-2-hydroxypropanoic acid
    identifiers:
    - ns: resid
      id: AA0186
    - ns: pdb.ligand
      id: LAC
    - ns: cas
      id: 10326-41-7
    - ns: go
      id: GO:0018084
    - ns: chebi
      id: CHEBI:42111
    - ns: mod
      id: MOD:00194
    structure: OC(=O)[C@@H](O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0585:
    id: AA0585
    name: N6-phospho-L-lysine
    comments: N6-phospho-L-lysine hydrolyzes rapidly at acidic pH, but is more stable
      at neutral pH and below freezing. Although N6-phospho-L-lysine has been proposed
      to occur in histone H1, its occurrence has not been reported in a sequenced
      peptide.
    synonyms:
    - N(epsilon)-phosphoryllysine
    - (2S)-2-amino-6-(phosphonoamino)hexanoic acid
    - N(epsilon)-phospholysine
    - N(epsilon)-phosphonolysine
    - (2S)-2-azanyl-6-(phosphonoamino)hexanoic acid
    - 6-phospholysine
    - N(6)-phosphonolysine
    - N(epsilon)-phosphonyllysine
    identifiers:
    - ns: cas
      id: 14721-74-5
    - ns: resid
      id: AA0585
    - ns: mod
      id: MOD:01931
    structure: '[NH3+][C@H](C(=O)O)CCCCNP(=O)([O-])[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0110:
    id: AA0110
    name: L-lanthionine
    comments: This diastereomeric form, which retains the conformation of the R chiral
      center of L-cysteine, does occur naturally but is not common. See RESID:AA0111.
    synonyms:
    - (R,R)-2,6-diamino-4-thiaheptanedioic acid
    - 3,3'-thiobis-L-alanine
    - (R)-S-(2-amino-2-carboxyethyl)-L-cysteine
    - (R,R)-3,3'-thiobis-(2-aminopropanoic acid)
    - 2-amino-3-(2-amino-2-carboxyethyl)sulfanylpropanoic acid
    - (R,R)-bis(2-amino-2-carboxyethyl)sulfide
    - (2R,2'R)-3,3'-sulfanediylbis(2-aminopropanoic acid)
    identifiers:
    - ns: mod
      id: MOD:01837
    - ns: chebi
      id: CHEBI:21347
    - ns: go
      id: GO:0018081
    - ns: cas
      id: 922-55-4
    - ns: resid
      id: AA0110
    - ns: mod
      id: MOD:00119
    structure: O=C[C@H](CSC[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0315:
    id: AA0315
    name: 4-(S-L-cysteinyl)-L-glutamic acid
    synonyms:
    - (2S,4S)-2-amino-4-[(R)-2-amino-2-carboxyethyl]sulfanylpentanedioic acid
    - (2S,3S,7R)-2,7-diamino-4-carboxy-5-thiaoctanedioic acid
    identifiers:
    - ns: go
      id: GO:0019929
    - ns: resid
      id: AA0315
    - ns: mod
      id: MOD:00320
    - ns: chebi
      id: CHEBI:20293
    structure: O=C[C@H](CS[C@H](C(=O)[O-])C[C@@H](C=O)[NH3+])[NH3+]
    base_monomers:
    - E
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  C, I:
    id: AA0466
    name: L-isoleucine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[1-zanyl-2-methylbutyl]-1,3-thiazole-4-carboxylic acid
    - 2-[(1S,2S)-1-amino-2-methylbutyl]-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01389
    - ns: pdb.ligand
      id: BB9
    - ns: resid
      id: AA0466
    structure: C[C@H]([C@H]([NH3+])c1nc(cs1)C(=O)O)CC
    base_monomers:
    - I
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
  AA0111:
    id: AA0111
    name: meso-lanthionine
    comments: 'This diastereomeric form, despite the appearance of the same stereochemical
      designator, inverts the conformation of the S chiral center of L-serine to a
      D-alanine skeleton with S chiralty because of the altered prority of the beta-carbon.
      The stereosymmetry of the meso-form is broken within a peptide chain. Generating
      Enzyme: peptidyl-phosphoserine/phosphothreonine dehydratase (EC 4.2.1.-); peptidyl-cysteine
      dehydroalanine/dehydrobutyrine ligase (EC 6.2.-.-).'
    synonyms:
    - (2S,6R)-meso-lanthionine [misnomer]
    - (R)-S-(2-amino-2-carboxyethyl)-D-cysteine
    - (2S)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]sulfanyl]propanoic acid
    - (R,S)-bis(2-amino-2-carboxyethyl)sulfide
    - (2R,2'S)-3,3'-sulfanediylbis(2-aminopropanoic acid)
    - (2R,2'S)-3,3'-thiobis-(2-aminopropanoic acid)
    - (2R,6S)-meso-lanthionine
    - (2R,6S)-2,6-diamino-4-thiaheptanedioic acid
    - 3,3'-thiobis-meso-alanine
    - cysteine-3-D-alanine thioether
    identifiers:
    - ns: pdb.ligand
      id: DAL
    - ns: cas
      id: 922-56-5
    - ns: mod
      id: MOD:00120
    - ns: go
      id: GO:0018081
    - ns: resid
      id: AA0111
    - ns: chebi
      id: CHEBI:25013
    structure: O=C[C@H](CSC[C@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0072:
    id: AA0072
    name: L-glutamic acid 5-methyl ester
    comments: 'Glutamate methylesterase can also act as a glutamine amidohydrolase.
      Generating Enzyme: protein-glutamate O-methyltransferase (EC 2.1.1.80).'
    synonyms:
    - (2S)-2-amino-5-methoxy-5-oxopentanoic acid
    - 5-methyl L-glutamate
    - (5)-methyl L-hydrogen glutamate
    - 5-methyl L-2-aminoglutarate
    - glutamic acid 5-methyl ester
    - glutamic acid gamma-methyl ester
    - 2-aminopentanedioic acid 5-methyl ester
    identifiers:
    - ns: go
      id: GO:0008983
    - ns: mod
      id: MOD:00657
    - ns: cas
      id: 1499-55-4
    - ns: resid
      id: AA0072
    - ns: go
      id: GO:0018390
    - ns: mod
      id: MOD:00081
    structure: COC(=O)CC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - E
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0404:
    id: AA0404
    name: O-fucosyl-L-serine
    comments: 'See also RESID:AA0154, RESID:AA0208, RESID:AA0209, RESID:AA0210, RESID:AA0291,
      RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398, RESID:AA0400, RESID:AA0402,
      RESID:AA0406, and RESID:AA0422 for other O-glycosylated serines. Generating
      Enzyme: peptide-O-fucosyltransferase (EC 2.4.1.221).'
    synonyms:
    - O3-fucosylserine
    - (2S)-2-amino-3-(6-deoxy-alpha-D-galactopyranosyloxy)propanoic acid
    - O-glycosylserine
    identifiers:
    - ns: resid
      id: AA0404
    - ns: mod
      id: MOD:00812
    structure: OC(=O)[C@H](CO[C@H]1O[C@H](C)[C@@H]([C@@H]([C@H]1O)O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  AA0232:
    id: AA0232
    name: L-beta-methylthioaspartic acid
    comments: 'The stereochemistry for the second chiral center has not been resolved.
      The (2R,3S) form is shown. beta-Methylthioaspartic acid probably occurs uniquely
      in ribosomal protein S12. Althouh the aspartic acid is invariant, the modification
      is not required for activity. Generating Enzyme: ribosomal protein S12 methylthiotransferase
      RimO (EC 2.-.-.-).'
    synonyms:
    - 3-methylthio-aspartic acid
    - 3-carboxy-S-methyl-cysteine
    - beta-methylthio-aspartic acid
    - (2R,3Xi)-2-amino-3-(methylsulfanyl)butanedioic acid
    identifiers:
    - ns: cas
      id: 180420-54-6
    - ns: go
      id: GO:0018339
    - ns: resid
      id: AA0232
    - ns: mod
      id: MOD:00237
    structure: CS[C@@H]([C@@H](C=O)[NH3+])C(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  AA0071:
    id: AA0071
    name: N5-methyl-L-glutamine
    synonyms:
    - gamma-methylglutamine
    - (2S)-2-amino-5-methylamino-5-oxo-pentanoic acid
    - N-methylglutamine
    - N-methyl-L-glutamine
    - (2S)-2-amino-5-methylamino-5-oxopentanoic acid
    - N(delta)-methylglutamine
    - n5-methylglutamine
    - 2-amino-N5-methylpentanediamic acid
    - Q
    identifiers:
    - ns: pdb.ligand
      id: MEQ
    - ns: pdb-ccd
      id: MEQ
    - ns: go
      id: GO:0018019
    - ns: resid
      id: AA0071
    - ns: cas
      id: 3031-62-7
    - ns: chebi
      id: CHEBI:61891
    - ns: mod
      id: MOD:00080
    structure: CNC(=O)CC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  AA0303:
    id: AA0303
    name: L-glutamimide
    comments: This modification is autocatalytically produced from the carboxyl-terminal
      glutamine of spliced inteins.
    synonyms:
    - 2-aminopentanimide
    - alpha-aminoglutarimide
    - 3-amino-2,6-piperidinedione
    - (3S)-3-aminopiperidine-2,6-dione
    identifiers:
    - ns: cas
      id: 2353-44-8
    - ns: go
      id: GO:0019802
    - ns: resid
      id: AA0303
    - ns: mod
      id: MOD:00308
    structure: N[C@H]1CCC(=O)NC1=O
    base_monomers:
    - Q
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0504:
    id: AA0504
    name: 5-glutamyl allysine
    synonyms:
    - alpha-(gamma-glutamyl)allysine
    - 2-(5-glutamyl)amino-6-oxohexanoic acid
    - (2S)-2-([(4S)-4-amino-4-carboxybutanoyl]amino)-6-oxohexanoic acid
    - N2-(isoglutamyl)allysine
    - N2-(gamma-glutamyl)allysine
    identifiers:
    - ns: resid
      id: AA0504
    - ns: mod
      id: MOD:01607
    structure: O=CCCC[C@@H](C(=O)[O-])NC(=O)CC[C@@H](C=O)[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0322:
    id: AA0322
    name: 3-hydroxy-L-tryptophan
    synonyms:
    - (2S,3S)-2-amino-3-hydroxy-3-(1H-indol-3-yl)propanoic acid
    - (betaS)-beta-hydroxy-L-tryptophan
    - beta-hydroxytryptophane
    - W
    - 3-hydroxytryptophan
    - beta-hydroxytryptophan
    identifiers:
    - ns: pdb-ccd
      id: HTR
    - ns: go
      id: GO:0045325
    - ns: mod
      id: MOD:00327
    - ns: pdb.ligand
      id: HTR
    - ns: resid
      id: AA0322
    structure: OC(=O)[C@H]([C@H](c1c[nH]c2c1cccc2)O)N
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
  AA0089:
    id: AA0089
    name: L-histidine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - histidinamide
    - (2S)-2-amino-3-(1H-imidazol-4-yl)propanamide
    - H
    - L-histidinamide
    - (2S)-2-amino-3-(3H-imidazol-4-yl)propanamide
    - l-histidine amide
    identifiers:
    - ns: pdb.ligand
      id: HIA
    - ns: chebi
      id: CHEBI:43042
    - ns: mod
      id: MOD:00098
    - ns: resid
      id: AA0089
    - ns: pdb-ccd
      id: HIA
    - ns: go
      id: GO:0018042
    - ns: cas
      id: 7621-14-9
    structure: NC(=O)[C@@H]([NH3+])Cc1cnc[nH]1
    base_monomers:
    - H
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0363:
    id: AA0363
    name: N-carboxy-L-methionine
    comments: At least three protein crystallographic structures have been reported
      with this modification. However, no chemical evidence for this modification
      is provided, there were no reports of this modification before these crystallographic
      reports, and there is no metabolic explanation for the conversion of a formyl
      group to a carboxy group. There is confusion in its description, and misnaming
      is common. This modification is probably a misidentification of N-(dihydroxymethyl)methionine,
      the hydrated form of N-formylmethionine. See RESID:AA0493.
    synonyms:
    - N-carboxy-L-methionine
    - (2S)-2-(carboxyamino)-4-methylsulfanyl-butanoic acid
    - (S)-2-carboxyamino-4-(methylsulfanyl)butanoic acid
    - n-carboxymethionine
    - N-carboxymethionine
    - M
    - 2-carbamic-4-(methylsulfanyl)butanoic acid
    - 2-carbamic-4-(methylthio)butanoic acid
    identifiers:
    - ns: pdb.ligand
      id: CXM
    - ns: mod
      id: MOD:00368
    - ns: go
      id: GO:0050988
    - ns: pdb-ccd
      id: CXM
    - ns: resid
      id: AA0363
    - ns: chebi
      id: CHEBI:61924
    structure: '[O-]C(=O)N[C@H](C(=O)O)CCSC'
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0063:
    id: AA0063
    name: N-methylglycine
    comments: 'Sarcosine occurs internally in some nonencoded peptides. It has been
      observed as a minor post-translational modification arising from the incomplete
      trimethylation of N-terminal glycine.  See RESID:AA0619 and RESID:AA0620. Polypeptides
      with monomethylated amino terminals can undergo premature cleavage during the
      coupling step of an Edman degradation. This can result in "preview" with both
      a residue and the following residue being seen from the first step on through
      a sequence. It is not clear whether "N-terminal methyltransferase" defined in
      EC 2.1.1.244 is intended to exclude an enzyme activity that methylates N-terminal
      glycine, or whether there are distinguishable enzyme activities. Generating
      Enzyme: protein N-terminal methyltransferase (EC 2.1.1.244).'
    synonyms:
    - L-sarcosine
    - methylaminoethanoic acid
    - methylaminoacetic acid
    identifiers:
    - ns: pdb.ligand
      id: SAR
    - ns: mod
      id: MOD:00072
    - ns: resid
      id: AA0063
    - ns: cas
      id: 107-97-1
    - ns: go
      id: GO:0018013
    - ns: chebi
      id: CHEBI:15611
    structure: C[NH2+]CC(=O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  AA0519:
    id: AA0519
    name: O-(ADP-ribosyl)-L-threonine
    comments: 'It is not known whether Photorhabdus luminescens toxin catalyzes formation
      of the alpha or beta isomer. The alpha form is presented. The keyword "phosphoprotein"
      is not used with toxin modification. Generating Enzyme: NAD(P)+--threonine ADP-ribosyltransferase
      TccC3 (EC 2.4.2.-).'
    synonyms:
    - (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-butanoic
      acid
    - O3-alpha-D-ribofuranosyl-L-threonine 5'->5'-ester with adenosine 5'-(trihydrogen
      diphosphate)
    - O3-(ADP-ribosyl)-L-threonine
    - O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-threonine
    identifiers:
    - ns: resid
      id: AA0519
    - ns: mod
      id: MOD:01663
    structure: OC(=O)[C@H]([C@H](O[C@H]1O[C@H]([C@H]([C@H]1O)O)CO[P@@](=O)(O[P@](=O)(OC[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1NC=N[C@H]2N)[O-])[O-])C)[NH3+]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 54
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 54
    - molecule: Monomer
      element: H
      position: 54
      charge: 1
  AA0311:
    id: AA0311
    name: N4,N4-dimethyl-L-asparagine
    comments: This structure has not been confirmed.
    synonyms:
    - (2S)-2-amino-4-dimethylamino-4-oxo-butanoic acid
    - beta-dimethylasparagine [misnomer]
    - N,N-dimethyl-L-asparagine
    - N(gamma),N(gamma)-dimethylasparagine
    - 2-amino-N4,N4-dimethylbutanediamic acid
    - n4,n4-dimethyl-asparagine
    - (2S)-2-amino-4-(dimethylamino)-4-oxobutanoic acid
    - N
    identifiers:
    - ns: mod
      id: MOD:00316
    - ns: pdb-ccd
      id: DMH
    - ns: resid
      id: AA0311
    - ns: pdb.ligand
      id: DMH
    - ns: go
      id: GO:0019710
    structure: N[C@H](C(=O)O)CC(=O)N(C)C
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AA0316:
    id: AA0316
    name: cis-14-hydroxy-10,13-dioxo-7-heptadecenoic acid L-aspartate ester
    comments: The stereochemistry for the second chiral center has not been resolved.
      The (14S) form is shown.
    synonyms:
    - (7Z,14Xi)-14-[(S)-3-amino-3-carboxy-propanoyl]oxy-10,13-dioxo-7-heptadecenoic
      acid
    - barley lipid transfer protein modification
    identifiers:
    - ns: mod
      id: MOD:00321
    - ns: go
      id: GO:0019930
    - ns: resid
      id: AA0316
    structure: CCC[C@@H](C(=O)CCC(=O)C/C=C\CCCCCC(=O)[O-])OC(=O)C[C@@H](C=O)[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  AA0042:
    id: AA0042
    name: N-acetyl-L-aspartic acid
    comments: 'Generating Enzyme: aspartate N-acetyltransferase (EC 2.3.1.17).'
    synonyms:
    - 2-(acetylamino)butanedioic acid
    - 2-(acetylazanyl)butanedioic acid
    - acetylaspartic acid
    - (2S)-2-(acetamido)butanedioic acid
    identifiers:
    - ns: cas
      id: 997-55-7
    - ns: go
      id: GO:0017190
    - ns: mod
      id: MOD:00051
    - ns: chebi
      id: CHEBI:21547
    - ns: resid
      id: AA0042
    structure: O=C[C@@H](NC(=O)C)CC(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  AA0156:
    id: AA0156
    name: 1'-mannosyl-L-tryptophan
    comments: In 1992, the hexose was not identified and it was proposed, but not
      established, that this modification had an N-linked glycosidic bond. After C-linked
      2'-mannosyltryptophan was found in vertebrate proteins, it was generally assumed
      that the tryptophan N-glycoside structure was wrong. See RESID:AA0217 for 2'-mannosyltryptophan.
      The alpha anomeric form is shown.
    synonyms:
    - (2S)-2-amino-3-(1-D-mannopyranosyloxy-1H-indol-3-yl)propanoic acid
    - N-mannosyl-tryptophan
    - 1'-glycosyl-L-tryptophan
    - N1-mannosyl-tryptophan
    identifiers:
    - ns: resid
      id: AA0156
    - ns: mod
      id: MOD:00165
    - ns: go
      id: GO:0006487
    structure: OC[C@H]1O[C@@H]([C@H]([C@H]([C@@H]1O)O)O)n1cc(c2c1cccc2)C[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 29
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 32
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
    - molecule: Monomer
      element: H
      position: 31
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    - molecule: Monomer
      element: H
      position: 32
      charge: 1
  AA0364:
    id: AA0364
    name: O-acetyl-L-serine
    synonyms:
    - serine acetate ester
    - o-acetylserine
    - (2S)-3-acetyloxy-2-amino-propanoic acid
    - O-acetyl-L-serine
    - (2S)-3-(acetyloxy)-2-aminopropanoic acid
    - O-acetylserine
    - S
    identifiers:
    - ns: mod
      id: MOD:00369
    - ns: go
      id: GO:0030919
    - ns: pdb-ccd
      id: OAS
    - ns: cas
      id: 4985-36-8
    - ns: resid
      id: AA0364
    - ns: pdb.ligand
      id: OAS
    - ns: chebi
      id: CHEBI:17981
    structure: CC(=O)OC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AA0091:
    id: AA0091
    name: L-leucine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - L-leucinamide
    - 2-azanyl-4-methylpentanamide
    - 2-amino-4-methylvaleramide
    - alpha-aminoisocaproamide
    - l-leucinamide
    - (2S)-2-amino-4-methylpentanamide
    - (2~{S})-2-azanyl-4-methyl-pentanamide
    - L
    - leucinamide
    identifiers:
    - ns: chebi
      id: CHEBI:21349
    - ns: mod
      id: MOD:00100
    - ns: cas
      id: 687-51-4
    - ns: resid
      id: AA0091
    - ns: pdb-ccd
      id: NLW
    - ns: pdb.ligand
      id: NH2
    - ns: go
      id: GO:0018044
    structure: '[NH3+][C@H](C(=O)N)CC(C)C'
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0065:
    id: AA0065
    name: N-methyl-L-phenylalanine
    comments: 'Polypeptides with monomethylated amino terminals can undergo premature
      cleavage during the coupling step of an Edman degradation. This can result in
      "preview" with both a residue and the following residue being seen from the
      first step on through a sequence. Generating Enzyme: prepilin peptidase (EC
      3.4.23.43).'
    synonyms:
    - N-methylphenylalanine
    - (2S)-2-methylamino-3-phenylpropanoic acid
    - (2S)-2-(methylamino)-3-phenyl-propanoic acid
    - F
    - n-methylphenylalanine
    - N-methyl-L-phenylalanine
    identifiers:
    - ns: chebi
      id: CHEBI:61884
    - ns: resid
      id: AA0065
    - ns: pdb.ligand
      id: MEA
    - ns: go
      id: GO:0018015
    - ns: pdb-ccd
      id: MEA
    - ns: cas
      id: 2566-30-5
    - ns: mod
      id: MOD:00074
    structure: OC(=O)[C@H](Cc1ccccc1)[NH2+]C
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  AA0144:
    id: AA0144
    name: 3'-(8alpha-FAD)-L-histidine
    comments: 'The arrangement of the attachment has not been completely established
      in some cases. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - 8alpha-N1-histidyl FAD [misnomer]
    - pros-(8alpha-FAD)-histidine
    - 8alpha-(N(delta)-histidyl)FAD
    - N(pi)-(8alpha-FAD)-histidine
    - 8alpha-(N3'-histidyl)FAD
    - (2S)-2-amino-3-(3-[8alpha-riboflavin 5'-(trihydrogen diphosphate) 5'->5'-ester
      with adenosine]imidazol-4-yl)propanoic acid
    identifiers:
    - ns: mod
      id: MOD:00153
    - ns: pdb.ligand
      id: FAD
    - ns: resid
      id: AA0144
    - ns: go
      id: GO:0018295
    structure: O=C1[N-]C(=O)C2C(N1)N(C[C@@H]([C@@H]([C@@H](CO[P@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc3c1ncnc3N)[O-])[O-])O)O)O)C1C(N2)CC(C(C1)Cn1cncc1C[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 68
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 71
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 70
    - molecule: Monomer
      element: H
      position: 70
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 71
    - molecule: Monomer
      element: H
      position: 71
      charge: 1
  AA0277:
    id: AA0277
    name: S-selenyl-L-cysteine
    synonyms:
    - 2-amino-3-hydroselenosulfidopropanoic acid
    - 2-amino-3-hydroselenylsulfidopropanoic acid
    - 2-amino-3-hydroselenylthiopropanoic acid
    - S-selanylcysteine
    - S-selanyl-L-cysteine
    - C
    - cysteine perselenide [misnomer]
    - (2R)-2-amino-3-selanylsulfanyl-propanoic acid
    - (R)-2-amino-3-(selanylsulfanyl)propanoic acid
    - S-selenylcysteine
    - s-selanyl cysteine
    identifiers:
    - ns: resid
      id: AA0277
    - ns: go
      id: GO:0018183
    - ns: pdb.ligand
      id: CSZ
    - ns: pdb-ccd
      id: CSZ
    - ns: mod
      id: MOD:00282
    structure: OC(=O)[C@@H]([NH3+])CS[SeH]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0624:
    id: AA0624
    name: 2-(L-cystein-S-yl)-D-serine
    synonyms:
    - (2S)-2-amino-2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-3-hydroxypropanoic acid
    - (2R,5S)-2,5-diamino-5-carboxy-6-hydroxy-4-thiahexanoic acid
    identifiers:
    - ns: pdb.ligand
      id: DSN
    - ns: mod
      id: MOD:01987
    - ns: resid
      id: AA0624
    structure: O=C[C@H](CS[C@](C(=O)O)(CO)N)[NH3+]
    base_monomers:
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0616:
    id: AA0616
    name: S-methyl-L-methionine
    comments: 'Generating Enzyme: autocatalytic.'
    synonyms:
    - S-methylmethioninium
    - (3S)-(3-amino-3-carboxypropyl)dimethylsulfanium
    - vitamin U
    - S-methylmethionine
    - '[(3S)-3-amino-3-carboxypropyl](dimethyl)sulfonium'
    - (2S)-2-amino-4-(dimethylsulfonio)butanoate
    identifiers:
    - ns: cas
      id: 4727-40-6
    - ns: chebi
      id: CHEBI:17728
    - ns: mod
      id: MOD:01974
    - ns: resid
      id: AA0616
    structure: '[NH3+][C@H](C(=O)O)CC[S](C)C'
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0132:
    id: AA0132
    name: S-phycoerythrobilin-L-cysteine
    comments: See the comment for S-phycocyanobilin-L-cysteine (RESID:AA0131). There
      is an additional chiral center at C-16. The phytochromobilins and phycoerythrobilins
      transmit red.
    synonyms:
    - PEB
    - 18-ethenyl-3-[1-((2-amino-2-carboxy)ethylsulfanyl)ethyl]-2,3,15,16-tetrahydro-2,7,13,17-tetramethyl-1,19-dioxo-(21H,22H,24H)-bilin-8,12-dipropanoic
      acid
    - phycoerythrobilin cysteine adduct
    - (2S,3R,16R)-18-ethenyl-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-2,7,13,17-tetramethyl-2,3,15,16-tetrahydrobilin-1,19(21H,22H,24H)-dione
    identifiers:
    - ns: resid
      id: AA0132
    - ns: pdb.ligand
      id: PEB
    - ns: go
      id: GO:0017011
    - ns: mod
      id: MOD:00141
    - ns: chebi
      id: CHEBI:15618
    - ns: cas
      id: 18097-67-1
    structure: O=C[C@H](CS[C@@H]([C@H]1/C(=C/[C@@H]2[NH2+]/C(=C\c3[nH]c(c(c3CCC(=O)[O-])C)C[C@H]3NC(=O)C(=C3C)C=C)/C(=C2C)CCC(=O)[O-])/NC(=O)[C@H]1C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  AA0046:
    id: AA0046
    name: N-acetylglycine
    synonyms:
    - aceturic acid
    - (acetylazanyl)ethanoic acid
    - 2-(acetylamino)ethanoic acid
    - 2-(acetamido)ethanoic acid
    - (acetylamino)acetic acid
    identifiers:
    - ns: mod
      id: MOD:00055
    - ns: resid
      id: AA0046
    - ns: cas
      id: 543-24-8
    - ns: go
      id: GO:0017193
    - ns: chebi
      id: CHEBI:61888
    structure: CC(=O)NCC(=O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  AA0179:
    id: AA0179
    name: 6'-bromo-L-tryptophan
    synonyms:
    - 6-bromo-L-tryptophan
    - 6-bromo-tryptophan
    - (2S)-2-amino-3-(6-bromo-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: cas
      id: 52448-17-6
    - ns: pdb.ligand
      id: BTR
    - ns: chebi
      id: CHEBI:61899
    - ns: go
      id: GO:0018080
    - ns: mod
      id: MOD:00188
    - ns: pdb-ccd
      id: BTR
    - ns: resid
      id: AA0179
    structure: OC(=O)[C@H](Cc1c[nH]c2c1ccc(c2)Br)[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0182:
    id: AA0182
    name: (Z)-dehydrobutyrine
    comments: 'In some cases it has not been firmly established whether the natural
      form is the Z or the E isomer. For the E isomer, see RESID:AA0547. A 2,3-didehydro
      amino acid blocks Edman degradation. Generating Enzyme: protein-threonine dehydratase
      (EC 4.2.1.-); phosphothreonine lyase (EC 4.3.2.-).'
    synonyms:
    - 2,3-didehydrobutyrine
    - 3-methyldehydroalanine
    - (2Z)-2-aminobut-2-enoic acid
    - anhydrothreonine
    - (Z)-2-aminobutenoic acid
    - Dhb
    - (Z)-2-amino-2-butenoic acid
    - methyl-dehydroalanine
    - alpha,beta-dehydroaminobutyric acid
    identifiers:
    - ns: pdb.ligand
      id: DBU
    - ns: mod
      id: MOD:00190
    - ns: go
      id: GO:0018082
    - ns: cas
      id: 71018-10-5
    - ns: resid
      id: AA0182
    structure: C/C=C(/C(=O)O)\N
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  AA0222:
    id: AA0222
    name: omega-N-phospho-L-arginine
    comments: 'Generating Enzyme: histone-arginine kinase (EC 2.7.3.-); protein-arginine
      kinase (EC 2.7.3.-).'
    synonyms:
    - phosphoarginine
    - N5-[imino(phosphonoamino)methyl]-L-ornithine
    - (2S)-2-amino-5-([amino(phosphonoamino)methylidene]amino)pentanoic acid
    - (2S)-2-amino-5-(N'-phosphonocarbamimidamido)pentanoic acid
    - N(omega)-phosphono-L-arginine
    - alpha-amino-delta-phosphonoguanidinovaleric acid
    - N(gamma)-phosphoarginine
    identifiers:
    - ns: mod
      id: MOD:00227
    - ns: go
      id: GO:0018109
    - ns: cas
      id: 1189-11-3
    - ns: resid
      id: AA0222
    structure: OC(=O)[C@H](CCC/[NH+]=C(\NP(=O)([O-])[O-])/N)[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0196:
    id: AA0196
    name: D-asparagine
    comments: 'Generating Enzyme: protein-asparagine epimerase (EC 5.1.1.-).'
    synonyms:
    - D-aspartic acid beta-amide
    - (R)-2-amino-4-butanediamic acid
    - D-alpha-aminosuccinamic acid
    identifiers:
    - ns: pdb.ligand
      id: DSG
    - ns: resid
      id: AA0196
    - ns: cas
      id: 2058-58-4
    - ns: mod
      id: MOD:00203
    - ns: go
      id: GO:0018091
    - ns: chebi
      id: CHEBI:29957
    structure: NC(=O)C[C@H](C(=O)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AA0131:
    id: AA0131
    name: S-phycocyanobilin-L-cysteine
    comments: 'A second linkage, an ester between a serine and one of the propanoic
      acid groups, was reported at one time but was not confirmed. A second cysteine
      linkage has also been reported to a moiety thought to be phycocyanobilin. The
      phycocyanobilins transmit blue. Generating Enzyme: phycocyanobilin lyase (EC
      4.4.1.-).'
    synonyms:
    - PCB
    - phycobilin cysteine
    - (2R,3R)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-18-ethyl-1,2,3,19,21,22,24-heptahydro-2,7,13,17-tetramethyl-1,19-dioxo-(21H,22H,24H)-bilin-8,12-dipropanoic
      acid
    - phycocyanobilin cysteine adduct
    - (2R,3R)-3-[(1R)-1-(((2R)-2-amino-2-carboxy)ethylsulfanyl)ethyl]-8,12-bis(2-carboxyethyl)-18-ethyl-2,7,13,17-tetramethyl-1,2,3,19,21,22,24-heptahydrobilin-1,19(21H,22H,24H)-dione
    identifiers:
    - ns: cas
      id: 20298-86-6
    - ns: chebi
      id: CHEBI:15617
    - ns: mod
      id: MOD:00140
    - ns: pdb.ligand
      id: CYC
    - ns: go
      id: GO:0017009
    - ns: resid
      id: AA0131
    structure: O=C[C@H](CS[C@@H]([C@H]1/C(=C/C2=C(C)[C@@H](/C(=C/c3[nH]c(c(c3CCC(=O)[O-])C)/C=C/3\NC(=O)C(=C3C)CC)/[NH2+]2)CCC(=O)[O-])/NC(=O)[C@H]1C)C)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
  AA0570:
    id: AA0570
    name: L-arginine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-[(1S)-1-amino-4-([diaminomethylidene]amino)butyl]-1,3-thiazole-4-carboxylic
      acid
    identifiers:
    - ns: resid
      id: AA0570
    - ns: mod
      id: MOD:01899
    structure: OC(=O)c1csc(n1)[C@H](CCC[NH+]=C(N)N)[NH3+]
    base_monomers:
    - R
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
  AA0507:
    id: AA0507
    name: L-threonine methyl ester
    synonyms:
    - methyl (2S,3R)-2-amino-3-hydroxybutanoate
    - methyl L-threoninate
    identifiers:
    - ns: resid
      id: AA0507
    - ns: cas
      id: 3373-59-9
    - ns: go
      id: GO:0044608
    - ns: mod
      id: MOD:01610
    structure: COC(=O)[C@H]([C@H](O)C)N
    base_monomers:
    - T
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0241:
    id: AA0241
    name: glycine thiazole-4-carboxylic acid
    comments: 'Formed by the condensation of a cysteine thiol with the carbonyl of
      the preceding residue and alpha-beta dehydrogenation. Generating Enzyme: peptidyl-cysteine
      cyclase (EC 4.2.1.-); peptidyl-thiazoline dehydrogenase (EC 1.3.-.-).'
    synonyms:
    - 2-(azanylmethyl)-1,3-thiazole-4-carboxylic acid
    - 2-(aminomethyl)-1,3-thiazole-4-carboxylic acid
    identifiers:
    - ns: resid
      id: AA0241
    - ns: pdb.ligand
      id: BB9
    - ns: chebi
      id: CHEBI:21276
    - ns: cas
      id: 25438-22-6
    - ns: mod
      id: MOD:00246
    - ns: go
      id: GO:0018137
    structure: '[NH3+]Cc1scc(n1)C(=O)O'
    base_monomers:
    - C
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
  AA0492:
    id: AA0492
    name: 3,3-dihydroxy-L-alanine
    comments: 'This active site residue is formed by the spontaneous hydration of
      the aldehyde, 2-amino-3oxopropanoic acid. See RESID:AA0185. The PDB hetgroup
      FGL was originally designated as the "C(alpha)-formyl glycine" active site residue
      L-3-oxoalanine observed in its hydrated form. That structure, a gem-diol with
      an sp(3) carbon, was misinterpreted as a carboxyl with an sp(2) carbon, and
      assigned to aminomalonic acid (see RESID:AA0458) instead. The hetgroup DDZ is
      being introduced for 3,3-dihydroxyalanine. Generating Enzyme: sulfatase maturing
      enzyme (sulfatase modifying factor, C-alpha-formylglycine-generating enzyme)
      (EC 1.1.99.-) #link SER; sulfatase maturing enzyme (sulfatase modifying factor,
      C-alpha-formylglycine-generating enzyme) (EC 1.8.99.-) #link CYS.'
    synonyms:
    - (S)-2-amino-3,3-dihydroxypropanoic acid
    - 3,3-dihydroxy l-alanine
    - (2S)-2-amino-3,3-dihydroxy-propanoic acid
    - 2-(dihydroxymethyl)glycine
    - 3-hydroxy-L-serine
    - 3-oxoalanine hydrate
    - A
    - C(alpha)-formylglycine hydrate [misnomer]
    - 3,3-dihydroxyalanine
    identifiers:
    - ns: pdb.ligand
      id: DDZ
    - ns: mod
      id: MOD:01445
    - ns: mod
      id: MOD:01444
    - ns: resid
      id: AA0492
    - ns: pdb-ccd
      id: DDZ
    structure: OC([C@@H](C(=O)O)N)O
    base_monomers:
    - A
    - S
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0151:
    id: AA0151
    name: N4-(N-acetylamino)glucosyl-L-asparagine
    comments: 'This modification typically occurs in extracellar peptides with an
      NX[ST] motif. Partial modification has been observed to occur with cysteine,
      rather than serine or threonine, in the third position. Secondary structure
      features are important, and proline in the second or fourth positions inhibits
      modification. See also RESID:AA0420 and RESID:AA0421 for other N4-glycosylated
      asparagines. The PDB has some entries with asparagine apparently alpha-glycosylated
      with N-acetylglucosamine, those with PDBHET:NDG. These are low resolution structures
      and appear to be erroneous. Generating Enzyme: dolichyl-diphosphooligosaccharide-protein
      glycotransferase (EC 2.4.1.119); protein N-acetylglucosaminyltransferase (EC
      2.4.1.94).'
    synonyms:
    - N4-(N-acetylglucosaminyl)asparagine
    - N4-glycosylasparagine
    - N4-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-L-asparagine
    - N4-(2-acetylamino-2-deoxy-beta-D-glucopyranosyl)-L-asparagine
    - N4-glycosyl-L-asparagine
    - (2S)-2-amino-4-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)amino-4-oxobutanoic
      acid
    - N4-asparagine-beta-N-acetylglucosaminide
    identifiers:
    - ns: go
      id: GO:0006487
    - ns: mod
      id: MOD:00831
    - ns: chebi
      id: CHEBI:17261
    - ns: cas
      id: 10036-64-3
    - ns: pdb.ligand
      id: NAG
    - ns: resid
      id: AA0151
    structure: OC[C@H]1O[C@@H](NC(=O)C[C@@H](C(=O)O)N)[C@@H]([C@H]([C@@H]1O)O)NC(=O)C
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  AA0100:
    id: AA0100
    name: L-valine amide
    comments: 'Generating Enzyme: peptidylglycine monooxygenase (EC 1.14.17.3).'
    synonyms:
    - (2S)-2-amino-3-methylbutanamide
    - (2S)-2-amino-3-methyl-butanamide
    - valinamide
    - valinylamine
    - L-valinamide
    - X
    identifiers:
    - ns: mod
      id: MOD:00109
    - ns: pdb-ccd
      id: VLM
    - ns: chebi
      id: CHEBI:21418
    - ns: cas
      id: 4540-60-7
    - ns: go
      id: GO:0018053
    - ns: resid
      id: AA0100
    - ns: pdb.ligand
      id: NH2
    structure: '[NH3+][C@H](C(=O)N)C(C)C'
    base_monomers:
    - V
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0474:
    id: AA0474
    name: L-serine 5-methyloxazole-4-carboxylic acid
    comments: 'Formed by the condensation of a threonine hydroxyl with the carbonyl
      of the preceding residue and alpha-beta dehydrogenation. Generating Enzyme:
      peptidyl-threonine cyclase (EC 4.2.1.-); peptidyl-oxazoline dehydrogenase (EC
      1.3.-.-).'
    synonyms:
    - 2-[1-azanyl-2-hydroxyethyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    - 2-[(1S)-1-amino-2-hydroxyethyl]-5-methyl-1,3-oxazole-4-carboxylic acid
    identifiers:
    - ns: mod
      id: MOD:01397
    - ns: resid
      id: AA0474
    structure: OC[C@@H](c1oc(c(n1)C(=O)O)C)N
    base_monomers:
    - S
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
  AA0369:
    id: AA0369
    name: 3,4-dihydroxy-L-arginine
    comments: Hydroxylations at C-3 and C-4 are assumed. Neither the positions of
      the hydroxylations nor the stereochemistry for the chiral centers they produce
      have been determined. The (2S,3R,4R) stereoisomer is shown.
    synonyms:
    - beta,gamma-dihydroxyarginine
    - 2-amino-5-guanidino-3,4-dihydroxypentanoic acid
    - (2S,3Xi,4Xi)-2-amino-5-carbamimidamido-3,4-dihydroxypentanoic acid
    identifiers:
    - ns: resid
      id: AA0369
    - ns: mod
      id: MOD:00374
    - ns: go
      id: GO:0030961
    structure: O[C@@H]([C@@H]([C@@H](C(=O)O)N)O)C[NH+]=C(N)N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0562:
    id: AA0562
    name: L-cysteinyl L-phenylalanine sulfenamide
    comments: 'This cross-link is formed by the condensation of a cysteine residue
      sulfhydryl with the alpha-amido of the following residue. Generating Enzyme:
      autocatalytic.'
    synonyms:
    - 4-amino-3-isothiazolidinone-L-phenylalanine
    - phenylalanine-cysteine sulfenyl amide cross-link
    - 2-(4-amino-3-oxo-isothiazolidin-2-yl)-3-phenylpropanoic acid
    - phenylalanine-cysteine sulphenyl amide cross-link
    - cysteinyl phenylalanine sulfenamide
    - (2S)-2-[(4R)-4-amino-3-oxo-1,2-thiazolidin-2-yl]-3-phenylpropanoic acid
    identifiers:
    - ns: resid
      id: AA0562
    - ns: mod
      id: MOD:01859
    structure: '[NH3+][C@H]1CSN(C1=O)[C@H](C(=O)O)Cc1ccccc1'
    base_monomers:
    - F
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AA0267:
    id: AA0267
    name: O-(phospho-5'-adenosine)-L-threonine
    synonyms:
    - L-threonine monoanhydride with 5'-adenylic acid
    - 5'-adenylic-O3-L-threonine
    - O3-(phospho-5'-adenosine)-L-threonine
    - O(gamma)-5'-adenylic-L-threonine
    - beta-5'-adenylic-L-threonine
    - O3-L-threonine 5'-adenosine phosphodiester
    - (2S,3R)-2-amino-3-(5'-adenosine phosphonoxy)butanoic acid
    identifiers:
    - ns: resid
      id: AA0267
    - ns: mod
      id: MOD:00272
    - ns: go
      id: GO:0018178
    structure: OC(=O)[C@H]([C@H](OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])C)[NH3+]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 36
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 36
    - molecule: Monomer
      element: H
      position: 36
      charge: 1
  AA0340:
    id: AA0340
    name: 2-(S-L-cysteinyl)-L-phenylalanine
    comments: The L-stereoisomer of the 2-S-cysteinyl substituted phenylalanine has
      R configuration.
    synonyms:
    - alpha-(L-cystein-S-yl)-L-phenylalanine
    - (2R)-2-amino-2-[(2R)-2-amino-2-carboxyethyl]sulfanyl-3-phenylpropanoic acid
    - (2R,5R)-2,5-diamino-3-thia-2-phenylmethylhexanedioic acid
    identifiers:
    - ns: go
      id: GO:0046924
    - ns: resid
      id: AA0340
    - ns: mod
      id: MOD:00345
    structure: O=C[C@@](Cc1ccccc1)(SC[C@@H](C(=O)O)[NH3+])N
    base_monomers:
    - F
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  AA0569:
    id: AA0569
    name: N,N-dimethyl-L-arginine
    comments: This modification should not be confused with omega-N,omega-N'-dimethyl-L-arginine
      (see RESID:AA0067) or omega-N,omega-N-dimethyl-L-arginine (see RESID:AA0068).
    synonyms:
    - N(alpha),N(alpha)-dimethylarginine
    - (2S)-5-carbamimidamido-2-(dimethylamino)pentanoic acid [tautomer]
    - (2S)-5-[(diaminomethylidene)amino]-2-(dimethylamino)pentanoic acid
    - N2,N2-dimethylarginine
    identifiers:
    - ns: mod
      id: MOD:01898
    - ns: cas
      id: 190784-00-0
    - ns: resid
      id: AA0569
    structure: C[NH+]([C@H](C(=O)O)CCC[NH+]=C(N)N)C
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
    - molecule: Monomer
      element: H
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  AA0107:
    id: AA0107
    name: S-diacylglycerol-L-cysteine
    comments: The oleate and palmitate actually represent mixtures of saturated (generally
      at 3') and unsaturated (generally at 2') fatty acids. The signal peptide that
      is cleaved immediately before the modified cysteine typically ends in the motif
      [ILMV]X[AGS]C. Cleavage and formation of this modification may occur without
      N-palmitoylation, see RESID:AA0060.
    synonyms:
    - S-(1-2'-oleoyl-3'-palmitoyl-glycerol)cysteine
    - (2R)-2-amino-3-[(2S)-2-((9Z)-9-octadecenoyloxy)-3-(hexadecanoyloxy)propyl]sulfanylpropanoic
      acid
    - 2-amino-3-[(S)-2-((Z)-9-octadecenoyloxy)-3-(hexadecanoyloxy)propyl]thiopropanoic
      acid
    identifiers:
    - ns: go
      id: GO:0018231
    - ns: pdb.ligand
      id: DGA
    - ns: mod
      id: MOD:00116
    - ns: resid
      id: AA0107
    structure: CCCCCCCCCCCCCCCC(=O)OC[C@H](OC(=O)CCCCCCC/C=C\CCCCCCCC)CSC[C@@H](C(=O)O)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 47
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 50
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 49
    - molecule: Monomer
      element: H
      position: 49
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 50
    - molecule: Monomer
      element: H
      position: 50
      charge: 1
  AA0073:
    id: AA0073
    name: 3'-methyl-L-histidine
    comments: 'In the older biochemical literature this is usually called 1-methylhistidine.
      See also RESID:AA0317. The crystallographic designation for the substituted
      nitrogen is delta-1, D1. Generating Enzyme: protein-histidine N(pi)-methyltransferase
      (EC 2.1.1.-).'
    synonyms:
    - 1-methylhistidine [misnomer]
    - H
    - n1-methylated histidine
    - N(delta)-methylhistidine
    - (2S)-2-amino-3-(3-methyl-3H-imidazol-4-yl)propanoic acid
    - pros-methylhistidine
    - N(pi)-methylhistidine
    - (2S)-2-amino-3-(3-methylimidazol-4-yl)propanoic acid
    - 3-methyl-L-histidine
    identifiers:
    - ns: cas
      id: 368-16-1
    - ns: pdb-ccd
      id: MHS
    - ns: mod
      id: MOD:00082
    - ns: go
      id: GO:0018021
    - ns: resid
      id: AA0073
    - ns: chebi
      id: CHEBI:43903
    - ns: pdb.ligand
      id: MHS
    structure: Cn1cncc1C[C@H]([NH3+])C(=O)O
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA0029:
    id: AA0029
    name: 3-hydroxy-L-proline
    comments: 'There are at least three different genes for procollagen-proline 3-dioxygenase
      in mammals with different specificities and patterns of tissue expression. Usually
      proline 3-hydroxylation occurs at the second position of specific GPP sequences
      in collagen chains and is preceded by proline 4-hydroxylation of the proline
      in the third position. See RESID:AA0030. Generating Enzyme: procollagen-proline
      3-dioxygenase (EC 1.14.11.7).'
    synonyms:
    - 3-trans-hydroxy-L-proline
    - (3S)-3-hydroxy-L-proline
    - L-threo-3-hydroxyproline
    - beta-hydroxypyrrolidine-alpha-carboxylic acid
    - P
    - 3-hydroxyproline
    - (2S,3S)-3-hydroxypyrrolidine-2-carboxylic acid
    identifiers:
    - ns: cas
      id: 4298-08-2
    - ns: chebi
      id: CHEBI:16889
    - ns: resid
      id: AA0029
    - ns: go
      id: GO:0018400
    - ns: pdb-ccd
      id: HY3
    - ns: pdb.ligand
      id: HY3
    - ns: mod
      id: MOD:00038
    structure: O[C@H]1CC[NH2+][C@@H]1C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA0513:
    id: AA0513
    name: trithiocystine
    synonyms:
    - (2R,2'R)-3,3'-pentasulfane-1,5-diylbis(2-aminopropanoic acid)
    - bis(2-amino-2-carboxyethyl)pentasulfide
    - 3,3'-pentathiobisalanine
    identifiers:
    - ns: pdb.ligand
      id: S3H
    - ns: mod
      id: MOD:01616
    - ns: resid
      id: AA0513
    structure: O=C[C@H](CSSSSSC[C@@H](C(=O)O)[NH3+])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  AA0070:
    id: AA0070
    name: N4-methyl-L-asparagine
    synonyms:
    - N(gamma)-methylasparagine
    - N-methyl-L-asparagine
    - N-methylasparagine
    - N
    - (2S)-2-amino-N4-methylbutanediamic acid
    - (2S)-2-amino-4-methylamino-4-oxo-butanoic acid
    - beta-methylasparagine [misnomer]
    - n-methyl asparagine
    - beta-aspartyl methylamide
    identifiers:
    - ns: pdb.ligand
      id: MEN
    - ns: resid
      id: AA0070
    - ns: cas
      id: 7175-34-0
    - ns: pdb-ccd
      id: MEN
    - ns: chebi
      id: CHEBI:61960
    - ns: mod
      id: MOD:00079
    - ns: go
      id: GO:0019710
    structure: CNC(=O)C[C@@H](C(=O)O)N
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AA0043:
    id: AA0043
    name: N-acetyl-L-cysteine
    comments: See also RESID:AA0044.
    synonyms:
    - 2-acetylamino-3-sulfanylpropanoic acid
    - 2-acetylamino-3-mercaptopropanoic acid
    - N-acetylcysteine
    - 2-acetylazanyl-3-sulfanylpropanoic acid
    - (2R)-2-acetamido-3-sulfanylpropanoic acid
    identifiers:
    - ns: resid
      id: AA0043
    - ns: chebi
      id: CHEBI:28939
    - ns: go
      id: GO:0018275
    - ns: mod
      id: MOD:00052
    - ns: cas
      id: 616-91-1
    structure: SC[C@@H](C(=O)O)NC(=O)C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  AA0183:
    id: AA0183
    name: (Z)-2,3-didehydrotyrosine
    synonyms:
    - cis-dehydrotyrosine
    - green fluorescent protein chromophore
    - '{(4z)-2-[(1s)-1-amino-3-(methylsulfanyl)propyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    - MYG
    - 2-[(4Z)-2-[(1S)-1-amino-3-methylsulfanyl-propyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - para-hydroxybenzylidene-imidazolidinone chromophore
    - '{(4Z)-2-[(1S)-1-amino-3-(methylsulfanyl)propyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - red fluorescent protein chromophore
    - (2Z)-2-amino-3-(4-hydroxyphenyl)prop-2-enoic acid
    - amino-(para-hydroxybenzylidenyl)acetic acid
    identifiers:
    - ns: mod
      id: MOD:00191
    - ns: pdb-ccd
      id: CH6
    - ns: resid
      id: AA0183
    - ns: pdb.ligand
      id: CH6
    - ns: go
      id: GO:0018251
    structure: Oc1ccc(cc1)/C=C(/C(=O)O)\N
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  AA0339:
    id: AA0339
    name: N-palmitoyl-glycine
    comments: 'This modification should not be confused with N-myristoyl-glycine (see
      RESID:AA0059). Generating Enzyme: glycylpeptide N-palmitoyltransferase (EC 2.3.1.-).'
    synonyms:
    - (hexadecanamido)acetic acid
    - N-(1-oxohexadecyl)glycine
    - (hexadecanoylamino)acetic acid
    - (hexadecanoylamino)ethanoic acid
    identifiers:
    - ns: pdb.ligand
      id: '140'
    - ns: cas
      id: 2441-41-0
    - ns: go
      id: GO:0046918
    - ns: mod
      id: MOD:00344
    - ns: resid
      id: AA0339
    structure: CCCCCCCCCCCCCCCC(=O)NCC(=O)O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
  AA0547:
    id: AA0547
    name: (E)-dehydrobutyrine
    comments: 'In some cases it has not been firmly established whether the natural
      form is the Z or the E isomer. For the Z isomer, see RESID:AA0182. A 2,3-didehydro
      amino acid blocks Edman degradation. Generating Enzyme: protein-threonine dehydratase
      (EC 4.2.1.-).'
    synonyms:
    - 2,3-didehydrobutyrine
    - (E)-2-amino-2-butenoic acid
    - 3-methyldehydroalanine
    - anhydrothreonine
    - (2E)-2-aminobut-2-enoic acid
    - Dhb
    - (E)-2-aminobutenoic acid
    - methyl-dehydroalanine
    - alpha,beta-dehydroaminobutyric acid
    identifiers:
    - ns: resid
      id: AA0547
    - ns: mod
      id: MOD:00190
    structure: C/C=C(\C(=O)O)/N
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  AA0587:
    id: AA0587
    name: Desmosine
    comments: 'After the oxidation of three of the four lysines to allysine (see RESID:AA0121),
      this cross-link forms spontaneously with a Schiff-base reaction, and a series
      of one aldimine and two aldol condensation reactions. In this aleatoric modification
      up to four peptide chains may be crosslinked, with each peptide contributing
      a lysine potentially in any of the four biosynthetic positions. Isodesmosine
      is a structural isomer (see RESID:AA0588). Up to two of the lysines forming
      the cross-link may also be hydroxylated and glycosylated (see RESID:AA0028 and
      RESID:AA0153). Generating Enzyme: lysyl oxidase (EC 1.4.3.13).'
    synonyms:
    - 6-[4-(4-amino-4-carboxybutyl)-3,5-bis(3-amino-3-carboxypropyl)pyridinio]norleucine
    - 4-[(4S)-4-amino-4-carboxybutyl]-1-[(5S)-5-amino-5-carboxypentyl]-3,5-bis[(3S)-3-amino-3-carboxypropyl]pyridinium
    identifiers:
    - ns: chebi
      id: CHEBI:37629
    - ns: mod
      id: MOD:01933
    - ns: cas
      id: 11003-57-9
    - ns: resid
      id: AA0587
    structure: O=C[C@H](CCC1=C[NH+](CCCC[C@@H](C(=O)O)[NH3+])C=C([C@H]1CCC[C@@H](C=O)[NH3+])CC[C@@H](C=O)[NH3+])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  AA0419:
    id: AA0419
    name: N-methyl-L-proline
    comments: 'Generating Enzyme: N-terminal RCC1 methyltransferase (EC 2.1.1.-).'
    synonyms:
    - 1-methylpyrrolidine-2-carboxylic acid
    - (S)-1-methylpyrrolidine-2-carboxylic acid
    - hygric acid
    identifiers:
    - ns: resid
      id: AA0419
    - ns: cas
      id: 475-11-6
    - ns: mod
      id: MOD:00830
    - ns: go
      id: GO:0035568
    structure: C[NH+]1CCC[C@H]1C(=O)O
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
    - molecule: Monomer
      element: H
      position: 11
  AA0473:
    id: AA0473
    name: 5-hydroxy-3-methyl-L-proline
    comments: The stereochemistry at C3 and C5 has not been resolved, but (3S) can
      be assumed by derivation from L-isoleucine. The (3S,5S) form is shown.
    synonyms:
    - beta-methyl-delta-hydroxyproline
    - (2S,3S,5Xi)-5-hydroxy-3-methylpyrrolidine-2-carboxylic acid
    - 5-hydroxy-3-methylproline
    identifiers:
    - ns: resid
      id: AA0473
    - ns: mod
      id: MOD:01897
    structure: C[C@H]1C[C@@H]([NH2+][C@@H]1C(=O)O)O
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
    - molecule: Monomer
      element: H
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  AA0143:
    id: AA0143
    name: S-(8alpha-FAD)-L-cysteine
    comments: 'The arrangement of the attachment has not been completely established
      in some cases. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin. Generating Enzyme: autocatalytic.'
    synonyms:
    - (2R)-2-amino-3-[8alpha-riboflavin 5'-(trihydrogen diphosphate) 5'->5'-ester
      with adenosine]sulfanylpropanoic acid
    - 8alpha-(S-cysteinyl)FAD
    identifiers:
    - ns: resid
      id: AA0143
    - ns: pdb.ligand
      id: FAD
    - ns: go
      id: GO:0018294
    - ns: mod
      id: MOD:00152
    structure: O=C1[N-]C(=O)C2C(N1)N(C[C@@H]([C@@H]([C@@H](CO[P@@](=O)(O[P@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc3c1ncnc3N)[O-])[O-])O)O)O)C1C(N2)CC(C(C1)CSC[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 64
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 67
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 66
    - molecule: Monomer
      element: H
      position: 66
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 67
    - molecule: Monomer
      element: H
      position: 67
      charge: 1
  AA0564:
    id: AA0564
    name: N6-(4-aminobutyl)-L-lysine
    comments: 'Deoxyhypusine is generated as an intermediate modification of initiation
      factor 5A, eIF5A, and as a modified lysine reaction intermediate in deoxyhypusine
      synthase before transfer of the 4-aminobutyl group. Generating Enzyme: autocatalytic;
      deoxyhypusine synthase (EC 2.5.1.46).'
    synonyms:
    - N6-(4-aminobutyl)lysine
    - (2S)-2-amino-6-[(4-aminobutyl)amino]hexanoic acid
    - deoxyhypusine
    - (2S)-2-azanyl-6-(4-azanylbutylamino)hexanoic acid
    - K
    - N~6~-(4-aminobutyl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 5GG
    - ns: go
      id: GO:0034038
    - ns: cas
      id: 82543-85-9
    - ns: chebi
      id: CHEBI:50038
    - ns: resid
      id: AA0564
    - ns: mod
      id: MOD:01880
    structure: '[NH3+]CCCC[NH2+]CCCC[C@@H](C(=O)O)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  AA0101:
    id: AA0101
    name: L-cysteine methyl disulfide
    synonyms:
    - s-methyl-thio-cysteine
    - (2R)-2-amino-3-(methyldisulfanediyl)propanoic acid
    - 2-azanyl-3-(methyldisulfanediyl)-propanoic acid
    - L-3-(methyldithio)alanine
    - 2-amino-3-(methyldisulfanediyl)propanoic acid
    - S-methylthio-L-cysteine
    - S-methylthiocysteine
    - C
    - (2R)-2-azanyl-3-methyldisulfanyl-propanoic acid
    - 2-amino-3-(methyldithio)propanoic acid
    - 3-(methyldisulfanyl)-L-alanine
    - 2-amino-3-methyldisulfanylpropanoic acid
    identifiers:
    - ns: go
      id: GO:0018222
    - ns: pdb-ccd
      id: SCH
    - ns: mod
      id: MOD:00110
    - ns: resid
      id: AA0101
    - ns: pdb.ligand
      id: SCH
    - ns: cas
      id: 33784-54-2
    structure: CSSC[C@H]([NH3+])C(=O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
    - molecule: Monomer
      element: H
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  AA0353:
    id: AA0353
    name: 3'-(8alpha-FMN)-L-histidine
    comments: In a later publication the authors changed the enzyme activity, the
      connection from a histidine nitrogen to a cysteine sulfur, and the identity
      of the flavin from FMN to FAD. They now believe the modification is S-(8alpha-FAD)-L-cysteine,
      see RESID:AA0143. The keyword "phosphoprotein" is not used with flavin modifications
      linked through the flavin.
    synonyms:
    - (S)-2-amino-3-(3-[8alpha riboflavin 5'-dihydrogen phosphate]imidazol-4-yl)propanoic
      acid
    - pros-(8alpha-FMN)-histidine
    - 8alpha-(N3'-histidyl)FMN
    - N(pi)-(8alpha-FMN)-histidine
    - 8alpha-(N(delta)-histidyl)FMN
    identifiers:
    - ns: mod
      id: MOD:00358
    - ns: go
      id: GO:0050744
    - ns: resid
      id: AA0353
    structure: O=C1[N-]C(=O)C2C(N1)N(C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)C1C(N2)CC(C(C1)Cn1cncc1C[C@@H](C(=O)O)[NH3+])C
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 42
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 45
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 44
    - molecule: Monomer
      element: H
      position: 44
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 45
    - molecule: Monomer
      element: H
      position: 45
      charge: 1
  AA0291:
    id: AA0291
    name: O-D-glucuronosyl-L-serine
    comments: 'The beta glucuronosyl form is shown. See also RESID:AA0154, RESID:AA0208,
      RESID:AA0209, RESID:AA0210, RESID:AA0296, RESID:AA0297, RESID:AA0397, RESID:AA0398,
      RESID:AA0400, RESID:AA0402, RESID:AA0404, RESID:AA0406, and RESID:AA0422 for
      other O-glycosylated serines. Generating Enzyme: UDP-glucuronate beta-D-glucuronosyltransferase
      (acceptor-unspecific) (EC 2.4.1.17).'
    synonyms:
    - O3-D-glucuronosyl-L-serine
    - (2S)-2-amino-3-(beta-D-glucopyranuronosyl)propanoic acid
    identifiers:
    - ns: resid
      id: AA0291
    - ns: cas
      id: 528-16-5
    - ns: go
      id: GO:0018413
    - ns: mod
      id: MOD:00296
    structure: O=C[C@H](CO[C@H]1O[C@H](C(=O)[O-])[C@H]([C@@H]([C@H]1O)O)O)[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  '004':
    id: '004'
    name: (2s)-amino(phenyl)ethanoic acid
    synonyms:
    - (2S)-amino(phenyl)ethanoic acid
    - (2S)-2-azanyl-2-phenyl-ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: '004'
    structure: '[NH3+][C@@H](c1ccccc1)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  00B:
    id: 00B
    name: (4r)-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid
    synonyms:
    - (4R)-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 00B
    structure: '[O-]C(=O)[C@H]1[NH2+]CSC1(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  01W:
    id: 01W
    name: (2s)-2-ammonio-4-[(2,4-dinitrophenyl)amino]butanoate
    synonyms:
    - (2S)-2-ammonio-4-[(2,4-dinitrophenyl)amino]butanoate
    - (2S)-2-azaniumyl-4-[(2,4-dinitrophenyl)amino]butanoate
    - X
    identifiers:
    - ns: pdb-ccd
      id: 01W
    structure: '[O-]C(=O)[C@H](CCNc1ccc(cc1[N+](=O)[O-])[N+](=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  02A:
    id: 02A
    name: (2s)-azetidine-2-carboxylic acid
    synonyms:
    - (2S)-azetidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 02A
    structure: '[O-]C(=O)[C@@H]1CC[NH2+]1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  02L:
    id: 02L
    name: n-(2,2-dimethylpropyl)-l-asparagine
    synonyms:
    - N
    - N-(2,2-dimethylpropyl)-L-asparagine
    - (2S)-2-azanyl-4-(2,2-dimethylpropylamino)-4-oxidanylidene-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 02L
    structure: '[NH3+][C@H](C(=O)[O-])CC(=O)NCC(C)(C)C'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  02O:
    id: 02O
    name: 3-(3-tert-butyl-1,2,4-oxadiazol-5-yl)-l-alanine
    synonyms:
    - 3-(3-tert-butyl-1,2,4-oxadiazol-5-yl)-L-alanine
    - (2S)-2-azanyl-3-(3-tert-butyl-1,2,4-oxadiazol-5-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 02O
    structure: '[NH3+][C@H](C(=O)[O-])Cc1onc(n1)C(C)(C)C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  02V:
    id: 02V
    name: (2s)-(3,4-dihydroxyphenyl)(methylamino)ethanoic acid
    synonyms:
    - (2S)-2-[3,4-bis(oxidanyl)phenyl]-2-(methylamino)ethanoic acid
    - (2S)-(3,4-dihydroxyphenyl)(methylamino)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 02V
    structure: C[NH2+][C@@H](c1ccc(c(c1)O)O)C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  02Y:
    id: 02Y
    name: 6-diazonio-5-oxo-l-norleucine
    synonyms:
    - 6-diazonio-5-oxo-L-norleucine
    - (5S)-5-azanyl-6-oxidanyl-2,6-bis(oxidanylidene)hexane-1-diazonium
    identifiers:
    - ns: pdb-ccd
      id: 02Y
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC(=O)C[N+]#N'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  '037':
    id: '037'
    name: (1s,3ar,6as)-octahydrocyclopenta[c]pyrrole-1-carboxylic acid
    synonyms:
    - (1S,3aR,6aS)-octahydrocyclopenta[c]pyrrole-1-carboxylic acid
    - (3S,3aS,6aR)-1,2,3,3a,4,5,6,6a-octahydrocyclopenta[c]pyrrole-3-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: '037'
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@H]2[C@@H]1CCC2'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  03Y:
    id: 03Y
    name: 2-methyl-l-cysteine
    synonyms:
    - 2-methyl-L-cysteine
    - C
    - (2R)-2-azanyl-2-methyl-3-sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 03Y
    structure: '[O-]C(=O)[C@@]([NH3+])(CS)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  04U:
    id: 04U
    name: azanylidene-[(3s,5s)-5-carboxypyrrolidin-3-yl]imino-azanium
    synonyms:
    - (4S)-4-triaza-1,2-dien-2-ium-1-yl-L-proline
    - P
    - azanylidene-[(3S,5S)-5-carboxypyrrolidin-3-yl]imino-azanium
    identifiers:
    - ns: pdb-ccd
      id: 04U
    structure: '[N-]=[N+]=N[C@@H]1C[NH2+][C@@H](C1)C(=O)[O-]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  04V:
    id: 04V
    name: (2s)-pyrrolidine-2-carboximidic acid
    synonyms:
    - P
    - (2S)-pyrrolidine-2-carboximidic acid
    identifiers:
    - ns: pdb-ccd
      id: 04V
    structure: '[O-]C(=[NH2+])[C@@H]1CCC[NH2+]1'
    base_monomers:
    - P
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  04X:
    id: 04X
    name: (2s)-5-(morpholin-4-ylmethyl)-1,2,3,6-tetrahydropyridine-2-carboxylic acid
    synonyms:
    - (2S)-5-(morpholin-4-ylmethyl)-1,2,3,6-tetrahydropyridine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 04X
    structure: '[O-]C(=O)[C@H]1[NH2+]CC(=CC1)CN1CCOCC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  05N:
    id: 05N
    name: (3r,4r)-4-hydroxy-3-methyl-l-proline
    synonyms:
    - P
    - (2S,3R,4R)-3-methyl-4-oxidanyl-pyrrolidine-2-carboxylic acid
    - (3R,4R)-4-hydroxy-3-methyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 05N
    structure: O[C@H]1C[NH2+][C@@H]([C@H]1C)C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  07O:
    id: 07O
    name: s-[(2s)-2-phenylpropanoyl]-l-cysteine
    synonyms:
    - S-[(2S)-2-phenylpropanoyl]-L-cysteine
    - (2R)-2-azanyl-3-[(2S)-2-phenylpropanoyl]sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 07O
    structure: C[C@@H](c1ccccc1)C(=O)SC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  08M:
    id: 08M
    name: n~5~-(pyrazin-2-ylcarbonyl)-l-ornithine
    synonyms:
    - (2S)-2-azanyl-5-(pyrazin-2-ylcarbonylamino)pentanoic acid
    - N~5~-(pyrazin-2-ylcarbonyl)-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: 08M
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCNC(=O)c1cnccn1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0A0:
    id: 0A0
    name: 2-methyl-l-aspartic acid
    synonyms:
    - 2-methyl-L-aspartic acid
    - D
    - (2S)-2-amino-2-methyl-butanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: 0A0
    structure: '[O-]C(=O)C[C@@](C(=O)[O-])([NH3+])C'
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  0A1:
    id: 0A1
    name: o-methyl-l-tyrosine
    synonyms:
    - O-methyl-L-tyrosine
    - (2S)-2-amino-3-(4-methoxyphenyl)propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: 0A1
    structure: COc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  0A2:
    id: 0A2
    name: '[(1r)-1,5-diaminopentyl][bis(ethanolato)]hydroxyborate(1-)'
    synonyms:
    - K
    - '[(1R)-1,5-diaminopentyl]-diethoxy-hydroxy-boron'
    - '[(1R)-1,5-diaminopentyl][bis(ethanolato)]hydroxyborate(1-)'
    identifiers:
    - ns: pdb-ccd
      id: 0A2
    structure: CCO[B-]([C@H](CCCC[NH3+])[NH3+])(OCC)O
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  0A8:
    id: 0A8
    name: s-[(2-chloroethyl)carbamoyl]-l-cysteine
    synonyms:
    - (2R)-2-amino-3-(2-chloroethylcarbamoylsulfanyl)propanoic acid
    - S-[(2-chloroethyl)carbamoyl]-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: 0A8
    structure: '[O-]C(=O)[C@@H]([NH3+])CSC(=O)NCCCl'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0A9:
    id: 0A9
    name: methyl l-phenylalaninate
    synonyms:
    - methyl L-phenylalaninate
    - methyl (2S)-2-azanyl-3-phenyl-propanoate
    identifiers:
    - ns: pdb-ccd
      id: 0A9
    structure: COC(=O)[C@H](Cc1ccccc1)N
    base_monomers:
    - F
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  0AB:
    id: 0AB
    name: (3s,4s)-3-amino-4-methyl-3,4-dihydro-2h-pyran-2-one
    synonyms:
    - V
    - (3S,4S)-3-amino-4-methyl-3,4-dihydropyran-2-one
    - (3S,4S)-3-amino-4-methyl-3,4-dihydro-2H-pyran-2-one
    identifiers:
    - ns: pdb-ccd
      id: 0AB
    structure: O=C1OC=C[C@@H]([C@@H]1[NH3+])C
    base_monomers:
    - V
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  0AH:
    id: 0AH
    name: o-(bromoacetyl)-l-serine
    synonyms:
    - O-(bromoacetyl)-L-serine
    - S
    - (2S)-2-amino-3-(2-bromoethanoyloxy)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0AH
    structure: '[O-]C(=O)[C@@H]([NH3+])COC(=O)CBr'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0AK:
    id: 0AK
    name: (2s)-2-amino-4-(2-chloroethoxy)-4-oxobutanoic acid
    synonyms:
    - D
    - (2S)-2-amino-4-(2-chloroethoxy)-4-oxo-butanoic acid
    - (2S)-2-amino-4-(2-chloroethoxy)-4-oxobutanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: 0AK
    structure: '[O-]C(=O)[C@@H]([NH3+])CC(=O)OCCCl'
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0AR:
    id: 0AR
    name: n-[n-[(4s)-4-azanyl-5-hydroxy-5-oxo-pentyl]carbamimidoyl]ethanamide
    synonyms:
    - N~5~-(N-acetylcarbamimidoyl)-L-ornithine
    - (2S)-2-azanyl-5-[(N-ethanoylcarbamimidoyl)amino]pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: 0AR
    structure: CC(=O)NC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  0BN:
    id: 0BN
    name: 4-carbamimidoyl-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-azanyl-3-(4-carbamimidoylphenyl)propanoic acid
    - 4-carbamimidoyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 0BN
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)C(=[NH2+])N)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  0CS:
    id: 0CS
    name: 3-[(s)-hydroperoxysulfinyl]-l-alanine
    synonyms:
    - A
    - (2R)-2-amino-3-[(S)-hydroperoxysulfinyl]propanoic acid
    - 3-[(S)-hydroperoxysulfinyl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 0CS
    structure: '[O-]C(=O)[C@@H]([NH3+])C[S@@](=O)OO'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  '0E5':
    id: '0E5'
    name: (2s,3r)-2-azanyl-3-methyl-3-oxidanyl-pentanoic acid
    synonyms:
    - (2S,3R)-2-azanyl-3-methyl-3-oxidanyl-pentanoic acid
    - T
    - (2S,3S)-2-amino-3-hydroxy-3-methylpentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: '0E5'
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@@](CC)(O)C'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0EA:
    id: 0EA
    name: (betar)-beta,3-dihydroxy-n-methyl-l-tyrosine
    synonyms:
    - (betaR)-beta,3-dihydroxy-N-methyl-L-tyrosine
    - (2S,3R)-3-[3,4-bis(oxidanyl)phenyl]-2-(methylamino)-3-oxidanyl-propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: 0EA
    structure: C[NH2+][C@@H]([C@@H](c1ccc(c(c1)O)O)O)C(=O)[O-]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  0FL:
    id: 0FL
    name: 3-amino-n-formyl-l-alanine
    synonyms:
    - A
    - 3-amino-N-formyl-L-alanine
    - (2S)-3-azanyl-2-formamido-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0FL
    structure: O=CN[C@H](C(=O)[O-])C[NH3+]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  0G5:
    id: 0G5
    name: n~5~-(3-iodobenzoyl)-l-ornithine
    synonyms:
    - (2S)-2-azanyl-5-[(3-iodanylphenyl)carbonylamino]pentanoic acid
    - N~5~-(3-iodobenzoyl)-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: 0G5
    structure: '[O-]C(=O)[C@H](CCCNC(=O)c1cccc(c1)I)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  0LF:
    id: 0LF
    name: (4r)-4-(4-phenylbutoxy)-l-proline
    synonyms:
    - (4R)-4-(4-phenylbutoxy)-L-proline
    - (2S,4R)-4-(4-phenylbutoxy)pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 0LF
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@@H](C1)OCCCCc1ccccc1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0NC:
    id: 0NC
    name: n-methyl-l-alaninamide
    synonyms:
    - A
    - (2S)-2-amino-N-methyl-propanamide
    - N-methyl-L-alaninamide
    identifiers:
    - ns: pdb-ccd
      id: 0NC
    structure: CNC(=O)[C@@H]([NH3+])C
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
  0PR:
    id: 0PR
    name: n-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methyl)-l-tyrosine
    synonyms:
    - (2S)-2-[[3-hydroxy-2-methyl-5-(phosphonooxymethyl)pyridin-4-yl]methylamino]-3-(4-hydroxyphenyl)propanoic
      acid
    - Y
    - N-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methyl)-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: 0PR
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)O)[NH2+]Cc1c(cnc(c1O)C)COP(=O)([O-])[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  0QL:
    id: 0QL
    name: 3-[(2-aminoethyl)disulfanyl]-l-alanine
    synonyms:
    - 3-[(2-aminoethyl)disulfanyl]-L-alanine
    - (2R)-2-azanyl-3-(2-azanylethyldisulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0QL
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSCC[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0RJ:
    id: 0RJ
    name: 3-(formylamino)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-formamido-propanoic acid
    - 3-(formylamino)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 0RJ
    structure: O=CNC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  0TD:
    id: 0TD
    name: (3s)-3-(methylsulfanyl)-l-aspartic acid
    synonyms:
    - (3S)-3-(methylsulfanyl)-L-aspartic acid
    - (2R,3S)-2-azanyl-3-methylsulfanyl-butanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: 0TD
    structure: CS[C@@H]([C@@H](C(=O)[O-])[NH3+])C(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  0W6:
    id: 0W6
    name: (4s)-4-aminopentanoic acid
    synonyms:
    - (4S)-4-azanylpentanoic acid
    - (4S)-4-aminopentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0W6
    structure: '[O-]C(=O)CC[C@@H]([NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  0WZ:
    id: 0WZ
    name: 3-(1h-pyrazol-1-yl)-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-(4-oxidanyl-3-pyrazol-1-yl-phenyl)propanoic acid
    - Y
    - 3-(1H-pyrazol-1-yl)-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: 0WZ
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)n1cccn1)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  0X9:
    id: 0X9
    name: n~2~-sulfamoyl-l-arginine
    synonyms:
    - N~2~-sulfamoyl-L-arginine
    - (2S)-5-carbamimidamido-2-(sulfamoylamino)pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0X9
    structure: '[O-]C(=O)[C@@H](NS(=O)(=O)N)CCCNC(=[NH2+])N'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  0Y8:
    id: 0Y8
    name: (4r)-4-[(7-bromoisoquinolin-1-yl)oxy]-l-proline
    synonyms:
    - P
    - (4R)-4-[(7-bromoisoquinolin-1-yl)oxy]-L-proline
    - (2S,4R)-4-(7-bromanylisoquinolin-1-yl)oxypyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 0Y8
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@@H](C1)Oc1nccc2c1cc(Br)cc2'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  0YG:
    id: 0YG
    name: n-[(2z)-2-amino-3-(4-hydroxyphenyl)prop-2-enoyl]glycine
    synonyms:
    - YG
    - 2-[[(Z)-2-azanyl-3-(4-hydroxyphenyl)prop-2-enoyl]amino]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 0YG
    structure: N/C(=C\c1ccc(cc1)O)/C(=O)NCC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  11Q:
    id: 11Q
    name: 1-(cyclohexylmethyl)-l-proline
    synonyms:
    - 1-(cyclohexylmethyl)-L-proline
    - (2S)-1-(cyclohexylmethyl)pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 11Q
    structure: '[O-]C(=O)[C@@H]1CCC[NH+]1CC1CCCCC1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  11W:
    id: 11W
    name: (4r)-4-[(2e)-3-{4-[(e)-phenyldiazenyl]phenyl}prop-2-en-1-yl]-l-glutamic
      acid
    synonyms:
    - (2S,4R)-2-azanyl-4-[(E)-3-[4-[(E)-phenyldiazenyl]phenyl]prop-2-enyl]pentanedioic
      acid
    - (4R)-4-[(2E)-3-{4-[(E)-phenyldiazenyl]phenyl}prop-2-en-1-yl]-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: 11W
    structure: '[NH3+][C@H](C(=O)[O-])C[C@H](C(=O)[O-])C/C=C/c1ccc(cc1)/N=N/c1ccccc1'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  12L:
    id: 12L
    name: (1r,2s,5s)-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylic acid
    synonyms:
    - (1R,2S,5S)-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylic acid
    - (1S,4S,5R)-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-4-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 12L
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@H]2[C@@H]1C2(C)C'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  12X:
    id: 12X
    name: (4r)-4-[(8-bromo-7-methoxy-2-{2-[(2-methylpropanoyl)amino]-1,3-thiazol-4-yl}quinolin-4-yl)oxy]-l-proline
    synonyms:
    - (4R)-4-[(8-bromo-7-methoxy-2-{2-[(2-methylpropanoyl)amino]-1,3-thiazol-4-yl}quinolin-4-yl)oxy]-L-proline
    - (2S,4R)-4-[8-bromanyl-7-methoxy-2-[2-(2-methylpropanoylamino)-1,3-thiazol-4-yl]quinolin-4-yl]oxypyrrolidine-2-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 12X
    structure: COc1ccc2c(c1Br)nc(cc2O[C@H]1C[NH2+][C@@H](C1)C(=O)[O-])c1csc(n1)NC(=O)C(C)C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  12Y:
    id: 12Y
    name: (4r)-4-[(7-methoxy-2-{2-[(2-methylpropanoyl)amino]-1,3-thiazol-4-yl}quinolin-4-yl)oxy]-l-proline
    synonyms:
    - (2S,4R)-4-[7-methoxy-2-[2-(2-methylpropanoylamino)-1,3-thiazol-4-yl]quinolin-4-yl]oxypyrrolidine-2-carboxylic
      acid
    - (4R)-4-[(7-methoxy-2-{2-[(2-methylpropanoyl)amino]-1,3-thiazol-4-yl}quinolin-4-yl)oxy]-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 12Y
    structure: COc1ccc2c(c1)nc(cc2O[C@H]1C[NH2+][C@@H](C1)C(=O)[O-])c1csc(n1)NC(=O)C(C)C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  13E:
    id: 13E
    name: n-[(2s)-2-amino-3-phenylpropyl]-l-methionine
    synonyms:
    - N-[(2S)-2-amino-3-phenylpropyl]-L-methionine
    - (2S)-2-[[(2S)-2-azanyl-3-phenyl-propyl]amino]-4-methylsulfanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 13E
    structure: CSCC[C@@H](C(=O)[O-])[NH2+]C[C@H](Cc1ccccc1)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  '143':
    id: '143'
    name: s-2,3-dihydro-5-glycin-2-yl-isoxazol-3-yl-cysteine
    synonyms:
    - (2R)-2-amino-3-[[(3R)-5-[(1S)-1-amino-2-hydroxy-2-oxo-ethyl]-2,3-dihydro-1,2-oxazol-3-yl]sulfanyl]propanoic
      acid
    - S-{(3R)-5-[(S)-amino(carboxy)methyl]-2,3-dihydroisoxazol-3-yl}-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: '143'
    structure: '[O-]C(=O)[C@H](CS[C@H]1NOC(=C1)[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  '175':
    id: '175'
    name: 3,5-dihydro-5-methylidene-4h-imidazol-4-on
    synonyms:
    - 2-[2-[(1S)-1-aminoethyl]-4-(aminomethyl)-5-oxo-imidazolidin-1-yl]ethanoic acid
    - '[(2S,4S)-2-[(1S)-1-aminoethyl]-4-(aminomethyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    - ASG
    identifiers:
    - ns: pdb-ccd
      id: '175'
    structure: '[O-]C(=O)CN1C(NC(C1=O)C[NH3+])[C@@H]([NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  '193':
    id: '193'
    name: (2s)-4-(beta-alanylamino)-2-aminobutanoic acid
    synonyms:
    - (2S)-4-(beta-alanylamino)-2-aminobutanoic acid
    - X
    - (2S)-2-amino-4-(3-aminopropanoylamino)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: '193'
    structure: '[O-]C(=O)[C@@H]([NH3+])CCNC(=O)CC[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  19W:
    id: 19W
    name: 5-(aminooxy)-l-norvaline
    synonyms:
    - 5-(aminooxy)-L-norvaline
    - (2S)-2-azanyl-5-azanyloxy-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 19W
    structure: NOCCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  1C3:
    id: 1C3
    name: 1-(3,4,5-trimethoxybenzyl)-l-proline
    synonyms:
    - (2S)-1-[(3,4,5-trimethoxyphenyl)methyl]pyrrolidine-2-carboxylic acid
    - 1-(3,4,5-trimethoxybenzyl)-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 1C3
    structure: COc1cc(CN2CCC[C@H]2C(=O)[O-])cc(c1OC)OC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
  '1E3':
    id: '1E3'
    name: (2s)-2,9-diaminononanoic acid
    synonyms:
    - (2S)-2,9-diaminononanoic acid
    - (2S)-2,9-bis(azanyl)nonanoic acid
    identifiers:
    - ns: pdb-ccd
      id: '1E3'
    structure: '[NH3+]CCCCCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  1G2:
    id: 1G2
    name: (2s)-2-azido-3-phenylpropanoic acid
    synonyms:
    - (2S)-2-azido-3-phenyl-propanoic acid
    - (2S)-2-azido-3-phenylpropanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1G2
    structure: '[O-]C(=O)[C@@H](N=[N+]=[N-])Cc1ccccc1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  1G3:
    id: 1G3
    name: (2s)-1-[4-(aminomethyl)phenyl]-4-(methylsulfonyl)butan-2-amine
    synonyms:
    - (2S)-1-[4-(aminomethyl)phenyl]-4-methylsulfonyl-butan-2-amine
    - (2S)-1-[4-(aminomethyl)phenyl]-4-(methylsulfonyl)butan-2-amine
    identifiers:
    - ns: pdb-ccd
      id: 1G3
    structure: '[NH3+]Cc1ccc(cc1)C[C@@H](CCS(=O)(=O)C)[NH3+]'
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  1ME:
    id: 1ME
    name: (2s)-2-amino-3-methylsulfanyl-butanoic acid
    synonyms:
    - (2S)-2-amino-3-methylsulfanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1ME
    structure: CSC([C@H](C(=O)[O-])[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  1MH:
    id: 1MH
    name: 3-pyridin-3-yl-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-pyridin-3-yl-propanoic acid
    - 3-pyridin-3-yl-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 1MH
    structure: '[O-]C(=O)[C@H](Cc1cccnc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  1OP:
    id: 1OP
    name: o-(5-hydroxypentyl)-l-tyrosine
    synonyms:
    - O-(5-hydroxypentyl)-L-tyrosine
    - Y
    - (2S)-2-azanyl-3-[4-(5-oxidanylpentoxy)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1OP
    structure: OCCCCCOc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  1PA:
    id: 1PA
    name: 4-(carboxymethyl)-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-azanyl-3-[4-(carboxymethyl)phenyl]propanoic acid
    - 4-(carboxymethyl)-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 1PA
    structure: '[O-]C(=O)Cc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  1PI:
    id: 1PI
    name: (3r)-3-[(2s)-2-amino-3-oxopropyl]piperidine-1-carboximidamide
    synonyms:
    - A
    - (3R)-3-[(2S)-2-amino-3-oxopropyl]piperidine-1-carboximidamide
    - (3R)-3-[(2S)-2-azanyl-3-oxo-propyl]piperidine-1-carboximidamide
    identifiers:
    - ns: pdb-ccd
      id: 1PI
    structure: '[O-]C(=O)[C@H](C[C@H]1CCCN(C1)C(=[NH2+])N)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  1TQ:
    id: 1TQ
    name: 6-(formylamino)-7-hydroxy-l-tryptophan
    synonyms:
    - 6-(formylamino)-7-hydroxy-L-tryptophan
    - (2S)-2-amino-3-(6-formamido-7-hydroxy-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: 1TQ
    structure: O=CNc1ccc2c(c1O)[nH]cc2C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  1TX:
    id: 1TX
    name: (2s)-2-amino-7-methoxy-7-oxoheptanoic acid
    synonyms:
    - (2S)-2-azanyl-7-methoxy-7-oxidanylidene-heptanoic acid
    - (2S)-2-amino-7-methoxy-7-oxoheptanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1TX
    structure: COC(=O)CCCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  1TY:
    id: 1TY
    name: 3-{(3e)-4-hydroxy-6-oxo-3-[(2-phenylethyl)imino]cyclohexa-1,4-dien-1-yl}alanine
    synonyms:
    - (2S)-2-amino-3-[(3E)-4-hydroxy-6-oxo-3-phenethylimino-1-cyclohexa-1,4-dienyl]propanoic
      acid
    - 3-{(3E)-4-hydroxy-6-oxo-3-[(2-phenylethyl)imino]cyclohexa-1,4-dien-1-yl}-L-alanine
    - Y
    identifiers:
    - ns: pdb-ccd
      id: 1TY
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N\CCc2ccccc2)/C(=CC1=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  1U8:
    id: 1U8
    name: (3s)-3-amino-5-[(2,6-dimethylbenzoyl)oxy]-4-oxopentanoic acid
    synonyms:
    - (3S)-3-amino-5-[(2,6-dimethylbenzoyl)oxy]-4-oxopentanoic acid
    - (3S)-3-azanyl-5-(2,6-dimethylphenyl)carbonyloxy-4-oxidanylidene-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1U8
    structure: '[O-]C(=O)C[C@@H](C(=O)COC(=O)c1c(C)cccc1C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  1VR:
    id: 1VR
    name: (3r)-3-amino-4-methylpentanoic acid
    synonyms:
    - (3R)-3-amino-4-methylpentanoic acid
    - (3R)-3-azanyl-4-methyl-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1VR
    structure: '[NH3+][C@@H](C(C)C)CC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  1X6:
    id: 1X6
    name: o-[(2e)-3-aminoprop-2-enoyl]-l-serine
    synonyms:
    - S
    - O-[(2E)-3-aminoprop-2-enoyl]-L-serine
    - (2S)-2-azanyl-3-[(E)-3-azanylprop-2-enoyl]oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 1X6
    structure: '[O-]C(=O)[C@@H]([NH3+])COC(=O)/C=C/N'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  1XW:
    id: 1XW
    name: (1as,4s,6ar,7as)-octahydro-1h-cyclopropa[4,5]pyrrolo[1,2-a]pyrazine-4-carboxylic
      acid
    synonyms:
    - (1aS,4S,6aR,7aS)-1a,3,4,5,6,6a,7,7a-octahydro-1H-cyclopropa[3,4]pyrrolo[3,5-b]pyrazine-4-carboxylic
      acid
    - (1aS,4S,6aR,7aS)-octahydro-1H-cyclopropa[4,5]pyrrolo[1,2-a]pyrazine-4-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 1XW
    structure: '[O-]C(=O)[C@H]1NC[C@@H]2[NH+](C1)[C@H]1C[C@H]1C2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  '200':
    id: '200'
    name: 4-chloro-l-phenylalanine
    synonyms:
    - F
    - 4-chloro-L-phenylalanine
    - (2S)-2-amino-3-(4-chlorophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: '200'
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)Cl'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  22G:
    id: 22G
    name: n-[(2s)-2-amino-3-phenylpropyl]-l-tyrosine
    synonyms:
    - (2S)-2-[[(2S)-2-azanyl-3-phenyl-propyl]amino]-3-(4-hydroxyphenyl)propanoic acid
    - N-[(2S)-2-amino-3-phenylpropyl]-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: 22G
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)O)[NH2+]C[C@H](Cc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  23P:
    id: 23P
    name: 3-(propanoylamino)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-(propanoylamino)propanoic acid
    - 3-(propanoylamino)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 23P
    structure: '[O-]C(=O)[C@@H]([NH3+])CNC(=O)CC'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  23S:
    id: 23S
    name: (s)-2-amino-3-(6h-selenolo[2,3-b]-pyrrol-4-yl)-propionic acid
    synonyms:
    - (2S)-2-amino-3-(6H-selenopheno[3,2-d]pyrrol-4-yl)propanoic acid
    - X
    - 3-(6H-selenopheno[2,3-b]pyrrol-4-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 23S
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc[se]2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  26B:
    id: 26B
    name: o-tert-butyl-n-[(3-{[(2,4,6-trimethylphenyl)carbamoyl]amino}naphthalen-2-yl)carbonyl]-l-threonine
    synonyms:
    - O-tert-butyl-N-[(3-{[(2,4,6-trimethylphenyl)carbamoyl]amino}naphthalen-2-yl)carbonyl]-L-threonine
    - T
    - (2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[[3-[(2,4,6-trimethylphenyl)carbamoylamino]naphthalen-2-yl]carbonylamino]butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 26B
    structure: O=C(Nc1c(C)cc(cc1C)C)Nc1cc2ccccc2cc1C(=O)N[C@@H]([C@H](OC(C)(C)C)C)C(=O)[O-]
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 37
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 39
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
  28X:
    id: 28X
    name: o-[(r)-{[(3r)-3,4-dihydroxybutyl]oxy}(hydroxy)phosphoryl]-l-threonine
    synonyms:
    - (2S,3R)-2-azanyl-3-[[(3R)-3,4-bis(oxidanyl)butoxy]-oxidanyl-phosphoryl]oxy-butanoic
      acid
    - O-[(R)-{[(3R)-3,4-dihydroxybutyl]oxy}(hydroxy)phosphoryl]-L-threonine
    identifiers:
    - ns: pdb-ccd
      id: 28X
    structure: OC[C@@H](CCOP(=O)(O[C@@H]([C@@H](C(=O)[O-])[NH3+])C)[O-])O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  2AD:
    id: 2AD
    name: 2'-amino-2'-deoxyadenosine
    synonyms:
    - (2R,3S,4R,5R)-4-amino-5-(6-aminopurin-9-yl)-2-(hydroxymethyl)oxolan-3-ol
    - X
    - 2'-amino-2'-deoxyadenosine
    identifiers:
    - ns: pdb-ccd
      id: 2AD
    structure: OC[C@H]1O[C@H]([C@@H]([C@@H]1O)[NH3+])n1cnc2c1ncnc2N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  2AG:
    id: 2AG
    name: (2s)-2-aminopent-4-enoic acid
    synonyms:
    - A
    - (2S)-2-azanylpent-4-enoic acid
    - (2S)-2-aminopent-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2AG
    structure: '[O-]C(=O)[C@@H]([NH3+])CC=C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  2AS:
    id: 2AS
    name: (2s,3s)-3-methyl-aspartic acid
    synonyms:
    - (3S)-3-methyl-L-aspartic acid
    - (2S,3S)-2-azanyl-1,4-dihydroxy-3-methyl-butane-1,1-dione
    - X
    identifiers:
    - ns: pdb-ccd
      id: 2AS
    structure: O[C][C@H]([C@@H]([C](=O)(=O)O)N)C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  2CO:
    id: 2CO
    name: s-hydroperoxycysteine
    synonyms:
    - S-hydroperoxy-L-cysteine
    - (2R)-2-amino-3-hydroperoxysulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 2CO
    structure: '[O-]C(=O)[C@@H]([NH3+])CSOO'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  2DO:
    id: 2DO
    name: (2s)-2-aminohexane-1,1-diol
    synonyms:
    - (2S)-2-aminohexane-1,1-diol
    - X
    identifiers:
    - ns: pdb-ccd
      id: 2DO
    structure: CCCC[C@@H](C(O)O)[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  2FM:
    id: 2FM
    name: s-(difluoromethyl)homocysteine
    synonyms:
    - M
    - (2S)-2-amino-4-(difluoromethylsulfanyl)butanoic acid
    - difluoro-L-methionine
    identifiers:
    - ns: pdb-ccd
      id: 2FM
    structure: FC(SCC[C@@H](C(=O)[O-])[NH3+])F
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  2GX:
    id: 2GX
    name: beta-phenyl-l-phenylalanine
    synonyms:
    - (2S)-2-azanyl-3,3-diphenyl-propanoic acid
    - beta-phenyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 2GX
    structure: '[NH3+][C@@H](C(c1ccccc1)c1ccccc1)C(=O)[O-]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  2HF:
    id: 2HF
    name: 2-fluoro-l-histidine
    synonyms:
    - (2S)-2-azanyl-3-(2-fluoro-1H-imidazol-3-ium-4-yl)propanoic acid
    - H
    - 3-(2-fluoro-1H-imidazol-3-ium-4-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 2HF
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c(n1)F'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  2JC:
    id: 2JC
    name: n-ethylglycine
    synonyms:
    - 2-(ethylamino)ethanoic acid
    - N-ethylglycine
    identifiers:
    - ns: pdb-ccd
      id: 2JC
    structure: '[O-]C(=O)C[NH2+]CC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  2JF:
    id: 2JF
    name: (2s)-2-amino-3-oxopropyl 4-{[(2s)-2-hydroxy-4-methylpentanoyl]amino}butanoate
    synonyms:
    - '[(2S)-2-azanyl-3-oxidanylidene-propyl] 4-[[(2S)-4-methyl-2-oxidanyl-pentanoyl]amino]butanoate'
    - (2S)-2-amino-3-oxopropyl 4-{[(2S)-2-hydroxy-4-methylpentanoyl]amino}butanoate
    identifiers:
    - ns: pdb-ccd
      id: 2JF
    structure: CC(C[C@@H](C(=O)NCCCC(=O)OC[C@@H](C(=O)[O-])[NH3+])O)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  2JG:
    id: 2JG
    name: (2s)-2-amino-3-oxopropyl hexanoate
    synonyms:
    - '[(2S)-2-azanyl-3-oxidanylidene-propyl] hexanoate'
    - (2S)-2-amino-3-oxopropyl hexanoate
    identifiers:
    - ns: pdb-ccd
      id: 2JG
    structure: CCCCCC(=O)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  2JH:
    id: 2JH
    name: 3-cyclobutyl-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-cyclobutyl-propanoic acid
    - 3-cyclobutyl-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 2JH
    structure: '[NH3+][C@H](C(=O)[O-])CC1CCC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  2KK:
    id: 2KK
    name: n~6~-(4-fluorobenzoyl)-l-lysine
    synonyms:
    - N~6~-(4-fluorobenzoyl)-L-lysine
    - K
    - (2S)-2-azanyl-6-[(4-fluorophenyl)carbonylamino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2KK
    structure: '[NH3+][C@H](C(=O)[O-])CCCCNC(=O)c1ccc(cc1)F'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  2KP:
    id: 2KP
    name: n~6~-(4-bromobenzoyl)-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[(4-bromophenyl)carbonylamino]hexanoic acid
    - K
    - N~6~-(4-bromobenzoyl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 2KP
    structure: '[NH3+][C@H](C(=O)[O-])CCCCNC(=O)c1ccc(cc1)Br'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  2KY:
    id: 2KY
    name: (2s)-amino(cyclopentyl)ethanoic acid
    synonyms:
    - (2S)-amino(cyclopentyl)ethanoic acid
    - (2S)-2-azanyl-2-cyclopentyl-ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2KY
    structure: '[NH3+][C@H](C(=O)[O-])C1CCCC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  2L5:
    id: 2L5
    name: 2-chloro-l-phenylalanine
    synonyms:
    - (2S)-2-azanyl-3-(2-chlorophenyl)propanoic acid
    - 2-chloro-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 2L5
    structure: '[O-]C(=O)[C@H](Cc1ccccc1Cl)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  2L6:
    id: 2L6
    name: (3s,6r,8as)-5-oxo-1,2,3,8a-tetrahydrospiro[indolizine-6,2'-pyrrolidine]-3-carboxylic
      acid
    synonyms:
    - (3S,6R,8aS)-5-oxidanylidenespiro[1,2,3,8a-tetrahydroindolizine-6,2'-pyrrolidine]-3-carboxylic
      acid
    - (3S,6R,8aS)-5-oxo-1,2,3,8a-tetrahydrospiro[indolizine-6,2'-pyrrolidine]-3-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 2L6
    structure: '[O-]C(=O)[C@@H]1CC[C@@H]2N1C(=O)[C@@]1(C=C2)[NH2+]CCC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  2L9:
    id: 2L9
    name: (3ar,5as,8s,10as)-10-oxo-1,2,3,3a,5a,8,10,10a-octahydrodipyrrolo[1,2-a:3',2'-e]azepine-8-carboxylic
      acid
    synonyms:
    - (3aR,5aS,8S,10aS)-10-oxidanylidene-2,3,3a,5a,8,10a-hexahydro-1H-dipyrrolo[3,2-b:3',1'-f]azepine-8-carboxylic
      acid
    - (3aR,5aS,8S,10aS)-10-oxo-1,2,3,3a,5a,8,10,10a-octahydrodipyrrolo[1,2-a:3',2'-e]azepine-8-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 2L9
    structure: '[O-]C(=O)[C@@H]1C=C[C@H]2N1C(=O)[C@H]1[NH2+]CC[C@@H]1C=C2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  2LT:
    id: 2LT
    name: 3,5-dichloro-l-tyrosine
    synonyms:
    - 3,5-dichloro-L-tyrosine
    - (2S)-2-azanyl-3-[3,5-bis(chloranyl)-4-oxidanyl-phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2LT
    structure: '[O-]C(=O)[C@H](Cc1cc(Cl)c(c(c1)Cl)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  2ML:
    id: 2ML
    name: 2-methylleucine
    synonyms:
    - (2S)-2-amino-2,4-dimethyl-pentanoic acid
    - 2-methyl-L-leucine
    - L
    identifiers:
    - ns: pdb-ccd
      id: 2ML
    structure: CC(C[C@@](C(=O)[O-])([NH3+])C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  2MT:
    id: 2MT
    name: (4r)-2,2-dimethyl-1,3-thiazolidine-4-carboxylic acid
    synonyms:
    - P
    - (4R)-2,2-dimethyl-1,3-thiazolidine-4-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 2MT
    structure: '[O-]C(=O)[C@@H]1CSC([NH2+]1)(C)C'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  2OR:
    id: 2OR
    name: amino{[(2r,3r,4s)-4-amino-2,3,5-trihydroxy-5-oxopentyl]amino}methaniminium
    synonyms:
    - '[azanyl-[[(2R,3R,4S)-4-azanyl-2,3,5-tris(oxidanyl)-5-oxidanylidene-pentyl]amino]methylidene]azanium'
    - amino{[(2R,3R,4S)-4-amino-2,3,5-trihydroxy-5-oxopentyl]amino}methaniminium
    - R
    identifiers:
    - ns: pdb-ccd
      id: 2OR
    structure: O[C@@H]([C@@H]([C@@H](C(=O)[O-])[NH3+])O)CNC(=[NH2+])N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  2P0:
    id: 2P0
    name: 1-({[(s)-hydroxy(phosphonooxy)phosphoryl]oxy}acetyl)-l-proline
    synonyms:
    - 1-({[(S)-hydroxy(phosphonooxy)phosphoryl]oxy}acetyl)-L-proline
    - (2S)-1-[2-[hydroxy(phosphonooxy)phosphoryl]oxyethanoyl]pyrrolidine-2-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 2P0
    structure: '[O-]C(=O)[C@@H]1CCCN1C(=O)COP(=O)(OP(=O)([O-])[O-])[O-]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  2QD:
    id: 2QD
    name: (4r)-4-[3-(methylamino)-3-oxopropyl]-l-glutamic acid
    synonyms:
    - (2S,4R)-2-azanyl-4-[3-(methylamino)-3-oxidanylidene-propyl]pentanedioic acid
    - (4R)-4-[3-(methylamino)-3-oxopropyl]-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: 2QD
    structure: CNC(=O)CC[C@@H](C(=O)[O-])C[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  2QZ:
    id: 2QZ
    name: n,n-dimethyl-l-threonine
    synonyms:
    - (2S,3R)-2-(dimethylamino)-3-oxidanyl-butanoic acid
    - T
    - N,N-dimethyl-L-threonine
    identifiers:
    - ns: pdb-ccd
      id: 2QZ
    structure: C[NH+]([C@H](C(=O)[O-])[C@H](O)C)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
  2R3:
    id: 2R3
    name: (betar)-beta-hydroxy-o-methyl-l-tyrosine
    synonyms:
    - (2S,3R)-2-azanyl-3-(4-methoxyphenyl)-3-oxidanyl-propanoic acid
    - (betaR)-beta-hydroxy-O-methyl-L-tyrosine
    - Y
    identifiers:
    - ns: pdb-ccd
      id: 2R3
    structure: COc1ccc(cc1)[C@H]([C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  2RX:
    id: 2RX
    name: o-thiophosphono-l-serine
    synonyms:
    - O-thiophosphono-L-serine
    - (2S)-2-azanyl-3-[oxidanyl(sulfanyl)phosphoryl]oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2RX
    structure: '[O-]C(=O)[C@H](COP(=O)(O)[S-])[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  2SO:
    id: 2SO
    name: 3-{3-[(3r)-3,4-dihydroxybutyl]-1-(8-phenyloctyl)-1h-imidazol-3-ium-5-yl}-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[1-[(3R)-3,4-bis(oxidanyl)butyl]-3-(8-phenyloctyl)imidazol-1-ium-4-yl]propanoic
      acid
    - 3-{3-[(3R)-3,4-dihydroxybutyl]-1-(8-phenyloctyl)-1H-imidazol-3-ium-5-yl}-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 2SO
    structure: OC[C@@H](CC[n+]1cc(n(c1)CCCCCCCCc1ccccc1)C[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 29
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 32
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    - molecule: Monomer
      element: H
      position: 32
      charge: 1
  2TY:
    id: 2TY
    name: 2-hydroxy-5-{[(1e)-2-phenylethylidene]amino}-l-tyrosine
    synonyms:
    - (2S)-2-amino-3-[2,4-dihydroxy-5-(phenethylideneamino)phenyl]propanoic acid
    - Y
    - 2-hydroxy-5-{[(1E)-2-phenylethylidene]amino}-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: 2TY
    structure: '[O-]C(=O)[C@H](Cc1cc(/N=C/Cc2ccccc2)c(cc1O)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  2VA:
    id: 2VA
    name: 2'-(l-valyl)amino-2'-deoxyadenosine
    synonyms:
    - V
    - (2S)-2-amino-N-[(2R,3R,4S,5R)-2-(6-aminopurin-9-yl)-4-hydroxy-5-(hydroxymethyl)oxolan-3-yl]-3-methyl-butanamide
    - 2'-deoxy-2'-(L-valylamino)adenosine
    identifiers:
    - ns: pdb-ccd
      id: 2VA
    structure: OC[C@H]1O[C@H]([C@@H]([C@@H]1O)NC(=O)[C@H](C(C)C)[NH3+])n1cnc2c1ncnc2N
    base_monomers:
    - V
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  2XA:
    id: 2XA
    name: (2r)-2-amino-3-[(4-chlorophenyl)-diphenyl-methyl]sulfanyl-propanoic acid
    synonyms:
    - (2R)-2-amino-3-[(4-chlorophenyl)-diphenyl-methyl]sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 2XA
    structure: Clc1ccc(cc1)C(c1ccccc1)(c1ccccc1)SC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 28
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    - molecule: Monomer
      element: H
      position: 28
      charge: 1
  2YC:
    id: 2YC
    name: n~6~-{[(2s,3s)-3-methyl-3,4-dihydro-2h-pyrrol-2-yl]carbonyl}-l-lysine
    synonyms:
    - N~6~-{[(2S,3S)-3-methyl-3,4-dihydro-2H-pyrrol-2-yl]carbonyl}-L-lysine
    - (2S)-2-azanyl-6-[[(2S,3S)-3-methyl-3,4-dihydro-2H-pyrrol-2-yl]carbonylamino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 2YC
    structure: '[O-]C(=O)[C@H](CCCCNC(=O)[C@H]1N=CC[C@@H]1C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  2YF:
    id: 2YF
    name: n~6~-[(2r)-2,3,4,5-tetrahydropyridin-2-ylcarbonyl]-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[[(2R)-2,3,4,5-tetrahydropyridin-2-yl]carbonylamino]hexanoic
      acid
    - N~6~-[(2R)-2,3,4,5-tetrahydropyridin-2-ylcarbonyl]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 2YF
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCCNC(=O)[C@H]1CCCC=N1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  2YG:
    id: 2YG
    name: n~6~-l-lysyl-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[[(2S)-2,6-bis(azanyl)hexanoyl]amino]hexanoic acid
    - N~6~-L-lysyl-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 2YG
    structure: '[NH3+]CCCC[C@@H](C(=O)NCCCC[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  2YH:
    id: 2YH
    name: n~5~-d-ornithyl-l-ornithine
    synonyms:
    - N~5~-D-ornithyl-L-ornithine
    - (2S)-2-azanyl-5-[[(2R)-2,5-bis(azanyl)pentanoyl]amino]pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 2YH
    structure: '[NH3+]CCC[C@H](C(=O)NCCC[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  2YJ:
    id: 2YJ
    name: n~5~-d-lysyl-l-ornithine
    synonyms:
    - (2S)-2-azanyl-5-[[(2R)-2,6-bis(azanyl)hexanoyl]amino]pentanoic acid
    - N~5~-D-lysyl-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: 2YJ
    structure: '[NH3+]CCCC[C@H](C(=O)NCCC[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  2ZC:
    id: 2ZC
    name: o-{[4-(2-aminoethyl)phenyl]sulfonyl}-l-serine
    synonyms:
    - (2S)-2-azanyl-3-[4-(2-azanylethyl)phenyl]sulfonyloxy-propanoic acid
    - O-{[4-(2-aminoethyl)phenyl]sulfonyl}-L-serine
    identifiers:
    - ns: pdb-ccd
      id: 2ZC
    structure: '[NH3+]CCc1ccc(cc1)S(=O)(=O)OC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  30V:
    id: 30V
    name: s-[(2-carbamoylphenyl)selanyl]-l-cysteine
    synonyms:
    - (2R)-3-(2-aminocarbonylphenyl)selanylsulfanyl-2-azanyl-propanoic acid
    - S-[(2-carbamoylphenyl)selanyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: 30V
    structure: '[NH3+][C@H](C(=O)[O-])CS[Se]c1ccccc1C(=O)N'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  32L:
    id: 32L
    name: ethyl (3s,4s)-4-amino-3-hydroxy-6-methylheptanoate
    synonyms:
    - ethyl (3S,4S)-4-amino-3-hydroxy-6-methylheptanoate
    - ethyl (3S,4S)-4-azanyl-6-methyl-3-oxidanyl-heptanoate
    identifiers:
    - ns: pdb-ccd
      id: 32L
    structure: CCOC(=O)C[C@@H]([C@H](CC(C)C)[NH3+])O
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  32S:
    id: 32S
    name: (s)-2-amino-3-(4h-selenolo[3,2-b]-pyrrol-6-yl)-propionic acid
    synonyms:
    - 3-(4H-selenopheno[3,2-b]pyrrol-6-yl)-L-alanine
    - (2S)-2-amino-3-(4H-selenopheno[2,3-d]pyrrol-6-yl)propanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: 32S
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1[se]cc2)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  32T:
    id: 32T
    name: (s)-2-amino-3-(4h-thieno[3,2-b]-pyrrol-6-yl)-propionic acid
    synonyms:
    - (2S)-2-amino-3-(4H-thieno[2,3-d]pyrrol-6-yl)propanoic acid
    - X
    - 3-(4H-thieno[3,2-b]pyrrol-6-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 32T
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1scc2)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  33S:
    id: 33S
    name: 3-iodo-l-phenylalanine
    synonyms:
    - 3-iodo-L-phenylalanine
    - (2S)-2-azanyl-3-(3-iodanylphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 33S
    structure: '[O-]C(=O)[C@H](Cc1cccc(c1)I)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  33W:
    id: 33W
    name: 3-(5-bromothiophen-2-yl)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-(5-bromanylthiophen-2-yl)propanoic acid
    - 3-(5-bromothiophen-2-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 33W
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1ccc(s1)Br'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  34E:
    id: 34E
    name: (3r)-4-[4-(2-methoxyethyl)piperazin-1-yl]-n-methyl-l-valine
    synonyms:
    - (2S,3R)-4-[4-(2-methoxyethyl)piperazin-1-yl]-3-methyl-2-(methylamino)butanoic
      acid
    - (3R)-4-[4-(2-methoxyethyl)piperazin-1-yl]-N-methyl-L-valine
    identifiers:
    - ns: pdb-ccd
      id: 34E
    structure: COCC[NH+]1CCN(CC1)C[C@H]([C@@H](C(=O)[O-])[NH2+]C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  35Y:
    id: 35Y
    name: 3-[(1h-tetrazol-5-ylcarbonyl)amino]-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-(1H-1,2,3,4-tetrazol-5-ylcarbonylamino)propanoic acid
    - 3-[(1H-tetrazol-5-ylcarbonyl)amino]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 35Y
    structure: '[O-]C(=O)[C@H](CNC(=O)c1[n-]nnn1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  3A5:
    id: 3A5
    name: (2z,4s)-3-aza-5-carboxyl-2-methyl-4(methylcarboxy)pent-2-enoyl
    synonyms:
    - (3S)-4-methoxy-4-oxidanylidene-3-[(E)-(1-oxidanyl-1-oxidanylidene-propan-2-ylidene)amino]butanoic
      acid
    - (3S)-3-[(E)-(1-carboxyethylidene)amino]-4-methoxy-4-oxobutanoic acid (non-preferred
      name)
    identifiers:
    - ns: pdb-ccd
      id: 3A5
    structure: COC(=O)[C@@H](/N=C(/C(=O)[O-])\C)CC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
  3AH:
    id: 3AH
    name: '[histidin-1-yl-4h-[1,2,4]triazol-5-yl]-amine'
    synonyms:
    - 1-(3-amino-1H-1,2,4-triazol-5-yl)-L-histidine
    - (2S)-2-amino-3-[1-(5-amino-2H-1,2,4-triazol-3-yl)imidazol-4-yl]propanoic acid
    - H
    identifiers:
    - ns: pdb-ccd
      id: 3AH
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1cn(cn1)c1nc(n[nH]1)N'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  3AR:
    id: 3AR
    name: n-omega-propyl-l-arginine
    synonyms:
    - '{[(4S)-4-amino-4-carboxybutyl]amino}(propylamino)methaniminium'
    - X
    - '[[[(4S)-4-amino-5-hydroxy-5-oxo-pentyl]amino]-propylamino-methylidene]azanium'
    identifiers:
    - ns: pdb-ccd
      id: 3AR
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCNC(=[NH2+])NCCC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  3BY:
    id: 3BY
    name: 1-methyl-l-proline
    synonyms:
    - (2S)-1-methylpyrrolidine-2-carboxylic acid
    - 1-methyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 3BY
    structure: C[NH+]1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
  3CF:
    id: 3CF
    name: 3-cyano-l-phenylalanine
    synonyms:
    - F
    - 3-cyano-L-phenylalanine
    - (2S)-2-azanyl-3-(3-cyanophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3CF
    structure: N#Cc1cccc(c1)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  3CT:
    id: 3CT
    name: 3-chloro-l-tyrosine
    synonyms:
    - 3-chloro-L-tyrosine
    - (2S)-2-azanyl-3-(3-chloranyl-4-oxidanyl-phenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3CT
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)Cl)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  3EG:
    id: 3EG
    name: (2s)-2-amino-4,4,4-trifluorobutanoic acid
    synonyms:
    - (2S)-2-amino-4,4,4-trifluorobutanoic acid
    - (2S)-2-azanyl-4,4,4-tris(fluoranyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3EG
    structure: '[NH3+][C@H](C(=O)[O-])CC(F)(F)F'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  3FG:
    id: 3FG
    name: (2s)-amino(3,5-dihydroxyphenyl)ethanoic acid
    synonyms:
    - (2S)-2-azanyl-2-(3,5-dihydroxyphenyl)ethanoic acid
    - (2S)-amino(3,5-dihydroxyphenyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3FG
    structure: '[NH3+][C@@H](c1cc(O)cc(c1)O)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  3GA:
    id: 3GA
    name: (3s)-3-[(2s)-2-amino-3-oxopropyl]piperidine-1-carboximidamide
    synonyms:
    - A
    - (3S)-3-[(2S)-2-amino-3-oxopropyl]piperidine-1-carboximidamide
    - (3S)-3-[(2S)-2-azanyl-3-oxo-propyl]piperidine-1-carboximidamide
    identifiers:
    - ns: pdb-ccd
      id: 3GA
    structure: '[O-]C(=O)[C@H](C[C@@H]1CCCN(C1)C(=[NH2+])N)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  3K4:
    id: 3K4
    name: (2s,3s)-3-methylaziridine-2-carboxylic acid
    synonyms:
    - (2S,3S)-3-methylaziridine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 3K4
    structure: '[O-]C(=O)[C@@H]1[C@@H]([NH2+]1)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  3O3:
    id: 3O3
    name: n-[(3s)-3-amino-3-carboxypropyl]-l-glutamic acid
    synonyms:
    - N-[(3S)-3-amino-3-carboxypropyl]-L-glutamic acid
    - (2S)-2-[[(3S)-3-azanyl-4-hydroxy-4-oxo-butyl]amino]pentanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: 3O3
    structure: '[O-]C(=O)CC[C@@H](C(=O)[O-])[NH2+]CC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  3PM:
    id: 3PM
    name: o-tert-butyl-d-serine
    synonyms:
    - (2R)-2-azanyl-3-[(2-methylpropan-2-yl)oxy]propanoic acid
    - O-tert-butyl-D-serine
    identifiers:
    - ns: pdb-ccd
      id: 3PM
    structure: '[NH3+][C@@H](C(=O)[O-])COC(C)(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  3PX:
    id: 3PX
    name: (3s)-3-(propan-2-yloxy)-l-proline
    synonyms:
    - (2S,3S)-3-propan-2-yloxypyrrolidine-2-carboxylic acid
    - (3S)-3-(propan-2-yloxy)-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 3PX
    structure: CC(O[C@H]1CC[NH2+][C@@H]1C(=O)[O-])C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  3QN:
    id: 3QN
    name: (e)-n~6~-{2-hydroxy-3-methyl-6-[(phosphonooxy)methyl]benzylidene}-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[(E)-[2-hydroxy-3-methyl-6-(phosphonooxymethyl)phenyl]methylideneamino]hexanoic
      acid
    - K
    - (E)-N~6~-{2-hydroxy-3-methyl-6-[(phosphonooxy)methyl]benzylidene}-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 3QN
    structure: '[O-]C(=O)[C@H](CCCC/N=C/c1c(ccc(c1O)C)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  3TY:
    id: 3TY
    name: 3-[(3e)-3-(benzylhydrazono)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-l-alanine
    synonyms:
    - (2S)-2-amino-3-[(3E)-4-hydroxy-6-oxo-3-(phenylmethylhydrazinylidene)-1-cyclohexa-1,4-dienyl]propanoic
      acid
    - X
    - 3-[(3E)-3-(benzylhydrazono)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: 3TY
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N\NCc2ccccc2)/C(=CC1=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  3WS:
    id: 3WS
    name: n,2-dimethyl-l-alanine
    synonyms:
    - N,2-dimethyl-L-alanine
    - 2-methyl-2-(methylamino)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3WS
    structure: '[O-]C(=O)C([NH2+]C)(C)C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  3X9:
    id: 3X9
    name: 3-{[(1-hydroxy-2,2,5,5-tetramethyl-2,5-dihydro-1h-pyrrol-3-yl)methyl]disulfanyl}-l-alanine
    synonyms:
    - 3-{[(1-hydroxy-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrol-3-yl)methyl]disulfanyl}-L-alanine
    - (2R)-2-azanyl-3-[(2,2,5,5-tetramethyl-1-oxidanyl-pyrrol-3-yl)methyldisulfanyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 3X9
    structure: '[NH3+][C@H](C(=O)[O-])CSSCC1=CC(N(C1(C)C)O)(C)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  3XH:
    id: 3XH
    name: 3-hydroxyhippuric acid
    synonyms:
    - G
    - N-[(3-hydroxyphenyl)carbonyl]glycine
    - 2-[(3-hydroxyphenyl)carbonylamino]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 3XH
    structure: '[O-]C(=O)CNC(=O)c1cccc(c1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  3YM:
    id: 3YM
    name: 3-methoxy-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-(3-methoxy-4-oxidanyl-phenyl)propanoic acid
    - 3-methoxy-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: 3YM
    structure: COc1cc(ccc1O)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  3ZH:
    id: 3ZH
    name: 11-{4-[(2s)-2-amino-2-carboxyethyl]-3-(8-phenyloctyl)-2,3-dihydro-1h-imidazol-1-yl}undecanoic
      acid
    synonyms:
    - 11-{4-[(2S)-2-amino-2-carboxyethyl]-3-(8-phenyloctyl)-2,3-dihydro-1H-imidazol-1-yl}undecanoic
      acid
    - 11-[4-[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]-3-(8-phenyloctyl)-2H-imidazol-1-yl]undecanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 3ZH
    structure: '[O-]C(=O)CCCCCCCCCCN1C=C(N(C1)CCCCCCCCc1ccccc1)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 36
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 39
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    - molecule: Monomer
      element: H
      position: 39
      charge: 1
  3ZL:
    id: 3ZL
    name: n~6~-[(1z)-4-amino-3-oxopenta-1,4-dien-1-yl]-l-lysine
    synonyms:
    - N~6~-[(1Z)-4-amino-3-oxopenta-1,4-dien-1-yl]-L-lysine
    - (2S)-2-azanyl-6-[[(1Z)-4-azanyl-3-oxidanylidene-penta-1,4-dienyl]amino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 3ZL
    structure: '[O-]C(=O)[C@H](CCCCN/C=C\C(=O)C(=C)N)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  41H:
    id: 41H
    name: (betas)-beta-methyl-l-phenylalanine
    synonyms:
    - (betaS)-beta-methyl-L-phenylalanine
    - (2S,3S)-2-azanyl-3-phenyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 41H
    structure: C[C@H]([C@@H](C(=O)[O-])[NH3+])c1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  41Q:
    id: 41Q
    name: 4-imino-l-homoserine
    synonyms:
    - 4-imino-L-homoserine
    - (2S)-2-azanyl-4-azanylidene-4-oxidanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 41Q
    structure: '[O-]C(=[NH2+])C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  '432':
    id: '432'
    name: o-butanoyl-l-serine
    synonyms:
    - (2S)-2-azanyl-3-butanoyloxy-propanoic acid
    - O-butanoyl-L-serine
    identifiers:
    - ns: pdb-ccd
      id: '432'
    structure: '[O-]C(=O)[C@@H]([NH3+])COC(=O)CCC'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  4AF:
    id: 4AF
    name: 4-acetyl-l-phenylalanine
    synonyms:
    - (2S)-2-azanyl-3-(4-ethanoylphenyl)propanoic acid
    - 4-acetyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 4AF
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C(=O)C'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4AK:
    id: 4AK
    name: n~6~-sulfo-l-lysine
    synonyms:
    - N~6~-sulfo-L-lysine
    - (2S)-2-azanyl-6-(sulfoamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4AK
    structure: '[NH3+][C@H](C(=O)[O-])CCCCNS(=O)(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4AR:
    id: 4AR
    name: amino({(4s)-4-amino-6-[(2,6-dimethylbenzoyl)oxy]-5-oxohexyl}amino)methaniminium
    synonyms:
    - '[azanyl-[[(4S)-4-azanyl-6-(2,6-dimethylphenyl)carbonyloxy-5-oxidanylidene-hexyl]amino]methylidene]azanium'
    - amino({(4S)-4-amino-6-[(2,6-dimethylbenzoyl)oxy]-5-oxohexyl}amino)methaniminium
    identifiers:
    - ns: pdb-ccd
      id: 4AR
    structure: '[NH3+][C@H](C(=O)COC(=O)c1c(C)cccc1C)CCCNC(=[NH2+])N'
    base_monomers:
    - R
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4AW:
    id: 4AW
    name: 4-azatryptophan
    synonyms:
    - 3-(1H-pyrrolo[3,2-b]pyridin-3-yl)-L-alanine
    - (2S)-2-azanyl-3-(1H-pyrrolo[3,2-b]pyridin-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: 4AW
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1nccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  4CF:
    id: 4CF
    name: 4-cyano-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-azanyl-3-(4-cyanophenyl)propanoic acid
    - 4-cyano-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 4CF
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C#N'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4CY:
    id: 4CY
    name: nitrilo-l-methionine
    synonyms:
    - M
    - nitrilo-L-methionine
    - (2S)-2-azanyl-4-thiocyanato-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4CY
    structure: N#CSCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  4D4:
    id: 4D4
    name: (2s,3r)-2-azanyl-5-carbamimidamido-3-oxidanyl-pentanoic acid
    synonyms:
    - (2S,3R)-2-azanyl-5-carbamimidamido-3-oxidanyl-pentanoic acid
    - (2S,3R)-2-amino-5-carbamimidamido-3-hydroxypentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: 4D4
    structure: O[C@@H]([C@@H](C(=O)[O-])[NH3+])CCNC(=[NH2+])N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  4DB:
    id: 4DB
    name: (2s)-2-amino-4-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2h-isoindol-2-yl]butanoic
      acid
    synonyms:
    - (2S)-2-amino-4-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl]butanoic
      acid
    - (2S)-2-azanyl-4-[5-(dimethylamino)-1,3-dioxo-isoindol-2-yl]butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4DB
    structure: '[NH3+][C@H](C(=O)[O-])CCN1C(=O)c2c(C1=O)cc(cc2)N(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4DP:
    id: 4DP
    name: 3-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2h-isoindol-2-yl]-l-alanine
    synonyms:
    - (2S)-2-amino-3-(5-dimethylamino-1,3-dioxo-isoindol-2-yl)propanoic acid
    - 3-[5-(dimethylamino)-1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl]-L-alanine
    - W
    identifiers:
    - ns: pdb-ccd
      id: 4DP
    structure: '[O-]C(=O)[C@H](CN1C(=O)c2c(C1=O)ccc(c2)N(C)C)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  4F3:
    id: 4F3
    name: '[2-(1-amino-2-hydroxy-propyl)-4-(4-fluoro-1h-indol-3-ylmethyl)-5-hydroxy-imidazol-1-yl]-acetic
      acid'
    synonyms:
    - '{2-[(1R,2S)-1-amino-2-hydroxypropyl]-4-[(4-fluoro-1H-indol-3-yl)methyl]-5-hydroxy-1H-imidazol-1-yl}acetic
      acid'
    - GYG
    - 2-[2-[(1R,2S)-1-amino-2-hydroxy-propyl]-4-[(4-fluoro-1H-indol-3-yl)methyl]-5-hydroxy-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4F3
    structure: '[O-]C(=O)Cn1c(O)c(nc1[C@H]([C@@H](O)C)[NH3+])Cc1c[nH]c2c1c(F)ccc2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  4FB:
    id: 4FB
    name: (4s)-4-fluoro-l-proline
    synonyms:
    - P
    - (2S,4S)-4-fluoropyrrolidine-2-carboxylic acid
    - (4S)-4-fluoro-L-proline
    identifiers:
    - ns: pdb-ccd
      id: 4FB
    structure: '[O-]C(=O)[C@@H]1C[C@@H](C[NH2+]1)F'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  4FW:
    id: 4FW
    name: 4-fluorotryptophane
    synonyms:
    - (2S)-2-amino-3-(4-fluoro-1H-indol-3-yl)propanoic acid
    - 4-fluoro-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: 4FW
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1c(F)ccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  4GJ:
    id: 4GJ
    name: 3-(pyridin-4-yldisulfanyl)-l-alanine
    synonyms:
    - (2R)-2-azanyl-3-(pyridin-4-yldisulfanyl)propanoic acid
    - 3-(pyridin-4-yldisulfanyl)-L-alanine
    - C
    identifiers:
    - ns: pdb-ccd
      id: 4GJ
    structure: '[O-]C(=O)[C@H](CSSc1ccncc1)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  4HH:
    id: 4HH
    name: o-[(s)-hydroxy{[(3r)-3-hydroxy-2,2-dimethyl-4-oxo-4-({3-oxo-3-[(2-sulfanylethyl)amino]propyl}amino)butyl]oxy}phosphoryl]-l-serine
    synonyms:
    - O-[(S)-hydroxy{[(3R)-3-hydroxy-2,2-dimethyl-4-oxo-4-({3-oxo-3-[(2-sulfanylethyl)amino]propyl}amino)butyl]oxy}phosphoryl]-L-serine
    - (2S)-2-azanyl-3-[[(3R)-2,2-dimethyl-3-oxidanyl-4-oxidanylidene-4-[[3-oxidanylidene-3-(2-sulfanylethylamino)propyl]amino]butoxy]-oxidanyl-phosphoryl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4HH
    structure: SCCNC(=O)CCNC(=O)[C@@H](C(COP(=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-])(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  4HJ:
    id: 4HJ
    name: o-[(r)-hydroxy{[(3r)-3-hydroxy-4-{[3-({2-[(2-hydroxybenzoyl)sulfanyl]ethyl}amino)-3-oxopropyl]amino}-2,2-dimethyl-4-oxobutyl]oxy}phosphoryl]-l-serine
    synonyms:
    - O-[(R)-hydroxy{[(3R)-3-hydroxy-4-{[3-({2-[(2-hydroxybenzoyl)sulfanyl]ethyl}amino)-3-oxopropyl]amino}-2,2-dimethyl-4-oxobutyl]oxy}phosphoryl]-L-serine
    - (2S)-2-azanyl-3-[[(3R)-4-[[3-[2-(2-hydroxyphenyl)carbonylsulfanylethylamino]-3-oxidanylidene-propyl]amino]-2,2-dimethyl-3-oxidanyl-4-oxidanylidene-butoxy]-oxidanyl-phosphoryl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4HJ
    structure: O=C(NCCSC(=O)c1ccccc1O)CCNC(=O)[C@@H](C(COP(=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-])(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 35
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 34
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 35
    - molecule: Monomer
      element: H
      position: 35
      charge: 1
  4HL:
    id: 4HL
    name: (6e)-4-[(2s)-2-amino-2-carboxyethyl]-6-[2-(4-hydroxybenzyl)hydraziniumylidene]-3-oxocyclohexa-1,4-dien-1-olate
    synonyms:
    - (6E)-4-[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]-6-[(4-hydroxyphenyl)methylamino]azaniumylidene-3-oxidanylidene-cyclohexa-1,4-dien-1-olate
    - (6E)-4-[(2S)-2-amino-2-carboxyethyl]-6-[2-(4-hydroxybenzyl)hydraziniumylidene]-3-oxocyclohexa-1,4-dien-1-olate
    identifiers:
    - ns: pdb-ccd
      id: 4HL
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N\NCc2ccc(cc2)O)/C(=CC1=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4HT:
    id: 4HT
    name: 4-hydroxytryptophan
    synonyms:
    - (2S)-2-amino-3-(4-hydroxy-1H-indol-3-yl)propanoic acid
    - 4-hydroxy-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: 4HT
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1c(O)ccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  4II:
    id: 4II
    name: (2~{s})-2-azanyl-3-(4-azidophenyl)propanoic acid
    synonyms:
    - F
    - (2~{S})-2-azanyl-3-(4-azidophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4II
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)N=[N+]=[N-]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4IK:
    id: 4IK
    name: (2s,5s)-2,6-diamino-5-{[(2r,3s,4r,5r)-5-(6-amino-9h-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl}hexanoic
      acid
    synonyms:
    - (2S,5S)-2,6-diamino-5-{[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl}hexanoic
      acid (non-preferred name)
    - (2S,5S)-5-(aminomethyl)-6-[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]-2-azanyl-hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4IK
    structure: '[NH3+]C[C@H](C[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)CC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 34
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 37
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 36
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    - molecule: Monomer
      element: H
      position: 37
      charge: 1
  4IN:
    id: 4IN
    name: 4-amino-l-tryptophan
    synonyms:
    - 4-amino-L-tryptophan
    - (2S)-2-azanyl-3-(4-azanyl-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: 4IN
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1c(N)ccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  4J4:
    id: 4J4
    name: s-(2-{[(2',4'-difluorobiphenyl-4-yl)methyl]amino}-2-oxoethyl)-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[2-[[4-[2,4-bis(fluoranyl)phenyl]phenyl]methylamino]-2-oxidanylidene-ethyl]sulfanyl-propanoic
      acid
    - S-(2-{[(2',4'-difluorobiphenyl-4-yl)methyl]amino}-2-oxoethyl)-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: 4J4
    structure: O=C(NCc1ccc(cc1)c1ccc(cc1F)F)CSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 27
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    - molecule: Monomer
      element: H
      position: 27
      charge: 1
  4J5:
    id: 4J5
    name: amino{[(3s)-3-amino-3-carboxypropyl]amino}methaniminium
    synonyms:
    - amino{[(3S)-3-amino-3-carboxypropyl]amino}methaniminium
    - '[azanyl-[[(3S)-3-azanyl-4-oxidanyl-4-oxidanylidene-butyl]amino]methylidene]azanium'
    identifiers:
    - ns: pdb-ccd
      id: 4J5
    structure: '[O-]C(=O)[C@H](CCNC(=[NH2+])N)[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  4L0:
    id: 4L0
    name: (4r)-1-acetyl-4-(hexyloxy)-l-proline
    synonyms:
    - (4R)-1-acetyl-4-(hexyloxy)-L-proline
    - (2S,4R)-1-ethanoyl-4-hexoxy-pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 4L0
    structure: CCCCCCO[C@@H]1C[C@H](N(C1)C(=O)C)C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
  4L8:
    id: 4L8
    name: (2r)-2-(aminomethyl)-4-methylpentanoic acid
    synonyms:
    - (2R)-2-(aminomethyl)-4-methylpentanoic acid
    - (2R)-2-(aminomethyl)-4-methyl-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4L8
    structure: '[NH3+]C[C@H](C(=O)[O-])CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4LZ:
    id: 4LZ
    name: o-[2-(triaza-1,2-dien-2-ium-1-yl)ethyl]-l-tyrosine
    synonyms:
    - O-[2-(triaza-1,2-dien-2-ium-1-yl)ethyl]-L-tyrosine
    - azanylidene-[2-[4-[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]phenoxy]ethylimino]azanium
    identifiers:
    - ns: pdb-ccd
      id: 4LZ
    structure: '[N-]=[N+]=NCCOc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  4M8:
    id: 4M8
    name: (2s)-2-amino-4-[(s)-hydroxy(methoxy)phosphoryl]butanoic acid
    synonyms:
    - (2S)-2-azanyl-4-[methoxy(oxidanyl)phosphoryl]butanoic acid
    - (2S)-2-amino-4-[(S)-hydroxy(methoxy)phosphoryl]butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4M8
    structure: COP(=O)(CC[C@@H](C(=O)[O-])[NH3+])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  4N7:
    id: 4N7
    name: 1-[(1z)-3-(4-methylphenyl)-3-oxo-1-phenylprop-1-en-1-yl]-l-proline
    synonyms:
    - 1-[(1Z)-3-(4-methylphenyl)-3-oxo-1-phenylprop-1-en-1-yl]-L-proline
    - (2S)-1-[(Z)-3-(4-methylphenyl)-3-oxidanylidene-1-phenyl-prop-1-enyl]pyrrolidine-2-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4N7
    structure: '[O-]C(=O)[C@@H]1CCCN1/C(=C\C(=O)c1ccc(cc1)C)/c1ccccc1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  4N8:
    id: 4N8
    name: 1-[(furan-2-ylmethyl)carbamothioyl]-l-proline
    synonyms:
    - 1-[(furan-2-ylmethyl)carbamothioyl]-L-proline
    - (2S)-1-(furan-2-ylmethylcarbamothioyl)pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 4N8
    structure: '[O-]C(=O)[C@@H]1CCCN1C(=S)NCc1ccco1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  4N9:
    id: 4N9
    name: 1-[(4-cyanobenzyl)carbamothioyl]-l-proline
    synonyms:
    - 1-[(4-cyanobenzyl)carbamothioyl]-L-proline
    - (2S)-1-[(4-cyanophenyl)methylcarbamothioyl]pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 4N9
    structure: N#Cc1ccc(cc1)CNC(=S)N1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  4NT:
    id: 4NT
    name: '[(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(3-chloro-4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-[(1R,2R)-1-azanyl-2-oxidanyl-propyl]-4-[(3-chloranyl-4-oxidanyl-phenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-(3-chloro-4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: 4NT
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2ccc(c(c2)Cl)O)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  4NU:
    id: 4NU
    name: '{(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(3,5-dichloro-4-oxocyclohexa-2,5-dien-1-yl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-[(1R,2R)-1-azanyl-2-oxidanyl-propyl]-4-[[3,5-bis(chloranyl)-4-oxidanylidene-cyclohexa-2,5-dien-1-yl]methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '{(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-[(3,5-dichloro-4-oxocyclohexa-2,5-dien-1-yl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: 4NU
    structure: '[O-]C(=O)CN1C(=O)/C(=C/[C-]2C=C(Cl)C(=O)C(=C2)Cl)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  4OU:
    id: 4OU
    name: 4-(acryloylamino)-l-phenylalanine
    synonyms:
    - 4-(acryloylamino)-L-phenylalanine
    - (2S)-2-azanyl-3-[4-(prop-2-enoylamino)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4OU
    structure: C=CC(=O)Nc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  4OV:
    id: 4OV
    name: (2r)-2-[(1r)-2-[(2s)-2-amino-2-carboxyethoxy]-1-{[(2r)-2-amino-2-phenylacetyl]amino}-2-oxoethyl]-5-methyl-3,6-dihydro-2h-1,3-thiazine-4-carboxylic
      acid
    synonyms:
    - (2R)-2-[(1R)-2-[(2S)-2-amino-2-carboxyethoxy]-1-{[(2R)-2-amino-2-phenylacetyl]amino}-2-oxoethyl]-5-methyl-3,6-dihydro-2H-1,3-thiazine-4-carboxylic
      acid
    - (2R)-2-[(1R)-2-[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propoxy]-1-[[(2R)-2-azanyl-2-phenyl-ethanoyl]amino]-2-oxidanylidene-ethyl]-5-methyl-3,6-dihydro-2H-1,3-thiazine-4-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 4OV
    structure: '[NH3+][C@H](C(=O)[O-])COC(=O)[C@H]([C@H]1SCC(=C([NH2+]1)C(=O)[O-])C)NC(=O)[C@@H](c1ccccc1)[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4PH:
    id: 4PH
    name: 4-methyl-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-azanyl-3-(4-methylphenyl)propanoic acid
    - 4-methyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 4PH
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  4PQ:
    id: 4PQ
    name: 5-hydroxy-l-tryptophan
    synonyms:
    - (2S)-2-azanyl-3-(5-oxidanyl-1H-indol-3-yl)propanoic acid
    - 5-hydroxy-L-tryptophan
    identifiers:
    - ns: pdb-ccd
      id: 4PQ
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc(O)cc2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  4QK:
    id: 4QK
    name: 6-[4-(2-aminoethyl)-1h-1,2,3-triazol-1-yl]-l-norleucine
    synonyms:
    - (2S)-2-azanyl-6-[4-(2-azanylethyl)-1,2,3-triazol-1-yl]hexanoic acid
    - 6-[4-(2-aminoethyl)-1H-1,2,3-triazol-1-yl]-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: 4QK
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCCn1cc(nn1)CC[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  4SJ:
    id: 4SJ
    name: n,beta,beta-trimethyl-l-phenylalanine
    synonyms:
    - (2S)-3-methyl-2-(methylamino)-3-phenyl-butanoic acid
    - N,beta,beta-trimethyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 4SJ
    structure: '[O-]C(=O)[C@H](C(c1ccccc1)(C)C)[NH2+]C'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  4U7:
    id: 4U7
    name: '[(5s)-5-amino-5-carboxy-6,6-difluorohexyl](trihydroxy)borate(1-)'
    synonyms:
    - A
    - '[(5S)-5-azanyl-5-[bis(fluoranyl)methyl]-6-oxidanyl-6-oxidanylidene-hexyl]-tris(oxidanyl)boranuide'
    - '[(5S)-5-amino-5-carboxy-6,6-difluorohexyl](trihydroxy)borate(1-)'
    identifiers:
    - ns: pdb-ccd
      id: 4U7
    structure: FC([C@@](C(=O)[O-])(CCCC[B-](O)(O)O)[NH3+])F
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  4UD:
    id: 4UD
    name: (2s)-amino[(5s)-4,5-dihydro-1,2-oxazol-5-yl]acetic acid
    synonyms:
    - (2S)-amino[(5S)-4,5-dihydro-1,2-oxazol-5-yl]acetic acid
    - (2S)-2-azanyl-2-[(5S)-4,5-dihydro-1,2-oxazol-5-yl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4UD
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@@H]1CC=NO1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  4WQ:
    id: 4WQ
    name: (2s)-2-amino-7,7-dimethyloctanoic acid
    synonyms:
    - (2S)-2-azanyl-7,7-dimethyl-octanoic acid
    - (2S)-2-amino-7,7-dimethyloctanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 4WQ
    structure: '[O-]C(=O)[C@H](CCCCC(C)(C)C)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  51T:
    id: 51T
    name: 2,3,6-trifluoro-l-tyrosine
    synonyms:
    - 2,3,6-trifluoro-L-tyrosine
    - (2S)-2-azanyl-3-[2,3,6-tris(fluoranyl)-4-oxidanyl-phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 51T
    structure: '[NH3+][C@H](C(=O)[O-])Cc1c(F)cc(c(c1F)F)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  '562':
    id: '562'
    name: n~5~-[n-(2-{2-[2-(triaza-1,2-dien-2-ium-1-yl)ethoxy]ethoxy}ethyl)carbamimidoyl]-l-ornithine
    synonyms:
    - N~5~-[N-(2-{2-[2-(triaza-1,2-dien-2-ium-1-yl)ethoxy]ethoxy}ethyl)carbamimidoyl]-L-ornithine
    - azanylidene-[2-[2-[2-[[N-[(4S)-4-azanyl-5-oxidanyl-5-oxidanylidene-pentyl]carbamimidoyl]amino]ethoxy]ethoxy]ethylimino]azanium
    identifiers:
    - ns: pdb-ccd
      id: '562'
    structure: '[N-]=[N+]=NCCOCCOCCNC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  56A:
    id: 56A
    name: 3-(8-phenyloctyl)-l-histidine
    synonyms:
    - H
    - (2S)-2-azanyl-3-[3-(8-phenyloctyl)imidazol-4-yl]propanoic acid
    - 3-(8-phenyloctyl)-L-histidine
    identifiers:
    - ns: pdb-ccd
      id: 56A
    structure: '[O-]C(=O)[C@H](Cc1cncn1CCCCCCCCc1ccccc1)[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  56C:
    id: 56C
    name: n~5~-{n-[2-(2-{2-[2-(triaza-1,2-dien-2-ium-1-yl)ethoxy]ethoxy}ethoxy)ethyl]carbamimidoyl}-l-ornithine
    synonyms:
    - N~5~-{N-[2-(2-{2-[2-(triaza-1,2-dien-2-ium-1-yl)ethoxy]ethoxy}ethoxy)ethyl]carbamimidoyl}-L-ornithine
    - azanylidene-[2-[2-[2-[2-[[N-[(4S)-4-azanyl-5-oxidanyl-5-oxidanylidene-pentyl]carbamimidoyl]amino]ethoxy]ethoxy]ethoxy]ethylimino]azanium
    identifiers:
    - ns: pdb-ccd
      id: 56C
    structure: '[N-]=[N+]=NCCOCCOCCOCCNC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    - molecule: Monomer
      element: H
      position: 29
      charge: 1
  5AB:
    id: 5AB
    name: '[(5s)-5-amino-5-carboxyhexyl](trihydroxy)borate'
    synonyms:
    - A
    - '[(5S)-5-amino-5-carboxyhexyl](trihydroxy)borate(1-)'
    - '[(5S)-5-azanyl-5-methyl-6-oxidanyl-6-oxidanylidene-hexyl]-tris(oxidanyl)boranuide'
    identifiers:
    - ns: pdb-ccd
      id: 5AB
    structure: '[O-]C(=O)[C@](CCCC[B-](O)(O)O)([NH3+])C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  5CR:
    id: 5CR
    name: n-acetyl-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-acetamido-3-phenyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5CR
    structure: '[O-]C(=O)[C@H](Cc1ccccc1)NC(=O)C'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  5CS:
    id: 5CS
    name: 2-amino-3-(cystein-s-yl)-isoxazolidin-5-yl-acetic acid
    synonyms:
    - S-{(3R,5R)-5-[(S)-amino(carboxy)methyl]isoxazolidin-3-yl}-L-cysteine
    - C
    - (2R)-2-amino-3-[[(3R)-5-[(1S)-1-amino-2-hydroxy-2-oxo-ethyl]-1,2-oxazolidin-3-yl]sulfanyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 5CS
    structure: '[O-]C(=O)[C@H](CS[C@H]1NOC(C1)[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  5CW:
    id: 5CW
    name: 5-chloro-l-tryptophan
    synonyms:
    - (2S)-2-azanyl-3-(5-chloranyl-1H-indol-3-yl)propanoic acid
    - 5-chloro-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: 5CW
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc(Cl)cc2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  5DW:
    id: 5DW
    name: 4-ethynyl-l-phenylalanine
    synonyms:
    - 4-ethynyl-L-phenylalanine
    - (2S)-2-azanyl-3-(4-ethynylphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5DW
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C#C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  5FQ:
    id: 5FQ
    name: n-pentyl-l-alaninamide
    synonyms:
    - (2S)-2-azanyl-N-pentyl-propanamide
    - N-pentyl-L-alaninamide
    identifiers:
    - ns: pdb-ccd
      id: 5FQ
    structure: CCCCCNC(=O)[C@@H]([NH3+])C
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  5GM:
    id: 5GM
    name: (4s)-2,4-dimethyl-l-norleucine
    synonyms:
    - (4S)-2,4-dimethyl-L-norleucine
    - (2S,4S)-2-azanyl-2,4-dimethyl-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5GM
    structure: CC[C@@H](C[C@@](C(=O)[O-])([NH3+])C)C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  5MW:
    id: 5MW
    name: (2~{s})-5-[4-(aminomethyl)-1,2,3-triazol-1-yl]-2-azanyl-pentanoic acid
    synonyms:
    - (2~{S})-5-[4-(aminomethyl)-1,2,3-triazol-1-yl]-2-azanyl-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5MW
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCn1cc(nn1)C[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  5OH:
    id: 5OH
    name: (2s)-amino[(4r,6s)-2-amino-6-hydroxy-3,4,5,6-tetrahydropyrimidin-4-yl]ethanoic
      acid
    synonyms:
    - (2S)-2-azanyl-2-[(4S,6R)-2-azanyl-4-hydroxy-1,4,5,6-tetrahydropyrimidin-6-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 5OH
    structure: '[O-]C(=O)[C@H]([C@H]1C[C@H](O)[NH+]=C(N1)N)N'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  5OL:
    id: 5OL
    name: n~6~-(1,1-dihydroxyethyl)-l-lysine
    synonyms:
    - N~6~-(1,1-dihydroxyethyl)-L-lysine
    - (2~{S})-2-azanyl-6-[1,1-bis(oxidanyl)ethylamino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5OL
    structure: '[NH3+][C@H](C(=O)[O-])CCCC[NH2+]C(O)(O)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  5OM:
    id: 5OM
    name: (2s)-2-amino-8,8-dihydroxy-8-[(2s)-oxiran-2-yl]octanoic acid
    synonyms:
    - (2S)-2-amino-8,8-dihydroxy-8-[(2S)-oxiran-2-yl]octanoic acid
    - (2~{S})-2-azanyl-8,8-bis(oxidanyl)-8-[(2~{S})-oxiran-2-yl]octanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5OM
    structure: '[NH3+][C@H](C(=O)[O-])CCCCCC([C@H]1OC1)(O)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  5OW:
    id: 5OW
    name: (2~{s})-2-azanyl-6-[[(~{z})-~{c}-[2-methyl-3-oxidanyl-5-(phosphonooxymethyl)pyridin-4-yl]-~{n}-[(2~{r})-1-oxidanyl-1-oxidanylidene-3-sulfanyl-propan-2-yl]carbonimidoyl]amino]hexanoic
      acid
    synonyms:
    - (2~{S})-2-azanyl-6-[[(~{Z})-~{C}-[2-methyl-3-oxidanyl-5-(phosphonooxymethyl)pyridin-4-yl]-~{N}-[(2~{R})-1-oxidanyl-1-oxidanylidene-3-sulfanyl-propan-2-yl]carbonimidoyl]amino]hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: 5OW
    structure: SC[C@@H](C(=O)[O-])/N=C(/c1c(cnc(c1O)C)COP(=O)([O-])[O-])\NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
  5PG:
    id: 5PG
    name: (2s)-(4-hydroxyphenyl)(methylamino)ethanoic acid
    synonyms:
    - (2S)-(4-hydroxyphenyl)(methylamino)ethanoic acid
    - (2S)-2-(4-hydroxyphenyl)-2-methylamino-ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 5PG
    structure: '[O-]C(=O)[C@H](c1ccc(cc1)O)[NH2+]C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  5R5:
    id: 5R5
    name: methyl (2~{s})-2-azanyl-3-oxidanyl-propanoate
    synonyms:
    - methyl (2~{S})-2-azanyl-3-oxidanyl-propanoate
    identifiers:
    - ns: pdb-ccd
      id: 5R5
    structure: COC(=O)[C@H](CO)N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  5SQ:
    id: 5SQ
    name: 2-[2-[(1~{s})-1-azanyl-2-(1~{h}-imidazol-4-yl)ethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    synonyms:
    - 2-[2-[(1~{S})-1-azanyl-2-(1~{H}-imidazol-4-yl)ethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - HYG
    identifiers:
    - ns: pdb-ccd
      id: 5SQ
    structure: '[O-]C(=O)CN1C(=O)C(=Cc2ccc(cc2)O)N=C1[C@H](Cc1c[nH]cn1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  5VV:
    id: 5VV
    name: n-carbamoyl-l-asparagine
    synonyms:
    - N
    - '[(2~{S})-4-azanyl-1,4-bis(oxidanylidene)butan-2-yl]carbamic acid'
    identifiers:
    - ns: pdb-ccd
      id: 5VV
    structure: NC(=O)C[C@@H](C(=O)[O-])NC(=O)[O-]
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  5X8:
    id: 5X8
    name: s-adenosyl-l-cysteine
    synonyms:
    - (2~{R})-3-[[(2~{S},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methylsulfanyl]-2-azanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 5X8
    structure: '[O-]C(=O)[C@H](CSC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  5XU:
    id: 5XU
    name: (2~{s})-2-azanylpropanal
    synonyms:
    - (2~{S})-2-azanylpropanal
    identifiers:
    - ns: pdb-ccd
      id: 5XU
    structure: '[O-]C(=O)[C@@H]([NH3+])C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  5ZA:
    id: 5ZA
    name: (5z)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-5-[(4-amino-1h-indol-3-yl)methylene]-3-(2-hydroxyethyl)-3,5-dihydro-4h-imidazol-4-one
    synonyms:
    - 2-[(4Z)-2-[(1R,2R)-1-amino-2-hydroxy-propyl]-4-[(4-amino-1H-indol-3-yl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - '{(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-[(4-amino-1H-indol-3-yl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - TWG
    identifiers:
    - ns: pdb-ccd
      id: 5ZA
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2c[nH]c3c2c(N)ccc3)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  60F:
    id: 60F
    name: (2~{r})-2-azanyl-3-[(~{e})-3-(4-hydroxyphenyl)prop-2-enoyl]sulfanyl-propanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-3-[(~{E})-3-(4-hydroxyphenyl)prop-2-enoyl]sulfanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 60F
    structure: '[NH3+][C@H](C(=O)[O-])CSC(=O)/C=C/c1ccc(cc1)O'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  62H:
    id: 62H
    name: (2s)-3-amino-2-methylpropanoic acid
    synonyms:
    - (2~{S})-3-azanyl-2-methyl-propanoic acid
    - (2S)-3-amino-2-methylpropanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 62H
    structure: '[O-]C(=O)[C@H](C[NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  66C:
    id: 66C
    name: 4-[8-(beta-alanyl)-8,9-dihydro-1h-dibenzo[b,f][1,2,3]triazolo[4,5-d]azocin-1-yl]-l-phenylalanine
    synonyms:
    - 4-[8-(beta-alanyl)-8,9-dihydro-1H-dibenzo[b,f][1,2,3]triazolo[4,5-d]azocin-1-yl]-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 66C
    structure: '[NH3+]CCC(=O)N1Cc2ccccc2c2c(c3c1cccc3)nnn2c1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 37
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 40
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 39
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 40
    - molecule: Monomer
      element: H
      position: 40
      charge: 1
  66D:
    id: 66D
    name: (4r)-2,4-dimethyl-l-norleucine
    synonyms:
    - (4R)-2,4-dimethyl-L-norleucine
    - (2~{S},4~{R})-2-azanyl-2,4-dimethyl-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 66D
    structure: CC[C@H](C[C@@](C(=O)[O-])([NH3+])C)C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  66E:
    id: 66E
    name: n-ethyl-l-valine
    synonyms:
    - (2~{S})-2-(ethylamino)-3-methyl-butanoic acid
    - N-ethyl-L-valine
    identifiers:
    - ns: pdb-ccd
      id: 66E
    structure: CC[NH2+][C@H](C(=O)[O-])C(C)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
    - molecule: Monomer
      element: H
      position: 3
      charge: 1
  6CL:
    id: 6CL
    name: 6-carboxylysine
    synonyms:
    - '[(2R,6S)-6-amino-1,7-dihydroxy-1,7-dioxo-heptan-2-yl]azanium'
    - K
    - (1R,5S)-5-amino-1,5-dicarboxypentan-1-aminium
    identifiers:
    - ns: pdb-ccd
      id: 6CL
    structure: '[NH3+][C@H](C(=O)[O-])CCC[C@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  6CV:
    id: 6CV
    name: 3-bromo-l-phenylalanine
    synonyms:
    - (2~{S})-2-azanyl-3-(3-bromophenyl)propanoic acid
    - 3-bromo-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 6CV
    structure: '[O-]C(=O)[C@H](Cc1cccc(c1)Br)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  6DU:
    id: 6DU
    name: 2-bromo-l-phenylalanine
    synonyms:
    - (2~{S})-2-azanyl-3-(2-bromophenyl)propanoic acid
    - 2-bromo-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: 6DU
    structure: '[O-]C(=O)[C@H](Cc1ccccc1Br)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  6FL:
    id: 6FL
    name: 5,5,5,5',5',5'-hexafluoro-l-leucine
    synonyms:
    - (2S)-2-azanyl-5,5,5-tris(fluoranyl)-4-(trifluoromethyl)pentanoic acid
    - 5,5,5,5',5',5'-hexafluoro-L-leucine
    identifiers:
    - ns: pdb-ccd
      id: 6FL
    structure: '[O-]C(=O)[C@H](CC(C(F)(F)F)C(F)(F)F)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  6GL:
    id: 6GL
    name: 5-(phosphonooxy)-l-norvaline
    synonyms:
    - A
    - (2S)-2-azanyl-5-phosphonooxy-pentanoic acid
    - 5-(phosphonooxy)-L-norvaline
    identifiers:
    - ns: pdb-ccd
      id: 6GL
    structure: '[O-]C(=O)[C@H](CCCOP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  6HN:
    id: 6HN
    name: 6-nitro-l-norleucine
    synonyms:
    - 6-nitro-L-norleucine
    - (2S)-2-amino-6-nitro-hexanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: 6HN
    structure: '[O-][N+](=O)CCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  6KM:
    id: 6KM
    name: s-propanoyl-l-cysteine
    synonyms:
    - (2~{R})-2-azanyl-3-propanoylsulfanyl-propanoic acid
    - S-propanoyl-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: 6KM
    structure: '[O-]C(=O)[C@@H]([NH3+])CSC(=O)CC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  6KY:
    id: 6KY
    name: (2s)-2-(dimethylamino)-4-(methylselanyl)butanoic acid
    synonyms:
    - (2~{S})-2-(dimethylamino)-4-methylselanyl-butanoic acid
    - (2S)-2-(dimethylamino)-4-(methylselanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 6KY
    structure: C[Se]CC[C@H]([NH+](C)C)C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
  6M6:
    id: 6M6
    name: s-[(2-phenylethyl)carbamothioyl]-l-cysteine
    synonyms:
    - (2~{R})-2-azanyl-3-(2-phenylethylcarbamothioylsulfanyl)propanoic acid
    - S-[(2-phenylethyl)carbamothioyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: 6M6
    structure: '[NH3+][C@H](C(=O)[O-])CSC(=S)[N-]CCc1ccccc1'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  6RK:
    id: 6RK
    name: 4-azanylcyclohexane-1-carboxylic acid
    synonyms:
    - 4-azanylcyclohexane-1-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 6RK
    structure: '[NH3+]C1CCC(CC1)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  6V1:
    id: 6V1
    name: (2~{r})-2-azanyl-3-[(3~{r})-1-ethyl-2,5-bis(oxidanylidene)pyrrolidin-3-yl]sulfanyl-propanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-3-[(3~{R})-1-ethyl-2,5-bis(oxidanylidene)pyrrolidin-3-yl]sulfanyl-propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 6V1
    structure: '[O-]C(=O)[C@@H]([NH3+])CS[C@@H]1CC(=O)N(C1=O)CC'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  6WK:
    id: 6WK
    name: (2~{r})-2-azanyl-3-[[(2~{s},3~{s})-2,3-bis(oxidanyl)-4-sulfanyl-butyl]disulfanyl]propanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-3-[[(2~{S},3~{S})-2,3-bis(oxidanyl)-4-sulfanyl-butyl]disulfanyl]propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 6WK
    structure: SC[C@H]([C@@H](CSSC[C@@H](C(=O)[O-])[NH3+])O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  6ZS:
    id: 6ZS
    name: l-isovaline
    synonyms:
    - (2~{S})-2-azanyl-2-methyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 6ZS
    structure: '[O-]C(=O)[C@@]([NH3+])(CC)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  73C:
    id: 73C
    name: (2~{s})-2-azanyl-3-butoxy-propanoic acid
    synonyms:
    - (2~{S})-2-azanyl-3-butoxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 73C
    structure: CCCCOC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  73N:
    id: 73N
    name: (2~{s})-5-carbamimidamido-2-(carboxyamino)pentanoic acid
    synonyms:
    - (2~{S})-5-carbamimidamido-2-(carboxyamino)pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: 73N
    structure: '[O-]C(=O)N[C@H](C(=O)[O-])CCCNC(=[NH2+])N'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  73O:
    id: 73O
    name: (2~{s})-2-azanyl-4-(4-hydroxyphenyl)butanoic acid
    synonyms:
    - (2~{S})-2-azanyl-4-(4-hydroxyphenyl)butanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: 73O
    structure: '[NH3+][C@H](C(=O)[O-])CCc1ccc(cc1)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  73P:
    id: 73P
    name: (2~{s})-6-azanyl-2-(carboxyamino)hexanoic acid
    synonyms:
    - (2~{S})-6-azanyl-2-(carboxyamino)hexanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: 73P
    structure: '[O-]C(=O)[C@@H](NC(=O)[O-])CCCC[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  74P:
    id: 74P
    name: (e)-n~6~-(1-carboxy-3-oxobutylidene)-l-lysine
    synonyms:
    - (2~{S})-2-azanyl-6-[(~{E})-[1-oxidanyl-1,4-bis(oxidanylidene)pentan-2-ylidene]amino]hexanoic
      acid
    - (E)-N~6~-(1-carboxy-3-oxobutylidene)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 74P
    structure: CC(=O)C/C(=[NH+]\CCCC[C@@H](C(=O)[O-])[NH3+])/C(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  7C9:
    id: 7C9
    name: o-methyl-l-serine
    synonyms:
    - O-methyl-L-serine
    - (2~{S})-2-azanyl-3-methoxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 7C9
    structure: '[O-]C(=O)[C@@H]([NH3+])COC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  7CC:
    id: 7CC
    name: n,n-diethyl-l-asparagine
    synonyms:
    - N,N-diethyl-L-asparagine
    - (2~{S})-2-azanyl-4-(diethylamino)-4-oxidanylidene-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 7CC
    structure: CCN(C(=O)C[C@@H](C(=O)[O-])[NH3+])CC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  7HA:
    id: 7HA
    name: n-(3-{[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)-n-(methoxycarbonyl)glycine
    synonyms:
    - 2-[[3-[[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy]phenyl]methyl-methoxycarbonyl-amino]ethanoic
      acid
    - N-(3-{[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)-N-(methoxycarbonyl)glycine
    identifiers:
    - ns: pdb-ccd
      id: 7HA
    structure: COC(=O)N(Cc1cccc(c1)OCc1nc(oc1C)c1ccc(cc1)Cl)CC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 29
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  7JA:
    id: 7JA
    name: n-({(1r,2s)-3-oxo-2-[(2z)-pent-2-en-1-yl]cyclopentyl}acetyl)-l-isoleucine
    synonyms:
    - N-({(1R,2S)-3-oxo-2-[(2Z)-pent-2-en-1-yl]cyclopentyl}acetyl)-L-isoleucine
    - (2S,3S)-3-methyl-2-[2-[(1R,2S)-3-oxo-2-[(Z)-pent-2-enyl]cyclopentyl]ethanoylamino]pentanoic
      acid
    - I
    identifiers:
    - ns: pdb-ccd
      id: 7JA
    structure: CC/C=C\C[C@H]1[C@H](CCC1=O)CC(=O)N[C@@H]([C@H](CC)C)C(=O)[O-]
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  7N8:
    id: 7N8
    name: 4-borono-l-phenylalanine
    synonyms:
    - F
    - (2~{S})-2-azanyl-3-[4-(dihydroxyboranyl)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 7N8
    structure: OB(c1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  81R:
    id: 81R
    name: (4r)-4,5-disulfanyl-l-norvaline
    synonyms:
    - (4R)-4,5-disulfanyl-L-norvaline
    - (2S,4R)-2-azanyl-4,5-bis(sulfanyl)pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 81R
    structure: SC[C@@H](C[C@@H](C(=O)[O-])[NH3+])S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  81S:
    id: 81S
    name: (4s)-4,5-disulfanyl-l-norvaline
    synonyms:
    - (4S)-4,5-disulfanyl-L-norvaline
    - (2S,4S)-2-azanyl-4,5-bis(sulfanyl)pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 81S
    structure: SC[C@H](C[C@@H](C(=O)[O-])[NH3+])S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  '823':
    id: '823'
    name: n,n-bis(3-sulfanylpropyl)-l-asparagine
    synonyms:
    - (2S)-2-azanyl-4-[bis(3-sulfanylpropyl)amino]-4-oxidanylidene-butanoic acid
    - N,N-bis(3-sulfanylpropyl)-L-asparagine
    identifiers:
    - ns: pdb-ccd
      id: '823'
    structure: SCCCN(C(=O)C[C@@H](C(=O)[O-])[NH3+])CCCS
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  85F:
    id: 85F
    name: (2r)-2-azanyl-3-[(2r)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]sulfanyl-propanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-3-[(2~{R})-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]sulfanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 85F
    structure: '[NH3+][C@H](C(=O)[O-])CSC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  85G:
    id: 85G
    name: n-ethyl-l-glutamine
    synonyms:
    - N-ethyl-L-glutamine
    - (2~{S})-2-azanyl-5-(ethylamino)-5-oxidanylidene-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 85G
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC(=O)NCC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  85J:
    id: 85J
    name: n-propyl-l-glutamine
    synonyms:
    - N-propyl-L-glutamine
    - (2~{S})-2-azanyl-5-oxidanylidene-5-(propylamino)pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 85J
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC(=O)NCCC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  8JB:
    id: 8JB
    name: (2~{r})-2-azanyl-3-[[(5~{s})-5-[(1~{s})-1-azanyl-2-oxidanyl-2-oxidanylidene-ethyl]-4,5-dihydro-1,2-oxazol-3-yl]sulfanyl]propanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-3-[[(5~{S})-5-[(1~{S})-1-azanyl-2-oxidanyl-2-oxidanylidene-ethyl]-4,5-dihydro-1,2-oxazol-3-yl]sulfanyl]propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: 8JB
    structure: '[O-]C(=O)[C@H](CSC1=NO[C@@H](C1)[C@@H](C(=O)[O-])[NH3+])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  8LJ:
    id: 8LJ
    name: (2s)-2,3-dihydro-1h-pyrrole-2-carboxylic acid
    synonyms:
    - (2S)-2,3-dihydro-1H-pyrrole-2-carboxylic acid
    - (2~{S})-2,3-dihydro-1~{H}-pyrrole-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: 8LJ
    structure: '[O-]C(=O)[C@@H]1CC=C[NH2+]1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  8RE:
    id: 8RE
    name: 3,4-dihydroxylysine
    synonyms:
    - (2~{S},3~{R},4~{S})-2,6-bis(azanyl)-3,4-bis(oxidanyl)hexanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: 8RE
    structure: '[NH3+]CC[C@@H]([C@@H]([C@@H](C(=O)[O-])[NH3+])O)O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  8SP:
    id: 8SP
    name: o-[(r)-{[(2r)-2,3-bis(octanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-l-serine
    synonyms:
    - O-[(R)-{[(2R)-2,3-bis(octanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
    - (2S)-2-azanyl-3-[[(2R)-2,3-di(octanoyloxy)propoxy]-oxidanyl-phosphoryl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 8SP
    structure: CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC)COP(=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 35
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 34
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 35
    - molecule: Monomer
      element: H
      position: 35
      charge: 1
  8WY:
    id: 8WY
    name: 5,5-dihydroxy-l-norleucine
    synonyms:
    - 5,5-dihydroxy-L-norleucine
    - (2~{S})-2-azanyl-5,5-bis(oxidanyl)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 8WY
    structure: '[NH3+][C@H](C(=O)[O-])CCC(O)(O)C'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  8YR:
    id: 8YR
    name: (2s)-2-azanyl-2-[(3r)-oxolan-3-yl]ethanoic acid
    synonyms:
    - (2~{S})-2-azanyl-2-[(3~{R})-oxolan-3-yl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 8YR
    structure: '[O-]C(=O)[C@H]([C@@H]1COCC1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  9DN:
    id: 9DN
    name: dansyl-l-asparagine
    synonyms:
    - N
    - (2S)-4-amino-2-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]-4-oxo-butanoic
      acid
    - N~2~-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-asparagine
    identifiers:
    - ns: pdb-ccd
      id: 9DN
    structure: NC(=O)C[C@@H](C(=O)[O-])NS(=O)(=O)c1cccc2c1cccc2N(C)C
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  '9E7':
    id: '9E7'
    name: n~6~-(sulfanylmethyl)-l-lysine
    synonyms:
    - N~6~-(sulfanylmethyl)-L-lysine
    - (2~{S})-2-azanyl-6-(sulfanylmethylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: '9E7'
    structure: SC[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  9EV:
    id: 9EV
    name: 6-[(2r)-2-{3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}-5-oxo-1,3-oxazolidin-3-yl]-l-norleucine
    synonyms:
    - (2~{S})-2-azanyl-6-[(2~{R})-2-[2-methyl-3-oxidanyl-5-(phosphonooxymethyl)pyridin-4-yl]-5-oxidanylidene-1,3-oxazolidin-3-yl]hexanoic
      acid
    - 6-[(2R)-2-{3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}-5-oxo-1,3-oxazolidin-3-yl]-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: 9EV
    structure: O=C1CN([C@H](O1)c1c(cnc(c1O)C)COP(=O)([O-])[O-])CCCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  9KK:
    id: 9KK
    name: n-methyl norleucine
    synonyms:
    - (2~{S})-2-(methylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 9KK
    structure: CCCC[C@@H](C(=O)[O-])[NH2+]C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  9MN:
    id: 9MN
    name: (2~{s})-2-azanyl-6-(6-bromanylhexanoylamino)hexanoic acid
    synonyms:
    - (2~{S})-2-azanyl-6-(6-bromanylhexanoylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 9MN
    structure: BrCCCCCC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  9NE:
    id: 9NE
    name: dansyl-l-glutamate
    synonyms:
    - E
    - N-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-glutamic acid
    - (2S)-2-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]pentanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: 9NE
    structure: '[O-]C(=O)CC[C@@H](C(=O)[O-])NS(=O)(=O)c1cccc2c1cccc2N(C)C'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  9NF:
    id: 9NF
    name: dansyl-l-phenylalanine
    synonyms:
    - F
    - N-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-phenylalanine
    - (2S)-2-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]-3-phenyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 9NF
    structure: '[O-]C(=O)[C@@H](NS(=O)(=O)c1cccc2c1cccc2N(C)C)Cc1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  9NR:
    id: 9NR
    name: dansyl-l-arginine
    synonyms:
    - (2S)-5-carbamimidamido-2-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]pentanoic
      acid
    - R
    - N~2~-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-arginine
    identifiers:
    - ns: pdb-ccd
      id: 9NR
    structure: '[O-]C(=O)[C@@H](NS(=O)(=O)c1cccc2c1cccc2N(C)C)CCCNC(=[NH2+])N'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  9NV:
    id: 9NV
    name: dansyl-l-norvaline
    synonyms:
    - V
    - N-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-norvaline
    - (2S)-2-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 9NV
    structure: CCC[C@@H](C(=O)[O-])NS(=O)(=O)c1cccc2c1cccc2N(C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  9R1:
    id: 9R1
    name: (2s)-2-aminooctanedioic acid
    synonyms:
    - (2S)-2-aminooctanedioic acid
    - (2~{S})-2-azanyloctanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: 9R1
    structure: '[O-]C(=O)CCCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  9R4:
    id: 9R4
    name: d-gamma-glutamyl-2-methyl-l-alanine
    synonyms:
    - D-gamma-glutamyl-2-methyl-L-alanine
    - (2~{R})-2-azanyl-5-[(2-methyl-1-oxidanyl-1-oxidanylidene-propan-2-yl)amino]-5-oxidanylidene-pentanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 9R4
    structure: O=C(NC(C(=O)[O-])(C)C)CC[C@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  9R7:
    id: 9R7
    name: l-gamma-glutamylglycine
    synonyms:
    - (2~{S})-2-azanyl-5-(2-hydroxy-2-oxoethylamino)-5-oxidanylidene-pentanoic acid
    - L-gamma-glutamylglycine
    identifiers:
    - ns: pdb-ccd
      id: 9R7
    structure: O=C(CC[C@@H](C(=O)[O-])[NH3+])NCC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  9WV:
    id: 9WV
    name: beta-alanyl-3-amino-l-alanine
    synonyms:
    - beta-alanyl-3-amino-L-alanine
    - (2~{S})-3-azanyl-2-(3-azanylpropanoylamino)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: 9WV
    structure: '[NH3+]CCC(=O)N[C@H](C(=O)[O-])C[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  A5N:
    id: A5N
    name: o-carboxy-4-imino-l-homoserine
    synonyms:
    - N
    - O-carboxy-4-imino-L-homoserine
    - (2S)-2-amino-4-carboxyoxy-4-imino-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: A5N
    structure: '[O-]C(=O)OC(=N)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  A66:
    id: A66
    name: 2-aminoethyllysine-carbonylmethylene-adenine
    synonyms:
    - N~2~-(2-aminoethyl)-N~2~-[(6-amino-9H-purin-9-yl)acetyl]-D-lysine
    - (2R)-6-amino-2-[2-aminoethyl-[2-(6-aminopurin-9-yl)ethanoyl]amino]hexanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: A66
    structure: '[NH3+]CCN([C@@H](C(=O)[O-])CCCC[NH3+])C(=O)Cn1cnc2c1ncnc2N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  A8E:
    id: A8E
    name: (2s)-2-amino-4-bromopent-4-enoic acid
    synonyms:
    - (2S)-2-amino-4-bromopent-4-enoic acid
    - (2S)-2-azanyl-4-bromanyl-pent-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: A8E
    structure: BrC(=C)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  AA4:
    id: AA4
    name: 2-amino-5-hydroxypentanoic acid
    synonyms:
    - A
    - (2S)-2-amino-5-hydroxy-pentanoic acid
    - 5-hydroxy-L-norvaline
    identifiers:
    - ns: pdb-ccd
      id: AA4
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCO'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AA6:
    id: AA6
    name: 3-[4,5-dihydroxy-2-2-(2-hydroxyethylamino)-phenyl]-2-methylamino-propionic
      acid
    synonyms:
    - (2S)-3-[4,5-dihydroxy-2-(hydroxymethylamino)phenyl]-2-(methylamino)propanoic
      acid
    - 3-hydroxy-6-[(hydroxymethyl)amino]-N-methyl-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: AA6
    structure: OCNc1cc(O)c(cc1C[C@@H](C(=O)[O-])[NH2+]C)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  ADD:
    id: ADD
    name: 2,6,8-trimethyl-3-amino-9-benzyl-9-methoxynonanoic acid
    synonyms:
    - (2S,3S,8S,9S)-3-amino-9-methoxy-2,6,8-trimethyl-10-phenyl-decanoic acid
    - X
    - (2S,3S,6R,8S,9S)-3-amino-9-methoxy-2,6,8-trimethyl-10-phenyldecanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ADD
    structure: CO[C@H]([C@H](CC(CC[C@@H]([C@@H](C(=O)[O-])C)[NH3+])C)C)Cc1ccccc1
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  AE5:
    id: AE5
    name: n-[(2s)-2-amino-2-carboxyethyl]-l-glutamic acid
    synonyms:
    - N-[(2S)-2-amino-2-carboxyethyl]-L-glutamic acid
    - (2S)-2-[[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]amino]pentanedioic
      acid
    identifiers:
    - ns: pdb-ccd
      id: AE5
    structure: '[O-]C(=O)CC[C@@H](C(=O)[O-])[NH2+]C[C@@H](C(=O)[O-])N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AEA:
    id: AEA
    name: (2-amino-2-carbamoyl-ethylsulfanyl)-acetic acid
    synonyms:
    - 2-[(2S)-2,3-bis(azanyl)-3-oxidanylidene-propyl]sulfanylethanoic acid
    - '{[(2S)-2,3-diamino-3-oxopropyl]sulfanyl}acetic acid'
    - C
    identifiers:
    - ns: pdb-ccd
      id: AEA
    structure: '[O-]C(=O)CSC[C@H](C(=O)N)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  AFA:
    id: AFA
    name: n-[7-methyl-oct-2,4-dienoyl]asparagine
    synonyms:
    - N
    - N~2~-[(2Z,4E)-7-methylocta-2,4-dienoyl]-L-asparagine
    - (2S)-4-amino-2-[[(2Z,4E)-7-methylocta-2,4-dienoyl]amino]-4-oxo-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: AFA
    structure: CC(C/C=C/C=C\C(=O)N[C@H](C(=O)[O-])CC(=O)N)C
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  AGQ:
    id: AGQ
    name: 3-[(3e)-3-(carbamimidoylhydrazono)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[(3E)-3-(carbamimidoylhydrazinylidene)-4-hydroxy-6-oxo-cyclohexa-1,4-dien-1-yl]propanoic
      acid
    - 3-[(3E)-3-(2-carbamimidoylhydrazinylidene)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: AGQ
    structure: '[O-]C(=O)[C@H](CC1=C/C(=N\NC(=[NH2+])N)/C(=CC1=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  AGT:
    id: AGT
    name: s-{(s)-amino[(4-aminobutyl)amino]methyl}-l-cysteine
    synonyms:
    - S-{(S)-amino[(4-aminobutyl)amino]methyl}-L-cysteine
    - C
    - (2R)-2-azanyl-3-[(S)-azanyl-(4-azanylbutylamino)methyl]sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: AGT
    structure: '[NH3+]CCCCN[C@@H](SC[C@@H](C(=O)[O-])[NH3+])N'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  AHH:
    id: AHH
    name: amino-hydroxyheptanoic acid
    synonyms:
    - (2S,3R)-3-amino-2-hydroxyheptanoic acid
    - (2S,3R)-3-amino-2-hydroxy-heptanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: AHH
    structure: '[O-]C(=O)[C@H]([C@H]([NH3+])CCCC)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  AHO:
    id: AHO
    name: n-acetyl-n-hydroxy-l-ornithine
    synonyms:
    - A
    - (2S)-2-amino-5-(ethanoyl-hydroxy-amino)pentanoic acid
    - N~5~-acetyl-N~5~-hydroxy-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: AHO
    structure: '[NH3+][C@H](C(=O)[O-])CCCN(C(=O)C)O'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AHP:
    id: AHP
    name: 2-amino-heptanoic acid
    synonyms:
    - A
    - (2S)-2-aminoheptanoic acid
    identifiers:
    - ns: pdb-ccd
      id: AHP
    structure: CCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AIB:
    id: AIB
    name: alpha-aminoisobutyric acid
    synonyms:
    - A
    - 2-methyl-L-alanine
    - 2-amino-2-methyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: AIB
    structure: '[O-]C(=O)C([NH3+])(C)C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  AJE:
    id: AJE
    name: (3s,4r)-4-amino-1-(3-carboxypropanoyl)pyrrolidine-3-carboxylic acid
    synonyms:
    - (3S,4R)-4-azanyl-1-(4-oxidanyl-4-oxidanylidene-butanoyl)pyrrolidine-3-carboxylic
      acid
    - (3S,4R)-4-amino-1-(3-carboxypropanoyl)pyrrolidine-3-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: AJE
    structure: '[O-]C(=O)CCC(=O)N1C[C@@H]([C@H](C1)C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  ALC:
    id: ALC
    name: 2-amino-3-cyclohexyl-propionic acid
    synonyms:
    - A
    - 3-cyclohexyl-L-alanine
    - (2S)-2-amino-3-cyclohexyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ALC
    structure: '[NH3+][C@H](C(=O)[O-])CC1CCCCC1'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  ALN:
    id: ALN
    name: naphthalen-2-yl-3-alanine
    synonyms:
    - A
    - (2S)-2-amino-3-naphthalen-1-yl-propanoic acid
    - (2S)-2-amino-3-naphthalen-1-ylpropanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: ALN
    structure: '[O-]C(=O)[C@H](Cc1cccc2c1cccc2)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  ALO:
    id: ALO
    name: allo-threonine
    synonyms:
    - (2S,3S)-2-amino-3-hydroxy-butanoic acid
    - L-allothreonine
    - T
    identifiers:
    - ns: pdb-ccd
      id: ALO
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@@H](O)C'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  ALS:
    id: ALS
    name: (3s)-3-(sulfooxy)-l-serine
    synonyms:
    - A
    - (2S,3S)-2-azanyl-3-oxidanyl-3-sulfooxy-propanoic acid
    - (3S)-3-(sulfooxy)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: ALS
    structure: '[O-]C(=O)[C@H]([C@H](OS(=O)(=O)[O-])O)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  ALT:
    id: ALT
    name: thioalanine
    synonyms:
    - A
    - (2S)-2-aminopropanethioic O-acid
    identifiers:
    - ns: pdb-ccd
      id: ALT
    structure: '[O-]C(=S)[C@@H]([NH3+])C'
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AN6:
    id: AN6
    name: 5'-{[(3s)-3-amino-3-carboxypropyl](ethyl)amino}-5'-deoxyadenosine
    synonyms:
    - (2S)-4-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl-ethyl-amino]-2-azanyl-butanoic
      acid
    - 5'-{[(3S)-3-amino-3-carboxypropyl](ethyl)amino}-5'-deoxyadenosine
    identifiers:
    - ns: pdb-ccd
      id: AN6
    structure: CC[NH+](C[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)CC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 34
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 34
    - molecule: Monomer
      element: H
      position: 34
      charge: 1
  AN8:
    id: AN8
    name: (2s)-2-aminononanoic acid
    synonyms:
    - A
    - (2S)-2-aminononanoic acid
    - (2S)-2-azanylnonanoic acid
    identifiers:
    - ns: pdb-ccd
      id: AN8
    structure: CCCCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  API:
    id: API
    name: 2,6-diaminopimelic acid
    synonyms:
    - (2S,6R)-2,6-bis(azanyl)heptanedioic acid
    - (2R,6S)-2,6-diaminoheptanedioic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: API
    structure: '[NH3+][C@H](C(=O)[O-])CCC[C@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  APK:
    id: APK
    name: 5'-o-[(s)-{[(5s)-5-amino-6-oxohexyl]amino}(hydroxy)phosphoryl]adenosine
    synonyms:
    - N-[(5S)-5-amino-6-oxo-hexyl]-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy]phosphonamidic
      acid
    - K
    - 5'-O-[(S)-{[(5S)-5-amino-6-oxohexyl]amino}(hydroxy)phosphoryl]adenosine
    identifiers:
    - ns: pdb-ccd
      id: APK
    structure: '[O-]C(=O)[C@H](CCCCNP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 37
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    - molecule: Monomer
      element: H
      position: 37
      charge: 1
  APM:
    id: APM
    name: m-amidinophenyl-3-alanine
    synonyms:
    - 3-carbamimidoyl-L-phenylalanine
    - (2S)-2-amino-3-(3-carbamimidoylphenyl)propanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: APM
    structure: '[O-]C(=O)[C@H](Cc1cccc(c1)C(=[NH2+])N)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  APP:
    id: APP
    name: 1-acetyl-2-carboxypiperidine
    synonyms:
    - (2S)-1-ethanoylpiperidine-2-carboxylic acid
    - (2S)-1-acetylpiperidine-2-carboxylic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: APP
    structure: CC(=O)N1CCCC[C@H]1C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
  AR2:
    id: AR2
    name: arginyl-benzothiazole-6-carboxylic acid
    synonyms:
    - 2-[(2S)-2-azanyl-5-carbamimidamido-pentanoyl]-1,3-benzothiazole-6-carboxylic
      acid
    - R
    - 2-(L-arginyl)-1,3-benzothiazole-6-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: AR2
    structure: N[C@H](C(=O)c1nc2c(s1)cc(cc2)C(=O)[O-])CCCNC(=[NH2+])N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AR4:
    id: AR4
    name: 2-azanyl-5-[3-fluoranyl-5-(hydroxymethyl)-3,4-bis(oxidanyl)oxolan-2-yl]oxy-5-oxidanylidene-pentanoic
      acid
    synonyms:
    - 2-azanyl-5-[3-fluoranyl-5-(hydroxymethyl)-3,4-bis(oxidanyl)oxolan-2-yl]oxy-5-oxidanylidene-pentanoic
      acid
    - E
    - (2S)-2-amino-5-{[(2R,3S,4R,5R)-3-fluoro-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]oxy}-5-oxopentanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: AR4
    structure: OCC1OC(C(C1O)(O)F)OC(=O)CCC(C(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  ARM:
    id: ARM
    name: deoxy-methyl-arginine
    synonyms:
    - 1-[(4S)-4-amino-5-oxo-hexyl]guanidine
    - 1-[(4S)-4-amino-5-oxohexyl]guanidine
    - R
    identifiers:
    - ns: pdb-ccd
      id: ARM
    structure: CC(=O)[C@H](CCCNC(=[NH2+])N)[NH3+]
    base_monomers:
    - R
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  ARV:
    id: ARV
    name: 5-n-allyl-arginine
    synonyms:
    - (Z)-[amino-[[(4S)-4-amino-5-hydroxy-5-oxo-pentyl]amino]methylidene]-prop-2-enyl-azanium
    - X
    - N-[(1Z)-amino{[(4S)-4-amino-4-carboxybutyl]amino}methylidene]prop-2-en-1-aminium
    identifiers:
    - ns: pdb-ccd
      id: ARV
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCN/C(=[NH+]\CC=C)/N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AS7:
    id: AS7
    name: n4-(4-cyanobenzyl)-l-asparagine
    synonyms:
    - (2S)-2-azanyl-4-[(4-cyanophenyl)methylamino]-4-oxidanylidene-butanoic acid
    - N-(4-cyanobenzyl)-L-asparagine
    identifiers:
    - ns: pdb-ccd
      id: AS7
    structure: '[NH3+][C@H](C(=O)[O-])CC(=O)NCc1ccc(cc1)C#N'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AS9:
    id: AS9
    name: n-[hydroxy(methyl)phosphoryl]-l-aspartic acid
    synonyms:
    - N-[(R)-hydroxy(methyl)phosphoryl]-L-aspartic acid
    - (2S)-2-[(hydroxy-methyl-phosphoryl)amino]butanedioic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: AS9
    structure: '[O-]C(=O)C[C@@H](C(=O)[O-])NP(=O)(C)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  ASB:
    id: ASB
    name: aspartic acid-4-carboxymethyl ester
    synonyms:
    - D
    - (2S)-2-amino-4-(carboxymethyloxy)-4-oxo-butanoic acid
    - (2S)-2-amino-4-(carboxymethoxy)-4-oxobutanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: ASB
    structure: O=C(C[C@@H](C(=O)[O-])[NH3+])OCC(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  ASL:
    id: ASL
    name: aspartic acid-4-carboxyethyl ester
    synonyms:
    - D
    - 2-azanyl-4-oxidanylidene-4-(1-oxidanyl-1-oxidanylidene-propan-2-yl)oxy-butanoic
      acid
    - 2-amino-4-(1-carboxyethoxy)-4-oxobutanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: ASL
    structure: O=C(CC(C(=O)[O-])[NH3+])OC(C(=O)[O-])C
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  ASM:
    id: ASM
    name: 2-amino-4-oxo-4(1h-pyrrol-1-yl)butanoic acid
    synonyms:
    - (2S)-2-amino-4-oxo-4-pyrrol-1-yl-butanoic acid
    - X
    - (2S)-2-amino-4-oxo-4-(1H-pyrrol-1-yl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ASM
    structure: '[NH3+][C@H](C(=O)[O-])CC(=O)n1cccc1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  AVN:
    id: AVN
    name: (2s)-amino[(5s)-3-chloro-4,5-dihydroisoxazol-5-yl]acetic acid
    synonyms:
    - (2S)-amino[(5S)-3-chloro-4,5-dihydroisoxazol-5-yl]ethanoic acid
    - (2S)-2-amino-2-[(5S)-3-chloro-4,5-dihydro-1,2-oxazol-5-yl]ethanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: AVN
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@@H]1CC(=NO1)Cl'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AZH:
    id: AZH
    name: azidohomoalanine
    synonyms:
    - A
    - '[(3S)-3-amino-4-hydroxy-4-oxo-butyl]imino-imino-azanium'
    - 1-[(3S)-3-amino-3-carboxypropyl]triaza-1,2-dien-2-ium
    identifiers:
    - ns: pdb-ccd
      id: AZH
    structure: '[N-]=[N+]=NCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  AZK:
    id: AZK
    name: (s)-2-amino-6-azidohexanoic acid
    synonyms:
    - (2S)-2-amino-6-azidohexan-1-ol
    - K
    - (2S)-2-amino-6-azido-hexan-1-ol
    identifiers:
    - ns: pdb-ccd
      id: AZK
    structure: '[N-]=[N+]=NCCCC[C@@H](CO)[NH3+]'
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
  AZS:
    id: AZS
    name: o-diazoacetyl-l-serine
    synonyms:
    - (2S)-2-amino-3-(2-diazoethanoyloxy)propanoic acid
    - S
    - O-(diazoacetyl)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: AZS
    structure: '[O-]C(=O)[C@@H]([NH3+])COC(=O)C=[N+]=N'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  AZY:
    id: AZY
    name: 3-azido-l-tyrosine
    synonyms:
    - 3-azido-L-tyrosine
    - (2S)-2-amino-3-(3-azido-4-hydroxy-phenyl)propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: AZY
    structure: '[N-]=[N+]=Nc1cc(ccc1O)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  B27:
    id: B27
    name: (2r,3s) 3-amino-4-mercapto-2-butanol
    synonyms:
    - (2R,3S)-3-amino-4-sulfanylbutan-2-ol
    - (2R,3S)-3-amino-4-sulfanyl-butan-2-ol
    identifiers:
    - ns: pdb-ccd
      id: B27
    structure: C[C@H]([C@H]([NH3+])CS)O
    base_monomers:
    - T
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  B2H:
    id: B2H
    name: chromophore (thr, trp, gly)
    synonyms:
    - 2-[2-[(1~{R},2~{R})-1-azanyl-2-oxidanyl-propyl]-4-(1~{H}-indol-3-ylmethyl)-5-oxidanyl-imidazol-1-yl]ethanoic
      acid
    - TWG
    identifiers:
    - ns: pdb-ccd
      id: B2H
    structure: '[O-]C(=O)Cn1c(O)c(nc1[C@H]([C@H](O)C)[NH3+])Cc1c[nH]c2c1cccc2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  B2N:
    id: B2N
    name: (2s)-4-amino-2-(aminomethyl)-4-oxobutanoic acid
    synonyms:
    - (2~{S})-2-(aminomethyl)-4-azanyl-4-oxidanylidene-butanoic acid
    - (2S)-4-amino-2-(aminomethyl)-4-oxobutanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B2N
    structure: '[NH3+]C[C@@H](C(=O)[O-])CC(=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  B3A:
    id: B3A
    name: (3s)-3-aminobutanoic acid
    synonyms:
    - A
    - (3S)-3-aminobutanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B3A
    structure: '[O-]C(=O)C[C@@H]([NH3+])C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  B3E:
    id: B3E
    name: (3s)-3-aminohexanedioic acid
    synonyms:
    - E
    - (3S)-3-aminohexanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: B3E
    structure: '[O-]C(=O)CC[C@@H](CC(=O)[O-])[NH3+]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  B3K:
    id: B3K
    name: (3s)-3,7-diaminoheptanoic acid
    synonyms:
    - (3S)-3,7-diaminoheptanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: B3K
    structure: '[NH3+]CCCC[C@@H](CC(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  B3L:
    id: B3L
    name: (3s)-3-amino-5-methylhexanoic acid
    synonyms:
    - (3S)-3-amino-5-methyl-hexanoic acid
    - X
    - (3S)-3-amino-5-methylhexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B3L
    structure: CC(C[C@@H](CC(=O)[O-])[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  B3M:
    id: B3M
    name: (3r)-3-amino-5-(methylsulfanyl)pentanoic acid
    synonyms:
    - (3R)-3-amino-5-methylsulfanyl-pentanoic acid
    - (3R)-3-amino-5-(methylsulfanyl)pentanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: B3M
    structure: CSCC[C@@H](CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  B3Q:
    id: B3Q
    name: (3s)-3,6-diamino-6-oxohexanoic acid
    synonyms:
    - (3S)-3,6-diamino-6-oxo-hexanoic acid
    - (3S)-3,6-diamino-6-oxohexanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: B3Q
    structure: NC(=O)CC[C@@H](CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  B3T:
    id: B3T
    name: 3-amino-2,3,5-trideoxy-d-threo-pentonic acid
    synonyms:
    - (3R,4R)-3-amino-4-hydroxy-pentanoic acid
    - 3-amino-2,3,5-trideoxy-D-threo-pentonic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: B3T
    structure: '[O-]C(=O)C[C@@H]([NH3+])[C@H](O)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  B3U:
    id: B3U
    name: 2-amino-l-histidine
    synonyms:
    - H
    - (2S)-2-azanyl-3-(2-azanyl-1H-imidazol-5-yl)propanoic acid
    - 2-amino-L-histidine
    identifiers:
    - ns: pdb-ccd
      id: B3U
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH+]c([nH]1)N'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  B3X:
    id: B3X
    name: (3s)-3,5-diamino-5-oxopentanoic acid
    synonyms:
    - N
    - (3S)-3,5-diamino-5-oxopentanoic acid
    - (3S)-3,5-diamino-5-oxo-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B3X
    structure: '[O-]C(=O)C[C@H](CC(=O)N)[NH3+]'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  B3Y:
    id: B3Y
    name: (3s)-3-amino-4-(4-hydroxyphenyl)butanoic acid
    synonyms:
    - Y
    - (3S)-3-amino-4-(4-hydroxyphenyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B3Y
    structure: '[NH3+][C@@H](Cc1ccc(cc1)O)CC(=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  B8R:
    id: B8R
    name: (2s,10r)-2,10-diamino-11-(dimethylamino)-11-oxoundecanoic acid
    synonyms:
    - (2~{S},10~{R})-2,10-bis(azanyl)-11-(dimethylamino)-11-oxidanylidene-undecanoic
      acid
    - (2S,10R)-2,10-diamino-11-(dimethylamino)-11-oxoundecanoic acid
    identifiers:
    - ns: pdb-ccd
      id: B8R
    structure: '[O-]C(=O)[C@H](CCCCCCC[C@H](C(=O)N(C)C)[NH3+])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  BB8:
    id: BB8
    name: (2s,3s)-beta-hydroxy-phenylalanine
    synonyms:
    - F
    - (betaS)-beta-hydroxy-L-phenylalanine
    - (2S,3S)-2-amino-3-hydroxy-3-phenyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BB8
    structure: O[C@H]([C@@H](C(=O)[O-])[NH3+])c1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  BBC:
    id: BBC
    name: 3-[(4-aminobutyl)sulfinyl]-2-iminopropan-1-ol
    synonyms:
    - (2E)-3-[(S)-(4-aminobutyl)sulfinyl]-2-iminopropan-1-ol
    - 3-[(S)-4-aminobutylsulfinyl]-2-imino-propan-1-ol
    - C
    identifiers:
    - ns: pdb-ccd
      id: BBC
    structure: OCC(=[NH2+])C[S@@](=O)CCCC[NH3+]
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  BCS:
    id: BCS
    name: benzylcysteine
    synonyms:
    - (2R)-2-amino-3-benzylsulfanyl-propanoic acid
    - S-benzyl-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: BCS
    structure: '[NH3+][C@H](C(=O)[O-])CSCc1ccccc1'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BCX:
    id: BCX
    name: (3r)-3-amino-4-sulfanylbutanoic acid
    synonyms:
    - (3R)-3-amino-4-sulfanylbutanoic acid
    - (3R)-3-azanyl-4-sulfanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BCX
    structure: '[O-]C(=O)C[C@@H]([NH3+])CS'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  BE2:
    id: BE2
    name: 2-aminobenzoic acid
    synonyms:
    - X
    - 2-aminobenzoic acid
    identifiers:
    - ns: pdb-ccd
      id: BE2
    structure: '[O-]C(=O)c1ccccc1N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  BF6:
    id: BF6
    name: '[(4z)-2-(aminomethyl)-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - 2-[(4~{Z})-2-(aminomethyl)-5-oxidanylidene-4-[[4-(phenylcarbonyl)phenyl]methylidene]imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-(aminomethyl)-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: BF6
    structure: '[NH3+]CC1=N/C(=C\c2ccc(cc2)C(=O)c2ccccc2)/C(=O)N1CC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BF9:
    id: BF9
    name: '[(4z)-2-[(1r,2s)-1-amino-2-hydroxypropyl]-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - '[(4Z)-2-[(1R,2S)-1-amino-2-hydroxypropyl]-4-{[4-(benzenecarbonyl)phenyl]methylidene}-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - 2-[(4~{Z})-2-[(1~{R},2~{S})-1-azanyl-2-oxidanyl-propyl]-5-oxidanylidene-4-[[4-(phenylcarbonyl)phenyl]methylidene]imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: BF9
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2ccc(cc2)C(=O)c2ccccc2)/N=C1[C@H]([C@@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  BG1:
    id: BG1
    name: o-[(2s)-2-{methyl[(methylamino)sulfonyl]amino}pentanoyl]-l-serine
    synonyms:
    - S
    - O-{(2S)-2-[methyl(methylsulfamoyl)amino]pentanoyl}-L-serine
    - (2S)-2-amino-3-[(2S)-2-(methyl-(methylsulfamoyl)amino)pentanoyl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: BG1
    structure: CCC[C@H](N(S(=O)(=O)NC)C)C(=O)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  BIF:
    id: BIF
    name: (r)-2-amino-3-(4-phenylcyclohexyl)propanoic acid
    synonyms:
    - F
    - (2S)-2-amino-3-biphenyl-4-ylpropanoic acid (non-preferred name)
    - (2S)-2-amino-3-(4-phenylphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BIF
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)c1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BIL:
    id: BIL
    name: (3r,4s)-3-amino-4-methylhexanoic acid
    synonyms:
    - (3R,4S)-3-amino-4-methylhexanoic acid
    - (3R,4S)-3-amino-4-methyl-hexanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: BIL
    structure: '[O-]C(=O)C[C@@H]([NH3+])[C@H](CC)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  BIU:
    id: BIU
    name: 5-bromo-l-isoleucine
    synonyms:
    - (2S,3S)-2-amino-5-bromo-3-methyl-pentanoic acid
    - 5-bromo-L-isoleucine
    - I
    identifiers:
    - ns: pdb-ccd
      id: BIU
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@H](CCBr)C'
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  BJH:
    id: BJH
    name: 1(r)-1-acetamido-2-(3-carboxy-2-hydroxyphenyl)ethyl boronic acid
    synonyms:
    - 3-[(2R)-2-acetamido-2-(dihydroxyboranyl)ethyl]-2-hydroxy-benzoic acid
    - 3-[(2R)-2-(acetylamino)-2-(dihydroxyboranyl)ethyl]-2-hydroxybenzoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: BJH
    structure: CC(=O)N[C@H](B(O)O)Cc1cccc(c1O)C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  BL2:
    id: BL2
    name: n-(tert-butoxycarbonyl)-l-leucine
    synonyms:
    - N-(tert-butoxycarbonyl)-L-leucine
    - (2S)-4-methyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: BL2
    structure: CC(C[C@@H](C(=O)[O-])NC(=O)OC(C)(C)C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  BMT:
    id: BMT
    name: 4-methyl-4-[(e)-2-butenyl]-4,n-methyl-threonine
    synonyms:
    - (E,2S,3R,4R)-4-methyl-2-(methylamino)-3-oxidanyl-oct-6-enoic acid
    - T
    - 4-[(2E)-but-2-en-1-yl]-2,4,5-trideoxy-2-(methylamino)-L-xylonic acid
    identifiers:
    - ns: pdb-ccd
      id: BMT
    structure: C/C=C/C[C@H]([C@H]([C@@H](C(=O)[O-])[NH2+]C)O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  BNN:
    id: BNN
    name: acetyl-p-amidinophenylalanine
    synonyms:
    - F
    - N-acetyl-4-carbamimidoyl-L-phenylalanine
    - (2S)-2-acetamido-3-(4-carbamimidoylphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BNN
    structure: CC(=O)N[C@H](C(=O)[O-])Cc1ccc(cc1)C(=[NH2+])N
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  BP5:
    id: BP5
    name: 3-(2,2'-bipyridin-5-yl)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-(6-pyridin-2-ylpyridin-3-yl)propanoic acid
    - 3-(2,2'-bipyridin-5-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: BP5
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(nc1)c1ccccn1'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BPE:
    id: BPE
    name: (2s)-2-amino-3-[(3-aminopropyl)sulfanyl]propan-1-ol
    synonyms:
    - (2R)-2-amino-3-[(3-aminopropyl)sulfanyl]propan-1-ol
    - (2R)-2-amino-3-(3-aminopropylsulfanyl)propan-1-ol
    - C
    identifiers:
    - ns: pdb-ccd
      id: BPE
    structure: OC[C@H](CSCCC[NH3+])[NH3+]
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  BSE:
    id: BSE
    name: beta-3-serine
    synonyms:
    - S
    - (2S)-2-(aminomethyl)-3-hydroxy-propanoic acid
    - (2S)-3-amino-2-(hydroxymethyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BSE
    structure: OC[C@@H](C(=O)[O-])C[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  BUC:
    id: BUC
    name: s,s-butylthiocysteine
    synonyms:
    - 3-(butyldisulfanyl)-L-alanine
    - (2R)-2-amino-3-butyldisulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: BUC
    structure: CCCCSSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  BW5:
    id: BW5
    name: (2~{s})-3-(1-adamantyl)-2-azanyl-propanoic acid
    synonyms:
    - (2~{S})-3-(1-adamantyl)-2-azanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BW5
    structure: '[NH3+][C@H](C(=O)[O-])CC12CC3CC(C2)CC(C1)C3'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BWB:
    id: BWB
    name: (2~{s})-2-azanyl-3-[(2~{s},5~{r})-3,4,5-tris(oxidanyl)oxan-2-yl]oxy-propanoic
      acid
    synonyms:
    - (2~{S})-2-azanyl-3-[(2~{S},5~{R})-3,4,5-tris(oxidanyl)oxan-2-yl]oxy-propanoic
      acid
    - S
    identifiers:
    - ns: pdb-ccd
      id: BWB
    structure: '[O-]C(=O)[C@@H]([NH3+])CO[C@H]1OC[C@H](C(C1O)O)O'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  BWV:
    id: BWV
    name: n~5~-(n-butylcarbamimidoyl)-l-ornithine
    synonyms:
    - (2~{S})-2-azanyl-5-[(~{N}-butylcarbamimidoyl)amino]pentanoic acid
    - N~5~-(N-butylcarbamimidoyl)-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: BWV
    structure: CCCCNC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  BXT:
    id: BXT
    name: (2~{s})-2-azanyl-3-[ethyl(methyl)carbamoyl]oxy-propanoic acid
    synonyms:
    - S
    - (2~{S})-2-azanyl-3-[ethyl(methyl)carbamoyl]oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BXT
    structure: '[O-]C(=O)[C@@H]([NH3+])COC(=O)N(CC)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  BYR:
    id: BYR
    name: 3-bromo-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-(3-bromanyl-4-oxidanyl-phenyl)propanoic acid
    - 3-bromo-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: BYR
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)Br)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  BZK:
    id: BZK
    name: (2s, 4s, 6s)-2-amino-6-hydroxy-4-methyl-8-oxodecanoic acid
    synonyms:
    - (2~{S},4~{S},6~{S})-2-azanyl-4-methyl-6-oxidanyl-8-oxidanylidene-decanoic acid
    identifiers:
    - ns: pdb-ccd
      id: BZK
    structure: CCC(=O)C[C@H](C[C@H](C[C@@H](C(=O)[O-])[NH3+])C)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  C12:
    id: C12
    name: 2-(1-amino-2-hydroxypropyl)-4-(4-hydroxybenzyl)-1-(2-oxoethyl)-1h-imidazol-5-olate
    synonyms:
    - 2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzyl)-1-(2-oxoethyl)-1H-imidazol-5-olate
    - 2-[(1R,2R)-1-amino-2-hydroxy-propyl]-5-[(4-hydroxyphenyl)methyl]-3-(2-oxoethyl)imidazol-4-olate
    - TYG
    identifiers:
    - ns: pdb-ccd
      id: C12
    structure: '[O-]C(=O)Cn1c(O)c(nc1[C@H]([C@H](O)C)[NH3+])Cc1ccc(cc1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  C1T:
    id: C1T
    name: s-[(1s,6r)-3,6-dihydroxy-4-methyl-2,5-dioxocyclohex-3-en-1-yl]-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[(1S,6R)-3,6-dihydroxy-4-methyl-2,5-dioxo-cyclohex-3-en-1-yl]sulfanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: C1T
    structure: '[O-]C(=O)[C@H](CS[C@H]1[C@H](O)C(=O)C(=C(C1=O)[O-])C)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  C1X:
    id: C1X
    name: (z)-n~6~-[(4r,5s)-5-(2-carboxyethyl)-4-(carboxymethyl)dihydro-2h-thiopyran-3(4h)-ylidene]-l-lysine
    synonyms:
    - (E)-N~6~-[(4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)dihydro-2H-thiopyran-3(4H)-ylidene]-L-lysine
    - (2S)-2-amino-6-[[(4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)thian-3-ylidene]amino]hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: C1X
    structure: '[O-]C(=O)C[C@@H]1[C@@H](CSC/C/1=N/CCCC[C@@H](C(=O)[O-])[NH3+])CCC(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  C22:
    id: C22
    name: 3-chloro-l-alanine
    synonyms:
    - A
    - (2R)-2-azanyl-3-chloranyl-propanoic acid
    - 3-chloro-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: C22
    structure: '[O-]C(=O)[C@@H]([NH3+])CCl'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  C3Y:
    id: C3Y
    name: s-[(1s)-1-hydroxy-1-(hydroxyamino)ethyl]-l-cysteine
    synonyms:
    - S-[(1S)-1-hydroxy-1-(hydroxyamino)ethyl]-L-cysteine
    - (2R)-2-amino-3-[(1S)-1-hydroxy-1-(hydroxyamino)ethyl]sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: C3Y
    structure: '[O-]C(=O)[C@@H]([NH3+])CS[C@@](NO)(O)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  C5C:
    id: C5C
    name: s-cyclopentyl thiocysteine
    synonyms:
    - 3-(cyclopentyldisulfanyl)-L-alanine
    - C
    - (2R)-2-amino-3-cyclopentyldisulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: C5C
    structure: '[NH3+][C@H](C(=O)[O-])CSSC1CCCC1'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  C66:
    id: C66
    name: 2-aminoethyllysine-carbonylmethylene-cytosine
    synonyms:
    - N~2~-(2-aminoethyl)-N~2~-[(4-amino-2-oxopyrimidin-1(2H)-yl)acetyl]-D-lysine
    - (2R)-6-amino-2-[2-aminoethyl-[2-(4-amino-2-oxo-pyrimidin-1-yl)ethanoyl]amino]hexanoic
      acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: C66
    structure: '[NH3+]CCN([C@@H](C(=O)[O-])CCCC[NH3+])C(=O)Cn1ccc(nc1=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  C6C:
    id: C6C
    name: s-cyclohexyl thiocysteine
    synonyms:
    - 3-(cyclohexyldisulfanyl)-L-alanine
    - (2R)-2-amino-3-cyclohexyldisulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: C6C
    structure: '[O-]C(=O)[C@H](CSSC1CCCCC1)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  C99:
    id: C99
    name: '{(2r)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-2-hydroxy-4,5-dioxoimidazolidin-1-yl}acetic
      acid'
    synonyms:
    - 2-[(2R)-2-[(1S,2R)-1-amino-2-hydroxy-propyl]-2-hydroxy-4,5-dioxo-imidazolidin-1-yl]ethanoic
      acid
    - '{(2R)-2-[(1S,2R)-1-amino-2-hydroxypropyl]-2-hydroxy-4,5-dioxoimidazolidin-1-yl}acetic
      acid'
    - TFG
    identifiers:
    - ns: pdb-ccd
      id: C99
    structure: '[O-]C(=O)CN1C(=O)C(=O)N[C@]1(O)[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  CAB:
    id: CAB
    name: 4,4-dihydroxy-5-oxo-l-norvaline
    synonyms:
    - (2S)-2-azanyl-4,4-dihydroxy-5-oxo-pentanoic acid
    - 4,4-dihydroxy-5-oxo-L-norvaline
    identifiers:
    - ns: pdb-ccd
      id: CAB
    structure: O=CC(C[C@@H](C(=O)[O-])[NH3+])(O)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  CAF:
    id: CAF
    name: s-dimethylarsinoyl-cysteine
    synonyms:
    - (2R)-2-amino-3-dimethylarsorylsulfanyl-propanoic acid
    - C
    - S-(dimethylarsoryl)-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: CAF
    structure: '[O-]C(=O)[C@H](CS[As](=O)(C)C)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  CAS:
    id: CAS
    name: s-(dimethylarsenic)cysteine
    synonyms:
    - S-(dimethylarsanyl)-L-cysteine
    - C
    - (2R)-2-amino-3-dimethylarsanylsulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CAS
    structure: '[NH3+][C@H](C(=O)[O-])CS[As](C)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CCS:
    id: CCS
    name: carboxymethylated cysteine
    synonyms:
    - (2R)-2-amino-3-(carboxymethylsulfanyl)propanoic acid
    - S-(carboxymethyl)-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: CCS
    structure: '[O-]C(=O)CSC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  CCY:
    id: CCY
    name: 2-(1-amino-2-mercapto-ethyl)-5-(4-hydroxy-benzyl)-3-(ethanoyl)-3,5-dihydro-imidazol-4-one
    synonyms:
    - CYG
    - 2-[2-[(1R)-1-amino-2-sulfanyl-ethyl]-4-[(4-hydroxyphenyl)methyl]-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - '[(2S,4S)-2-[(1R)-1-amino-2-sulfanylethyl]-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CCY
    structure: SC[C@@H](C1NC(C(=O)N1CC(=O)[O-])Cc1ccc(cc1)O)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  CDE:
    id: CDE
    name: 1,2-dimethyl-propylamine
    synonyms:
    - (2R)-3-methylbutan-2-amine
    - X
    identifiers:
    - ns: pdb-ccd
      id: CDE
    structure: C[C@H](C(C)C)[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  CDV:
    id: CDV
    name: 3-methyl-2-ureido-butyric acid
    synonyms:
    - N-carbamoyl-D-valine
    - X
    - (2R)-2-(aminocarbonylamino)-3-methyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CDV
    structure: NC(=O)N[C@@H](C(=O)[O-])C(C)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  CE7:
    id: CE7
    name: (3s)-3-amino-4,4,4-trihydroxybutanamide
    synonyms:
    - (3S)-3-amino-4,4,4-trihydroxybutanamide
    - (3~{S})-3-azanyl-4,4,4-tris(oxidanyl)butanamide
    identifiers:
    - ns: pdb-ccd
      id: CE7
    structure: '[NH3+][C@H](C(O)(O)O)CC(=O)N'
    base_monomers:
    - N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CFY:
    id: CFY
    name: '[(4z)-2-{(2r)-2-[(1s)-1-amino-2-phenylethyl]-2-hydroxy-2,5-dihydro-1,3-thiazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - '[(4Z)-2-{(2R)-2-[(1S)-1-amino-2-phenylethyl]-2-hydroxy-2,5-dihydro-1,3-thiazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - FCYG
    - 2-[(4Z)-2-[(2R)-2-[(1S)-1-azanyl-2-phenyl-ethyl]-2-oxidanyl-5H-1,3-thiazol-4-yl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: CFY
    structure: '[O-]C(=O)CN1C(=N/C(=C\c2ccc(cc2)O)/C1=O)C1=N[C@@](SC1)(O)[C@H](Cc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  CG6:
    id: CG6
    name: beta-methyl-cysteine
    synonyms:
    - (2~{R},3~{R})-2-azanyl-3-sulfanyl-butanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CG6
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@H](S)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CGA:
    id: CGA
    name: carboxymethylated glutamic acid
    synonyms:
    - E
    - 2-amino-5-(carboxymethoxy)-5-oxopentanoic acid (non-preferred name)
    - 2-azanyl-5-(2-hydroxy-2-oxoethyloxy)-5-oxidanylidene-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CGA
    structure: O=C(CCC(C(=O)[O-])[NH3+])OCC(=O)[O-]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  CGV:
    id: CGV
    name: s-[(r)-carboxy(hydroxy)methyl]-l-cysteine
    synonyms:
    - S-[(R)-carboxy(hydroxy)methyl]-L-cysteine
    - (2R)-2-azanyl-3-[(1R)-1,2-bis(oxidanyl)-2-oxidanylidene-ethyl]sulfanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: CGV
    structure: '[O-]C(=O)[C@@H](SC[C@@H](C(=O)[O-])[NH3+])O'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  CHG:
    id: CHG
    name: cyclohexyl-glycine
    synonyms:
    - (2S)-2-amino-2-cyclohexyl-ethanoic acid
    - X
    - (2S)-amino(cyclohexyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CHG
    structure: '[NH3+][C@H](C(=O)[O-])C1CCCCC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CHP:
    id: CHP
    name: 3-chloro-4-hydroxyphenylglycine
    synonyms:
    - G
    - (2S)-amino(3-chloro-4-hydroxyphenyl)ethanoic acid
    - (2S)-2-amino-2-(3-chloro-4-hydroxy-phenyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CHP
    structure: '[O-]C(=O)[C@H](c1ccc(c(c1)Cl)O)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  CJO:
    id: CJO
    name: '[(2r,4r)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    synonyms:
    - 2-[(4R)-2-[(1R,2R)-1-amino-2-hydroxy-propyl]-4-[(4-hydroxyphenyl)methyl]-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - GYG
    - '[(2R,4R)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CJO
    structure: '[O-]C(=O)CN1C(=O)[C@H](NC1[C@H]([C@H](O)C)[NH3+])Cc1ccc(cc1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  CLG:
    id: CLG
    name: 2-amino-6-[2-(2-aminooxy-acetylamino)-acetylamino]-hexanoic acid
    synonyms:
    - (2S)-2-amino-6-[2-(2-aminooxyethanoylamino)ethanoylamino]hexanoic acid
    - K
    - N~6~-{N-[(aminooxy)acetyl]glycyl}-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: CLG
    structure: NOCC(=O)NCC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  CLH:
    id: CLH
    name: 2-amino-6-[2-(2-oxo-acetylamino)-acetylamino]-hexanoic acid
    synonyms:
    - K
    - (2S)-2-amino-6-[2-(oxaldehydoylamino)ethanoylamino]hexanoic acid
    - N~6~-[N-(oxoacetyl)glycyl]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: CLH
    structure: O=CC(=O)NCC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  CLV:
    id: CLV
    name: '{(2s)-2-[(1s)-1-aminoethyl]-5-oxo-2,5-dihydro-1h-imidazol-1-yl}acetic acid'
    synonyms:
    - '{(2S)-2-[(1S)-1-aminoethyl]-5-oxo-2,5-dihydro-1H-imidazol-1-yl}acetic acid'
    - 2-[2-[(1S)-1-aminoethyl]-5-oxo-2H-imidazol-1-yl]ethanoic acid
    - AFG
    identifiers:
    - ns: pdb-ccd
      id: CLV
    structure: '[O-]C(=O)CN1C([C@@H]([NH3+])C)N=CC1=O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  CME:
    id: CME
    name: s,s-(2-hydroxyethyl)thiocysteine
    synonyms:
    - (2R)-2-amino-3-(2-hydroxyethyldisulfanyl)propanoic acid
    - C
    - 3-[(2-hydroxyethyl)disulfanyl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: CME
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSCCO'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CML:
    id: CML
    name: (2s)-2-{[(2r)-2-amino-2-carboxyethyl]sulfanyl}butanedioic acid
    synonyms:
    - (2S)-2-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanylbutanedioic acid
    - (2S)-2-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}butanedioic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CML
    structure: '[O-]C(=O)C[C@@H](C(=O)[O-])SC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  CPC:
    id: CPC
    name: 2-methyl-1-methylamino-cyclopropane carboxylic acid
    synonyms:
    - (1S,2S)-2-methyl-1-(methylamino)cyclopropanecarboxylic acid
    - (1S,2S)-2-methyl-1-methylamino-cyclopropane-1-carboxylic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: CPC
    structure: C[NH2+][C@]1(C[C@@H]1C)C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  CQ2:
    id: CQ2
    name: '{(4z)-4-(4-aminobenzylidene)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - '{(4Z)-4-(4-aminobenzylidene)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - 2-[(4Z)-4-[(4-aminophenyl)methylidene]-2-[(1R,2R)-1-azanyl-2-oxidanyl-propyl]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: CQ2
    structure: '[NH3+][C@H](C1=N/C(=C\c2ccc(cc2)N)/C(=O)N1CC(=O)[O-])[C@H](O)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CR0:
    id: CR0
    name: '[2-(1-amino-2-hydroxypropyl)-2-hydroxy-4-isobutyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl]acetaldehyde'
    synonyms:
    - 2-[(2R)-2-[(1S,2R)-1-amino-2-hydroxy-propyl]-2-hydroxy-4-(2-methylpropyl)-5-oxo-imidazol-1-yl]ethanal
    - '[(2R)-2-[(1S,2R)-1-amino-2-hydroxypropyl]-2-hydroxy-4-(2-methylpropyl)-5-oxo-2,5-dihydro-1H-imidazol-1-yl]acetaldehyde'
    - TLG
    identifiers:
    - ns: pdb-ccd
      id: CR0
    structure: '[O-]C(=O)CN1C(=O)C(=N[C@]1(O)[C@H]([C@H](O)C)[NH3+])CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  CR2:
    id: CR2
    name: '{(4z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    - GYG
    - '{(4Z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CR2
    structure: '[NH3+]CC1=N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CR5:
    id: CR5
    name: (2r)-2-(aminomethyl)-2,4-dihydroxy-5-oxo-3-(2-oxoethyl)-2,5-dihydro-1h-imidazol-3-ium
    synonyms:
    - G
    - (2R)-2-(aminomethyl)-3-(carboxymethyl)-2,4-dihydroxy-5-oxo-2,5-dihydro-1H-imidazol-3-ium
    - 2-[(2R)-2-(aminomethyl)-2,5-dihydroxy-4-oxo-3H-imidazol-1-ium-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: CR5
    structure: '[NH3+]C[C@@]1(O)NC(=O)C(=[N+]1CC(=O)[O-])[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  CR8:
    id: CR8
    name: 2-[1-amino-2-(1h-imidazol-5-yl)ethyl]-1-(carboxymethyl)-4-[(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]-1h-imidazol-5-olate
    synonyms:
    - 2-[(1S)-1-amino-2-(3H-imidazol-4-yl)ethyl]-3-(carboxymethyl)-5-[(4-oxo-1-cyclohexa-2,5-dienylidene)methyl]imidazol-4-olate
    - 2-[(1S)-1-amino-2-(1H-imidazol-5-yl)ethyl]-1-(carboxymethyl)-4-[(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]-1H-imidazol-5-olate
    - HYG
    identifiers:
    - ns: pdb-ccd
      id: CR8
    structure: '[O-]C(=O)Cn1c(O)c(nc1[C@H](Cc1cnc[nH]1)[NH3+])C=C1C=CC(=O)C=C1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  CRF:
    id: CRF
    name: '[(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(1h-indol-3-ylmethylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - 2-[2-[(1R,2R)-1-azanyl-2-hydroxy-propyl]-4-(1H-indol-3-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - TWG
    identifiers:
    - ns: pdb-ccd
      id: CRF
    structure: '[O-]C(=O)CN1C(=O)C(=Cc2c[nH]c3c2cccc3)N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  CRG:
    id: CRG
    name: '[2-(1-amino-2-hydroxy-propyl)-4-(3h-imidazol-4-ylmethylene)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-[(1R,2R)-1-amino-2-hydroxy-propyl]-4-(1H-imidazol-4-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - THG
    - '[(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-(1H-imidazol-4-ylmethylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CRG
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2c[nH]cn2)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  CRO:
    id: CRO
    name: '{2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-[(1R,2R)-1-azanyl-2-oxidanyl-propyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - TYG
    identifiers:
    - ns: pdb-ccd
      id: CRO
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2ccc(cc2)O)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  CRX:
    id: CRX
    name: '[2-(1-aminoethyl)-2-hydroxy-4-methylene-5-oxoimidazolidin-1-yl]acetic acid'
    synonyms:
    - ASG
    - 2-[(2R)-2-[(1S)-1-aminoethyl]-2-hydroxy-4-methylidene-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - '{(2R)-2-[(1S)-1-aminoethyl]-2-hydroxy-4-methylidene-5-oxoimidazolidin-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CRX
    structure: '[O-]C(=O)CN1C(=O)C(=C)N[C@]1(O)[C@@H]([NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  CS1:
    id: CS1
    name: s-(2-anilinyl-sulfanyl)-cysteine
    synonyms:
    - 3-[(2-aminophenyl)disulfanyl]-L-alanine
    - (2R)-2-amino-3-(2-aminophenyl)disulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CS1
    structure: '[O-]C(=O)[C@H](CSSc1ccccc1N)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  CS3:
    id: CS3
    name: s-[3-oxo-3-(2-thienyl)propyl]-l-cysteine
    synonyms:
    - S-(3-oxo-3-thiophen-2-ylpropyl)-L-cysteine
    - C
    - (2R)-2-amino-3-(3-oxo-3-thiophen-2-yl-propyl)sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CS3
    structure: '[O-]C(=O)[C@H](CSCCC(=O)c1cccs1)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  CS4:
    id: CS4
    name: s-[3-(3,4-dichlorophenyl)-3-oxopropyl]-l-cysteine
    synonyms:
    - (2R)-2-amino-3-[3-(3,4-dichlorophenyl)-3-oxo-propyl]sulfanyl-propanoic acid
    - S-[3-(3,4-dichlorophenyl)-3-oxopropyl]-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: CS4
    structure: '[O-]C(=O)[C@H](CSCCC(=O)c1ccc(c(c1)Cl)Cl)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  CSA:
    id: CSA
    name: s-acetonylcysteine
    synonyms:
    - S-(2-oxopropyl)-L-cysteine
    - C
    - (2R)-2-amino-3-(2-oxopropylsulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CSA
    structure: CC(=O)CSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  CSH:
    id: CSH
    name: '[2-(2-hydroxy-1-methyl-ethyl)-4-(1h-imidazol-4-ylmethyl)-5-oxo-imidazolidin-1-yl]-acetic
      acid'
    synonyms:
    - SHG
    - 2-[2-[(1R)-1-amino-2-hydroxy-ethyl]-4-(1H-imidazol-4-ylmethyl)-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - '[(2S,4S)-2-[(1R)-1-amino-2-hydroxyethyl]-4-(1H-imidazol-4-ylmethyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: CSH
    structure: '[O-]C(=O)CN1C(NC(C1=O)Cc1c[nH]cn1)[C@@H]([NH3+])CO'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  CSJ:
    id: CSJ
    name: s-[(2-aminophenyl)carbonyl]-l-cysteine
    synonyms:
    - S-[(2-aminophenyl)carbonyl]-L-cysteine
    - (2R)-2-amino-3-(2-aminophenyl)carbonylsulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CSJ
    structure: '[O-]C(=O)[C@H](CSC(=O)c1ccccc1N)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  CSK:
    id: CSK
    name: s-(methylselanyl)-l-cysteine
    synonyms:
    - S-(methylselanyl)-L-cysteine
    - (2R)-2-azanyl-3-methylselanylsulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CSK
    structure: '[O-]C(=O)[C@@H]([NH3+])CS[Se]C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CSR:
    id: CSR
    name: s-arsonocysteine
    synonyms:
    - (2R)-2-amino-3-arsonosulfanyl-propanoic acid
    - S-arsono-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: CSR
    structure: '[O-]C(=O)[C@H](CS[As](=O)([O-])[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  CTE:
    id: CTE
    name: 7-chlorotryptophan
    synonyms:
    - (2S)-2-azanyl-3-(7-chloro-1H-indol-3-yl)propanoic acid
    - 7-chloro-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: CTE
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cccc2Cl'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CTH:
    id: CTH
    name: 4-chlorothreonine
    synonyms:
    - (2S,3S)-2-amino-4-chloro-3-hydroxy-butanoic acid
    - 4-chloro-L-threonine
    - T
    identifiers:
    - ns: pdb-ccd
      id: CTH
    structure: ClC[C@H]([C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  CWD:
    id: CWD
    name: 3-(5-chloro-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[5-chloranyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]propanoic
      acid
    - 3-(5-chloro-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: CWD
    structure: '[O-]C(=O)[C@H](Cn1cc(Cl)c(=O)[nH]c1=O)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  CWR:
    id: CWR
    name: (4-methyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl)acetic acid
    synonyms:
    - S
    - (4-methyl-5-oxo-2,5-dihydro-1H-imidazol-1-yl)acetic acid
    - 2-(4-methyl-5-oxo-2H-imidazol-1-yl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CWR
    structure: '[O-]C(=O)CN1CN=C(C1=O)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  CY0:
    id: CY0
    name: s-{3-[(4-anilinoquinazolin-6-yl)amino]-3-oxopropyl}-l-cysteine
    synonyms:
    - S-(3-oxo-3-{[4-(phenylamino)quinazolin-6-yl]amino}propyl)-L-cysteine
    - (2R)-2-amino-3-[3-oxo-3-[(4-phenylazanylquinazolin-6-yl)amino]propyl]sulfanyl-propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CY0
    structure: O=C(Nc1ccc2c(c1)c(ncn2)Nc1ccccc1)CCSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  CY1:
    id: CY1
    name: acetamidomethylcysteine
    synonyms:
    - (2R)-3-(acetamidomethylsulfanyl)-2-amino-propanoic acid
    - C
    - S-[(acetylamino)methyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: CY1
    structure: CC(=O)NCSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  CY4:
    id: CY4
    name: s-butyryl-cystein
    synonyms:
    - (2R)-2-amino-3-butanoylsulfanyl-propanoic acid
    - C
    - S-butanoyl-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: CY4
    structure: '[O-]C(=O)[C@@H]([NH3+])CSC(=O)CCC'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CYD:
    id: CYD
    name: 2-amino-6-(cystein-s-yl)-5-oxo-hexanoic acid
    synonyms:
    - 6-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}-5-oxo-L-norleucine
    - (2S)-2-amino-6-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanyl-5-oxo-hexanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CYD
    structure: O=C(CC[C@@H](C(=O)[O-])[NH3+])CSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  CYF:
    id: CYF
    name: 5-[2-(2-amino-2-carbamoyl-ethylsulfanyl)-acetylamino]-2-(3,6-dihydroxy-9,9a-dihydro-3h-xanthen-9-yl)-benzoic
      acid
    synonyms:
    - 5-[({[(2R)-2,3-diamino-3-oxopropyl]sulfanyl}acetyl)amino]-2-(3,6-dihydroxy-9H-xanthen-9-yl)benzoic
      acid
    - C
    - 5-[2-[(2R)-2,3-diamino-3-oxo-propyl]sulfanylethanoylamino]-2-(3,6-dihydroxy-9H-xanthen-9-yl)benzoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: CYF
    structure: O=C(Nc1ccc(c(c1)C(=O)[O-])C1c2ccc(cc2Oc2c1ccc(c2)O)O)CSC[C@@H](C(=O)N)[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  CYG:
    id: CYG
    name: 2-amino-4-(amino-3-oxo-propylsulfanylcarbonyl)-butyric acid
    synonyms:
    - (2S)-2-amino-5-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanyl-5-oxo-pentanoic
      acid
    - (2S)-2-amino-5-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}-5-oxopentanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: CYG
    structure: O=C(SC[C@@H](C(=O)[O-])[NH3+])CC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  CYJ:
    id: CYJ
    name: (z)-n~6~-[(4r,5s)-5-(2-carboxyethyl)-4-(carboxymethyl)piperidin-3-ylidene]-l-lysine
    synonyms:
    - (2S)-2-amino-6-[[(4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)piperidin-3-ylidene]amino]hexanoic
      acid
    - K
    - (E)-N~6~-[(4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)piperidin-3-ylidene]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: CYJ
    structure: '[O-]C(=O)C[C@@H]1[C@@H](C[NH2+]C/C/1=N/CCCC[C@@H](C(=O)[O-])[NH3+])CCC(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  CYQ:
    id: CYQ
    name: 2-amino-3-phosphonomethylsulfanyl-propionic acid
    synonyms:
    - (2R)-2-amino-3-(phosphonomethylsulfanyl)propanoic acid
    - S-(phosphonomethyl)-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: CYQ
    structure: '[O-]C(=O)[C@H](CSCP(=O)(O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  CYR:
    id: CYR
    name: n~5~-[{[(2r)-2-amino-2-carboxyethyl]sulfanyl}(iminio)methyl]-l-ornithinate
    synonyms:
    - '{[(4S)-4-amino-4-carboxybutyl]amino}{[(2R)-2-amino-2-carboxyethyl]sulfanyl}methaniminium'
    - '[[[(4S)-4-amino-5-hydroxy-5-oxo-pentyl]amino]-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanyl-methylidene]azanium'
    - C
    identifiers:
    - ns: pdb-ccd
      id: CYR
    structure: '[NH2+]=C(SC[C@@H](C(=O)[O-])[NH3+])NCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  CYW:
    id: CYW
    name: s-[(2r)-2-hydroxypropanoyl]-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[(2R)-2-hydroxypropanoyl]sulfanyl-propanoic acid
    - S-[(2R)-2-hydroxypropanoyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: CYW
    structure: '[O-]C(=O)[C@@H]([NH3+])CSC(=O)[C@H](O)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  CZ2:
    id: CZ2
    name: s-(dihydroxyarsino)cysteine
    synonyms:
    - S-(dihydroxyarsanyl)-L-cysteine
    - C
    - (2R)-2-amino-3-dihydroxyarsanylsulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: CZ2
    structure: '[O-][As](SC[C@@H](C(=O)[O-])[NH3+])O'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  CZO:
    id: CZO
    name: '[(2r,4s)-2-[(1s,2r)-1-amino-2-hydroxypropyl]-2-hydroxy-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    synonyms:
    - '[(2R,4S)-2-[(1S,2R)-1-amino-2-hydroxypropyl]-2-hydroxy-4-(4-hydroxybenzyl)-5-oxoimidazolidin-1-yl]acetic
      acid'
    - 2-[(2R,4S)-2-[(1S,2R)-1-amino-2-hydroxy-propyl]-2-hydroxy-4-[(4-hydroxyphenyl)methyl]-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - GYG
    identifiers:
    - ns: pdb-ccd
      id: CZO
    structure: '[O-]C(=O)CN1C(=O)[C@@H](N[C@]1(O)[C@H]([C@H](O)C)[NH3+])Cc1ccc(cc1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  D0Q:
    id: D0Q
    name: 5-methyl-l-tryptophan
    synonyms:
    - (2~{S})-2-azanyl-3-(5-methyl-1~{H}-indol-3-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: D0Q
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc(C)cc2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  D2T:
    id: D2T
    name: (3r)-3-(methylsulfanyl)-l-aspartic acid
    synonyms:
    - (3R)-3-(methylsulfanyl)-L-aspartic acid
    - (2R,3R)-2-azanyl-3-methylsulfanyl-butanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: D2T
    structure: CS[C@H]([C@@H](C(=O)[O-])[NH3+])C(=O)[O-]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  D4P:
    id: D4P
    name: (2s)-amino(4-hydroxyphenyl)acetic acid
    synonyms:
    - (2S)-2-amino-2-(4-hydroxyphenyl)ethanoic acid
    - (2S)-amino(4-hydroxyphenyl)ethanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: D4P
    structure: '[NH3+][C@@H](c1ccc(cc1)O)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DAB:
    id: DAB
    name: 2,4-diaminobutyric acid
    synonyms:
    - A
    - (2S)-2,4-diaminobutanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DAB
    structure: '[O-]C(=O)[C@@H]([NH3+])CC[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  DBS:
    id: DBS
    name: 2-(2,3-dihydroxy-benzoylamino)-3-hydroxy-propionic acid
    synonyms:
    - S
    - N-[(2,3-dihydroxyphenyl)carbonyl]-L-serine
    - (2S)-2-[(2,3-dihydroxyphenyl)carbonylamino]-3-hydroxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DBS
    structure: OC[C@@H](C(=O)[O-])NC(=O)c1cccc(c1O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  DBY:
    id: DBY
    name: 3,5 dibromotyrosine
    synonyms:
    - Y
    - 3,5-dibromo-L-tyrosine
    - (2S)-2-amino-3-(3,5-dibromo-4-hydroxy-phenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DBY
    structure: '[O-]C(=O)[C@H](Cc1cc(Br)c(c(c1)Br)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  DBZ:
    id: DBZ
    name: 3-(benzoylamino)-l-alanine
    synonyms:
    - A
    - 3-[(phenylcarbonyl)amino]-L-alanine
    - (2S)-2-amino-3-benzamido-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DBZ
    structure: '[NH3+][C@H](C(=O)[O-])CNC(=O)c1ccccc1'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DC2:
    id: DC2
    name: n-acetyl-s-[(1s)-1,2-dichloroethyl]-l-cysteine
    synonyms:
    - (2R)-2-acetamido-3-[(1S)-1,2-dichloroethyl]sulfanyl-propanoic acid
    - N-acetyl-S-[(1S)-1,2-dichloroethyl]-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: DC2
    structure: '[O-]C(=O)[C@@H](NC(=O)C)CS[C@H](CCl)Cl'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  DFI:
    id: DFI
    name: 2,2-difluorostatine
    synonyms:
    - (3R,4S)-4-amino-2,2-difluoro-3-hydroxy-6-methylheptanoic acid
    - X
    - (3R,4S)-4-amino-2,2-difluoro-3-hydroxy-6-methyl-heptanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DFI
    structure: CC(C[C@@H]([C@H](C(C(=O)[O-])(F)F)O)[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  DFO:
    id: DFO
    name: 2,2-difluoro-3-hydrostatine
    synonyms:
    - (4S)-4-amino-2,2-difluoro-3,3-dihydroxy-6-methyl-heptanoic acid
    - (4S)-4-amino-2,2-difluoro-3,3-dihydroxy-6-methylheptanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: DFO
    structure: '[NH3+][C@H](C(C(C(=O)[O-])(F)F)(O)O)CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DHL:
    id: DHL
    name: 2-amino-ethanethiol
    synonyms:
    - 2-aminoethanethiol
    - X
    identifiers:
    - ns: pdb-ccd
      id: DHL
    structure: SCC[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  DHP:
    id: DHP
    name: 3-decyl-2,5-dioxo-4-hydroxy-3-pyrroline
    synonyms:
    - 3-decyl-4-hydroxy-1H-pyrrole-2,5-dione
    - 3-decyl-4-hydroxy-pyrrole-2,5-dione
    - X
    identifiers:
    - ns: pdb-ccd
      id: DHP
    structure: CCCCCCCCCCC1=C([O-])C(=O)NC1=O
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
  DI7:
    id: DI7
    name: 2,6-dimethyl-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-(2,6-dimethyl-4-oxidanyl-phenyl)propanoic acid
    - Y
    - 2,6-dimethyl-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: DI7
    structure: '[NH3+][C@H](C(=O)[O-])Cc1c(C)cc(cc1C)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DI8:
    id: DI8
    name: (3s)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid
    synonyms:
    - (3S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: DI8
    structure: '[O-]C(=O)[C@H]1[NH2+]Cc2c(C1)cccc2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  DIR:
    id: DIR
    name: 3-{[(e)-amino(hydroxyimino)methyl]amino}alanine
    synonyms:
    - 3-(N''-hydroxycarbamimidamido)-L-alanine
    - R
    - (2S)-2-amino-3-[(N'-hydroxycarbamimidoyl)amino]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DIR
    structure: O/[NH+]=C(/NC[C@@H](C(=O)[O-])N)\N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  DLS:
    id: DLS
    name: di-acetyl-lysine
    synonyms:
    - (2S)-2,6-diacetamidohexanoic acid
    - K
    - N~2~,N~6~-diacetyl-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: DLS
    structure: CC(=O)NCCCC[C@@H](C(=O)[O-])NC(=O)C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  DM0:
    id: DM0
    name: n~2~,n~2~,n~6~,n~6~-tetramethyl-l-lysine
    synonyms:
    - N~2~,N~2~,N~6~,N~6~-tetramethyl-L-lysine
    - K
    - (2S)-2,6-bis(dimethylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DM0
    structure: C[NH+](CCCC[C@@H](C(=O)[O-])[NH+](C)C)C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
  DMK:
    id: DMK
    name: 3,3-dimethyl aspartic acid
    synonyms:
    - 3,3-dimethyl-L-aspartic acid
    - D
    - (3S)-3-azanyl-2,2-dimethyl-butanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: DMK
    structure: '[O-]C(=O)[C@H](C(C(=O)[O-])(C)C)[NH3+]'
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  DMT:
    id: DMT
    name: 3-hydroxy-4,4-dimethyl-2-(methylamino)-6-octenoic acid
    synonyms:
    - 4-[(2E)-but-2-en-1-yl]-2,4,5-trideoxy-4-methyl-2-(methylamino)-D-arabinonic
      acid
    - X
    - (E,2S,3R)-3-hydroxy-4,4-dimethyl-2-methylamino-oct-6-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: DMT
    structure: C/C=C/CC([C@H]([C@@H](C(=O)[O-])[NH2+]C)O)(C)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  DNL:
    id: DNL
    name: 6-amino-hexanal
    synonyms:
    - 6-aminohexanal
    - K
    identifiers:
    - ns: pdb-ccd
      id: DNL
    structure: '[NH3+]CCCCCC(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DNP:
    id: DNP
    name: 3-amino-alanine
    synonyms:
    - A
    - 3-ammonio-L-alanine
    - '[(2S)-2-amino-3-hydroxy-3-oxo-propyl]azanium'
    identifiers:
    - ns: pdb-ccd
      id: DNP
    structure: '[O-]C(=O)[C@H](C[NH3+])N'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  DNS:
    id: DNS
    name: n~6~-{[5-(dimethylamino)-1-naphthyl]sulfonyl}-l-lysine
    synonyms:
    - (2S)-2-amino-6-[(5-dimethylaminonaphthalen-1-yl)sulfonylamino]hexanoic acid
    - K
    - N~6~-{[5-(dimethylamino)naphthalen-1-yl]sulfonyl}-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: DNS
    structure: '[O-]C(=O)[C@H](CCCCNS(=O)(=O)c1cccc2c1cccc2N(C)C)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 27
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    - molecule: Monomer
      element: H
      position: 27
      charge: 1
  DNW:
    id: DNW
    name: 3-[(2,4-dinitrophenyl)amino]-l-alanine
    synonyms:
    - 3-[(2,4-dinitrophenyl)amino]-L-alanine
    - (2S)-2-azanyl-3-[(2,4-dinitrophenyl)amino]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DNW
    structure: '[O-]C(=O)[C@H](CNc1ccc(cc1[N+](=O)[O-])[N+](=O)[O-])[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  DO2:
    id: DO2
    name: 5,5-dihydroxy-6-oxo-l-norleucine
    synonyms:
    - 5,5-dihydroxy-6-oxo-L-norleucine
    - (2S)-2-azanyl-5,5-dihydroxy-6-oxo-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DO2
    structure: O=CC(CC[C@@H](C(=O)[O-])[NH3+])(O)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  DOA:
    id: DOA
    name: 12-amino-dodecanoic acid
    synonyms:
    - 12-aminododecanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: DOA
    structure: '[NH3+]CCCCCCCCCCCC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DON:
    id: DON
    name: 6-diazenyl-5-oxo-l-norleucine
    synonyms:
    - (2S)-2-amino-6-diazenyl-5-oxo-hexanoic acid
    - L
    - 6-diazenyl-5-oxo-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: DON
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC(=O)CN=N'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  DPL:
    id: DPL
    name: 4-oxoproline
    synonyms:
    - P
    - (2S)-4-oxopyrrolidine-2-carboxylic acid
    - 4-oxo-L-proline
    identifiers:
    - ns: pdb-ccd
      id: DPL
    structure: O=C1C[NH2+][C@@H](C1)C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  DPP:
    id: DPP
    name: diaminopropanoic acid
    synonyms:
    - A
    - (2S)-2,3-bis(azanyl)propanoic acid
    - 3-amino-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: DPP
    structure: '[O-]C(=O)[C@H](C[NH3+])N'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  DPQ:
    id: DPQ
    name: (s)-2-amino-3-(4-hydroxy-3-oxocyclohexa-1,4-dienyl)propanoic acid
    synonyms:
    - 3-(4-hydroxy-3-oxocyclohexa-1,4-dien-1-yl)-L-alanine
    - (2S)-2-amino-3-(4-hydroxy-3-oxo-1-cyclohexa-1,4-dienyl)propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: DPQ
    structure: '[O-]C(=O)[C@@H]([NH3+])CC1=CC(=O)C(=C[CH-]1)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  DV7:
    id: DV7
    name: l-(7-hydroxycoumarin-4-yl)ethylglycine
    synonyms:
    - (2~{S})-2-azanyl-4-(7-oxidanyl-2-oxidanylidene-chromen-4-yl)butanoic acid
    - (2S)-2-amino-4-(7-hydroxy-2-oxo-2H-1-benzopyran-4-yl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DV7
    structure: '[O-]C(=O)[C@H](CCc1cc(=O)oc2c1ccc(c2)O)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  DYA:
    id: DYA
    name: didehydroaspartate
    synonyms:
    - D
    - (Z)-2-azanylbut-2-enedioic acid
    identifiers:
    - ns: pdb-ccd
      id: DYA
    structure: '[O-]C(=O)/C=C(/C(=O)[O-])\[NH3+]'
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  DYG:
    id: DYG
    name: (3s)-3-amino-3-[(4z)-1-(carboxymethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-2-yl]propanoic
      acid
    synonyms:
    - DYG
    - (3S)-3-amino-3-[(4Z)-1-(carboxymethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazol-2-yl]propanoic
      acid
    - (3S)-3-amino-3-{(4Z)-1-(carboxymethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-2-yl}propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: DYG
    structure: '[NH3+][C@H](C1=N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-])CC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  DYJ:
    id: DYJ
    name: 1-[(2e)-4-carboxy-4-oxobut-2-en-2-yl]-l-proline
    synonyms:
    - P
    - (2S)-1-[(E)-5-oxidanyl-4,5-bis(oxidanylidene)pent-2-en-2-yl]pyrrolidine-2-carboxylic
      acid
    - 1-[(2E)-4-carboxy-4-oxobut-2-en-2-yl]-L-proline
    identifiers:
    - ns: pdb-ccd
      id: DYJ
    structure: C/C(=C\C(=O)C(=O)[O-])/N1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
  DYS:
    id: DYS
    name: s-[5-(2-aminoethyl)-2,3-dihydroxyphenyl]-l-cysteine
    synonyms:
    - S-[5-(2-aminoethyl)-2,3-dihydroxyphenyl]-L-cysteine
    - C
    - (2R)-2-amino-3-[5-(2-aminoethyl)-2,3-dihydroxy-phenyl]sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: DYS
    structure: '[NH3+]CCc1cc(SC[C@@H](C(=O)[O-])[NH3+])c(c(c1)O)O'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  E0Y:
    id: E0Y
    name: (3s,5r)-5-[(2r,3r)-1,3-dihydroxybutan-2-yl]-3-({(3r)-1-[(1e)-ethanimidoyl]pyrrolidin-3-yl}sulfanyl)-l-proline
    synonyms:
    - (3S,5R)-5-[(2R,3R)-1,3-dihydroxybutan-2-yl]-3-({(3R)-1-[(1E)-ethanimidoyl]pyrrolidin-3-yl}sulfanyl)-L-proline
    - (5~{R})-5-[(2~{R},3~{R})-1,3-bis(oxidanyl)butan-2-yl]-3-[(3~{R})-1-ethanimidoylpyrrolidin-3-yl]sulfanyl-pyrrolidine-2-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: E0Y
    structure: OC[C@@H]([C@H]1CC(C([NH2+]1)C(=O)[O-])S[C@@H]1CCN(C1)C(=[NH2+])C)[C@H](O)C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  E95:
    id: E95
    name: 7-methyl-l-tryptophan
    synonyms:
    - (2~{S})-2-azanyl-3-(7-methyl-1~{H}-indol-3-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: E95
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cccc2C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  E9M:
    id: E9M
    name: n-methyl-l-tryptophan
    synonyms:
    - (2S)-3-(1H-indol-3-yl)-2-(methylamino)propanoic acid
    - N-methyl-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: E9M
    structure: C[NH2+][C@H](C(=O)[O-])Cc1c[nH]c2c1cccc2
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  E9V:
    id: E9V
    name: n-methyl-l-histidine
    synonyms:
    - (2~{S})-3-(1~{H}-imidazol-5-yl)-2-(methylamino)propanoic acid
    - N-methyl-L-histidine
    identifiers:
    - ns: pdb-ccd
      id: E9V
    structure: '[O-]C(=O)[C@@H]([NH2+]C)Cc1cnc[nH]1'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  ECC:
    id: ECC
    name: (4s)-4-amino-5-hydroxypentanamide
    synonyms:
    - (4S)-4-azanyl-5-oxidanyl-pentanamide
    - Q
    - (4S)-4-amino-5-hydroxypentanamide
    identifiers:
    - ns: pdb-ccd
      id: ECC
    structure: NC(=O)CC[C@H]([NH3+])CO
    base_monomers:
    - Q
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  ECX:
    id: ECX
    name: s-ethyl-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-ethylsulfanyl-propanoic acid
    - S-ethyl-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: ECX
    structure: '[O-]C(=O)[C@@H]([NH3+])CSCC'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  EFC:
    id: EFC
    name: s,s-(2-fluoroethyl)thiocysteine
    synonyms:
    - (2R)-2-amino-3-(2-fluoroethyldisulfanyl)propanoic acid
    - 3-[(2-fluoroethyl)disulfanyl]-L-alanine
    - C
    identifiers:
    - ns: pdb-ccd
      id: EFC
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSCCF'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  EJA:
    id: EJA
    name: s-[(1z)-2-carboxy-n-hydroxyethanimidoyl]-l-cysteine
    synonyms:
    - (2~{R})-2-azanyl-3-[(~{Z})-~{C}-(2-hydroxy-2-oxoethyl)-~{N}-oxidanyl-carbonimidoyl]sulfanyl-propanoic
      acid
    - S-[(1Z)-2-carboxy-N-hydroxyethanimidoyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: EJA
    structure: O/N=C(/CC(=O)[O-])\SC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  ELY:
    id: ELY
    name: n~6~,n~6~-diethyl-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-(diethylamino)hexanoic acid
    - N~6~,N~6~-diethyl-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: ELY
    structure: CC[NH+](CCCC[C@@H](C(=O)[O-])[NH3+])CC
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  EME:
    id: EME
    name: n-methyl-l-glutamic acid
    synonyms:
    - (2S)-2-(methylamino)pentanedioic acid
    - N-methyl-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: EME
    structure: C[NH2+][C@H](C(=O)[O-])CCC(=O)[O-]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  EO2:
    id: EO2
    name: 4,5-dehydro-l-leucine
    synonyms:
    - (2~{S})-2-azanyl-4-methyl-pent-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: EO2
    structure: CC(=C)C[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  ESB:
    id: ESB
    name: 3-[(3e)-3-(ethylimino)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-l-alanine
    synonyms:
    - (2S)-2-amino-3-[(3E)-3-ethylimino-4-hydroxy-6-oxo-1-cyclohexa-1,4-dienyl]propanoic
      acid
    - Y
    - 3-[(3E)-3-(ethylimino)-4-hydroxy-6-oxocyclohexa-1,4-dien-1-yl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: ESB
    structure: CC/[NH+]=C/1\C=C(C[C@@H](C(=O)[O-])[NH3+])C(=O)C=C1[O-]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  ESC:
    id: ESC
    name: 2-amino-4-ethyl sulfanyl butyric acid
    synonyms:
    - S-ethyl-L-homocysteine
    - (2S)-2-amino-4-ethylsulfanyl-butanoic acid
    - M
    identifiers:
    - ns: pdb-ccd
      id: ESC
    structure: CCSCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  ETA:
    id: ETA
    name: ethanolamine
    synonyms:
    - 2-aminoethanol
    - 2-azanylethanol
    identifiers:
    - ns: pdb-ccd
      id: ETA
    structure: OCC[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  EUP:
    id: EUP
    name: 4-amino-l-allothreonine
    synonyms:
    - (2~{S},3~{S})-2,4-bis(azanyl)-3-oxidanyl-butanoic acid
    - 4-amino-L-allothreonine
    identifiers:
    - ns: pdb-ccd
      id: EUP
    structure: '[NH3+]C[C@@H]([C@@H](C(=O)[O-])[NH3+])O'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  EXY:
    id: EXY
    name: 6-[(2r)-oxiran-2-yl]-l-norleucine
    synonyms:
    - (2S)-2-amino-6-[(2R)-oxiran-2-yl]hexanoic acid
    - L
    - 6-[(2R)-oxiran-2-yl]-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: EXY
    structure: '[O-]C(=O)[C@H](CCCC[C@@H]1CO1)[NH3+]'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  EYG:
    id: EYG
    name: '{(2r,4z)-2-[(1r)-1-amino-3-(methylsulfanyl)propyl]-2-hydroxy-4-[(4-hydroxyphenyl)methylidene]-5-oxoimidazolidin-1-yl}acetic
      acid'
    synonyms:
    - 2-[(2R,4Z)-2-(1-azanyl-3-methylsulfanyl-propyl)-2-hydroxy-4-[(4-hydroxyphenyl)methylidene]-5-oxo-imidazolidin-1-yl]ethanoic
      acid
    - '[(2R,4Z)-2-[(1R)-1-amino-3-(methylsulfanyl)propyl]-2-hydroxy-4-(4-hydroxybenzylidene)-5-oxoimidazolidin-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: EYG
    structure: CSCCC([C@@]1(O)N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  F2F:
    id: F2F
    name: 3,4-difluoro-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-amino-3-(3,4-difluorophenyl)propanoic acid
    - 3,4-difluoro-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: F2F
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)F)F)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  F2Y:
    id: F2Y
    name: 3,5-difluoro-l-tyrosine
    synonyms:
    - 3,5-difluoro-L-tyrosine
    - (2S)-2-azanyl-3-[3,5-bis(fluoranyl)-4-oxidanyl-phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: F2Y
    structure: '[NH3+][C@H](C(=O)[O-])Cc1cc(F)c(c(c1)F)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  F3M:
    id: F3M
    name: methyl 4-amino-2,4,5-trideoxy-5,5,5-trifluoro-l-threo-pentonate
    synonyms:
    - methyl (3S,4R)-4-azanyl-5,5,5-trifluoro-3-hydroxy-pentanoate
    - methyl 4-amino-2,4,5-trideoxy-5,5,5-trifluoro-L-threo-pentonate
    identifiers:
    - ns: pdb-ccd
      id: F3M
    structure: COC(=O)C[C@@H]([C@H](C(F)(F)F)N)O
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  F3T:
    id: F3T
    name: 4-amino-2,4,5-trideoxy-5,5,5-trifluoro-l-threo-pentonic acid
    synonyms:
    - (3S,4R)-4-azanyl-5,5,5-trifluoro-3-hydroxy-pentanoic acid
    - 4-amino-2,4,5-trideoxy-5,5,5-trifluoro-L-threo-pentonic acid
    identifiers:
    - ns: pdb-ccd
      id: F3T
    structure: O[C@H]([C@H](C(F)(F)F)N)CC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  F7W:
    id: F7W
    name: 7-fluorotryptophan
    synonyms:
    - (2~{S})-2-azanyl-3-(7-fluoranyl-1~{H}-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: F7W
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cccc2F'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  FAK:
    id: FAK
    name: n~6~-(trifluoroacetyl)-l-lysine
    synonyms:
    - K
    - (2S)-2-azanyl-6-[2,2,2-tris(fluoranyl)ethanoylamino]hexanoic acid
    - N~6~-(trifluoroacetyl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: FAK
    structure: '[O-]C(=O)[C@H](CCCCNC(=O)C(F)(F)F)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  FB5:
    id: FB5
    name: 2-(difluoromethyl)-6-(dihydroxyboranyl)-l-norleucine
    synonyms:
    - A
    - 2-(difluoromethyl)-6-(dihydroxyboranyl)-L-norleucine
    - (2S)-2-azanyl-2-[bis(fluoranyl)methyl]-6-(dihydroxyboranyl)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FB5
    structure: OB(CCCC[C@](C(=O)[O-])(C(F)F)[NH3+])O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  FB6:
    id: FB6
    name: 6-(dihydroxyboranyl)-2-methyl-l-norleucine
    synonyms:
    - A
    - 2-azanyl-6-(dihydroxyboranyl)-2-methyl-hexanoic acid
    - 6-(dihydroxyboranyl)-2-methyl-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: FB6
    structure: OB(CCCCC(C(=O)[O-])([NH3+])C)O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  FC0:
    id: FC0
    name: n-carboxy-l-phenylalanine
    synonyms:
    - F
    - N-carboxy-L-phenylalanine
    - (2S)-2-(carboxyamino)-3-phenyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FC0
    structure: '[O-]C(=O)[C@H](Cc1ccccc1)NC(=O)[O-]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  FCL:
    id: FCL
    name: 3-chloro-l-phenylalanine
    synonyms:
    - F
    - 3-chloro-L-phenylalanine
    - (2S)-2-amino-3-(3-chlorophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FCL
    structure: '[O-]C(=O)[C@H](Cc1cccc(c1)Cl)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  FDL:
    id: FDL
    name: n~6~-acetyl-n-(4-methyl-2-oxo-2h-chromen-7-yl)-l-lysinamide
    synonyms:
    - N~6~-acetyl-N-(4-methyl-2-oxo-2H-chromen-7-yl)-L-lysinamide
    - (2S)-6-acetamido-2-azanyl-N-(4-methyl-2-oxidanylidene-chromen-7-yl)hexanamide
    identifiers:
    - ns: pdb-ccd
      id: FDL
    structure: CC(=O)NCCCC[C@@H](C(=O)Nc1ccc2c(c1)oc(=O)cc2C)[NH3+]
    base_monomers:
    - K
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  FFM:
    id: FFM
    name: s-[(1r,2r)-2-hydroxy-1-methyl-2-phosphonoethyl]-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[(1R,2R)-1-hydroxy-1-phosphono-propan-2-yl]sulfanyl-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: FFM
    structure: '[O-]C(=O)[C@H](CS[C@@H]([C@@H](P(=O)(O)[O-])O)C)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  FGP:
    id: FGP
    name: 2-amino-3-hydroxy-3-phosphonooxy-propionic acid
    synonyms:
    - S
    - (2S,3S)-2-azanyl-3-oxidanyl-3-phosphonooxy-propanoic acid
    - (3S)-3-(phosphonooxy)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: FGP
    structure: '[O-]C(=O)[C@H]([C@H](OP(=O)([O-])[O-])O)[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  FHL:
    id: FHL
    name: (e)-n~6~-[3-carboxy-1-(hydroxymethyl)propylidene]-l-lysine
    synonyms:
    - (2S)-2-amino-6-[(1,5-dihydroxy-5-oxo-pentan-2-ylidene)amino]hexanoic acid
    - K
    - (E)-N~6~-[3-carboxy-1-(hydroxymethyl)propylidene]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: FHL
    structure: OC/C(=N/CCCC[C@@H](C(=O)[O-])[NH3+])/CCC(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  FIO:
    id: FIO
    name: n~5~-[(1e)-2-fluoroethanimidoyl]-l-ornithine
    synonyms:
    - N~5~-[(1E)-2-fluoroethanimidoyl]-L-ornithine
    - (2S)-2-azanyl-5-(2-fluoranylethanimidoylamino)pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FIO
    structure: FCC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  FLA:
    id: FLA
    name: trifluoroalanine
    synonyms:
    - A
    - (2S)-2-amino-3,3,3-trifluoro-propanoic acid
    - 3,3,3-trifluoro-D-alanine
    identifiers:
    - ns: pdb-ccd
      id: FLA
    structure: N[C@H](C(F)(F)F)C(=O)[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  FLE:
    id: FLE
    name: furoyl-leucine
    synonyms:
    - N-(furan-2-ylcarbonyl)-L-leucine
    - (2S)-2-(furan-2-ylcarbonylamino)-4-methyl-pentanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: FLE
    structure: CC(C[C@@H](C(=O)[O-])NC(=O)c1ccco1)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  FLT:
    id: FLT
    name: fluoromalonyl tyrosine
    synonyms:
    - 2-[4-[(2S)-2-amino-3-hydroxy-3-oxo-propyl]phenoxy]-2-fluoro-propanedioic acid
    - '{4-[(2S)-2-amino-2-carboxyethyl]phenoxy}(fluoro)propanedioic acid'
    - Y
    identifiers:
    - ns: pdb-ccd
      id: FLT
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)OC(C(=O)[O-])(C(=O)[O-])F'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  FOE:
    id: FOE
    name: 2-(2-amino-3-oxo-propylsulfanyl)-n-(4-fluoro-phenyl)-n-isopropyl-acetamide
    synonyms:
    - S-{2-[(4-fluorophenyl)(1-methylethyl)amino]-2-oxoethyl}-L-cysteine
    - (2R)-2-amino-3-[2-[(4-fluorophenyl)-propan-2-yl-amino]-2-oxo-ethyl]sulfanyl-propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: FOE
    structure: CC(N(c1ccc(cc1)F)C(=O)CSC[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  FP9:
    id: FP9
    name: (4r)-4-fluoro-l-proline
    synonyms:
    - P
    - (2S,4R)-4-fluoranylpyrrolidine-2-carboxylic acid
    - (4R)-4-fluoro-L-proline
    identifiers:
    - ns: pdb-ccd
      id: FP9
    structure: '[O-]C(=O)[C@@H]1C[C@H](C[NH2+]1)F'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  FPK:
    id: FPK
    name: 1-formyl-l-proline
    synonyms:
    - P
    - (2S)-1-methanoylpyrrolidine-2-carboxylic acid
    - 1-formyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: FPK
    structure: O=CN1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
  FPR:
    id: FPR
    name: (3s)-3-amino-4-oxo-7-phenylheptanoic acid
    synonyms:
    - (3S)-3-amino-4-oxo-7-phenylheptanoic acid
    - (3S)-3-azanyl-4-oxo-7-phenyl-heptanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FPR
    structure: '[O-]C(=O)C[C@@H](C(=O)CCCc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  FRD:
    id: FRD
    name: 1-phenyl-2-aminopropane
    synonyms:
    - (2R)-1-phenylpropan-2-amine
    - X
    identifiers:
    - ns: pdb-ccd
      id: FRD
    structure: C[C@H](Cc1ccccc1)[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  FT6:
    id: FT6
    name: 6-fluoro-l-tryptophan
    synonyms:
    - (2S)-2-amino-3-(6-fluoro-1H-indol-3-yl)propanoic acid
    - 6-fluoro-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: FT6
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1ccc(c2)F)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  FTR:
    id: FTR
    name: fluorotryptophane
    synonyms:
    - 5-fluoro-L-tryptophan
    - (2S)-2-amino-3-(5-fluoro-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: FTR
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cc(F)cc2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  FTY:
    id: FTY
    name: deoxy-difluoromethelene-phosphotyrosine
    synonyms:
    - (2S)-2-amino-3-[4-(difluoro-phosphono-methyl)phenyl]propanoic acid
    - Y
    - 4-[difluoro(phosphono)methyl]-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: FTY
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)C(P(=O)([O-])[O-])(F)F)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  FVA:
    id: FVA
    name: n-formyl-l-valine
    synonyms:
    - V
    - N-formyl-L-valine
    - (2S)-2-formamido-3-methyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FVA
    structure: O=CN[C@H](C(=O)[O-])C(C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  FY2:
    id: FY2
    name: 2,3-difluoro-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[2,3-bis(fluoranyl)-4-oxidanyl-phenyl]propanoic acid
    - 2,3-difluoro-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: FY2
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1ccc(c(c1F)F)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  FY3:
    id: FY3
    name: 2,3,5-trifluoro-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[2,3,5-tris(fluoranyl)-4-oxidanyl-phenyl]propanoic acid
    - 2,3,5-trifluoro-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: FY3
    structure: '[NH3+][C@H](C(=O)[O-])Cc1cc(F)c(c(c1F)F)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  FZN:
    id: FZN
    name: (2s)-2-amino-6-{[(1z)-1-{[(2r,3r,4s,5r)-5-({[(r)-{[(r)-{[(2r,3s,4r,5r)-5-(6-amino-9h-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}(hydroxy)phosphoryl]oxy}methyl)-3,4-dihydroxytetrahydrofuran-2-yl]sulfanyl}ethylidene]amino}hexanoic
      acid
    synonyms:
    - (2S)-2-amino-6-[1-[(2R,3R,4S,5R)-5-[[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxymethyl]-3,4-dihydroxy-oxolan-2-yl]sulfanylethylideneamino]hexanoic
      acid
    - K
    - (2S)-2-amino-6-{[(1Z)-1-{[(2R,3R,4S,5R)-5-({[(R)-{[(R)-{[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}(hydroxy)phosphoryl]oxy}methyl)-3,4-dihydroxytetrahydrofuran-2-yl]sulfanyl}ethylidene]amino}hexanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: FZN
    structure: '[O-]C(=O)[C@H](CCCC/N=C(\S[C@H]1O[C@@H]([C@H]([C@H]1O)O)CO[P@](=O)(O[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])[O-])/C)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 57
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 57
    - molecule: Monomer
      element: H
      position: 57
      charge: 1
  G3M:
    id: G3M
    name: (3s)-n~6~-carbamimidoyl-3-hydroxy-l-lysine
    synonyms:
    - (2~{S},3~{S})-2-azanyl-6-carbamimidamido-3-oxidanyl-hexanoic acid
    - (3S)-N~6~-carbamimidoyl-3-hydroxy-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: G3M
    structure: O[C@H]([C@@H](C(=O)[O-])[NH3+])CCCNC(=[NH2+])N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  G8M:
    id: G8M
    name: (1s,2r)-2-[(s)-amino(carboxy)methyl]cyclobutanecarboxylic acid
    synonyms:
    - (1S,2R)-2-[(1S)-1-azanyl-2-oxidanyl-2-oxidanylidene-ethyl]cyclobutane-1-carboxylic
      acid
    - (1S,2R)-2-[(S)-amino(carboxy)methyl]cyclobutanecarboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: G8M
    structure: '[NH3+][C@@H]([C@@H]1CC[C@@H]1C(=O)[O-])C(=O)[O-]'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  GAU:
    id: GAU
    name: (4s)-4-amino-5-hydroxypentanoic acid
    synonyms:
    - (4S)-4-amino-5-hydroxypentanoic acid
    - E
    - (4S)-4-amino-5-hydroxy-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GAU
    structure: '[O-]C(=O)CC[C@H]([NH3+])CO'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  GEE:
    id: GEE
    name: ethyl glycinate
    synonyms:
    - ethyl 2-azanylethanoate
    - ethyl glycinate
    identifiers:
    - ns: pdb-ccd
      id: GEE
    structure: CCOC(=O)CN
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  GFT:
    id: GFT
    name: (2s)-2-azanyl-3-[cyclohexyloxy(methyl)phosphoryl]oxy-propanoic acid
    synonyms:
    - S
    - O-[(S)-(cyclohexyloxy)(methyl)phosphoryl]-L-serine
    - (2S)-2-azanyl-3-[cyclohexyloxy(methyl)phosphoryl]oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GFT
    structure: '[O-]C(=O)[C@H](CO[P@](=O)(OC1CCCCC1)C)[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  GHC:
    id: GHC
    name: n-({4-[(2-amino-6-ethyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidin-5-yl)sulfanyl]phenyl}carbonyl)-l-glutamic
      acid
    synonyms:
    - N-({4-[(2-amino-6-ethyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidin-5-yl)sulfanyl]phenyl}carbonyl)-L-glutamic
      acid
    - (2S)-2-[[4-[(2-amino-6-ethyl-4-oxo-3H-thieno[5,4-d]pyrimidin-5-yl)sulfanyl]phenyl]carbonylamino]pentanedioic
      acid
    identifiers:
    - ns: pdb-ccd
      id: GHC
    structure: CCc1sc2c(c1Sc1ccc(cc1)C(=O)N[C@H](C(=O)[O-])CCC(=O)[O-])c(=O)[nH]c(n2)N
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
  GHG:
    id: GHG
    name: (2s,4s)-2,5-diamino-4-hydroxy-5-oxopentanoic acid (non-preferred name)
    synonyms:
    - (2S,4S)-2,5-bis(azanyl)-4-hydroxy-5-oxo-pentanoic acid
    - Q
    - (2S,4S)-2,5-diamino-4-hydroxy-5-oxopentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: GHG
    structure: '[NH3+][C@H](C(=O)[O-])C[C@@H](C(=O)N)O'
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  GHW:
    id: GHW
    name: n-({4-[(2-amino-6-methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidin-5-yl)sulfanyl]phenyl}carbonyl)-l-glutamic
      acid
    synonyms:
    - (2S)-2-[[4-[(2-amino-6-methyl-4-oxo-3H-thieno[5,4-d]pyrimidin-5-yl)sulfanyl]phenyl]carbonylamino]pentanedioic
      acid
    - N-({4-[(2-amino-6-methyl-4-oxo-3,4-dihydrothieno[2,3-d]pyrimidin-5-yl)sulfanyl]phenyl}carbonyl)-L-glutamic
      acid
    identifiers:
    - ns: pdb-ccd
      id: GHW
    structure: '[O-]C(=O)CC[C@@H](C(=O)[O-])NC(=O)c1ccc(cc1)Sc1c(C)sc2c1c(=O)[nH]c(n2)N'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  GLJ:
    id: GLJ
    name: 5,5-dihydroxy-l-norvaline
    synonyms:
    - E
    - 5,5-dihydroxy-L-norvaline
    - (2S)-2-azanyl-5,5-dihydroxy-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GLJ
    structure: '[NH3+][C@H](C(=O)[O-])CCC(O)O'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  GLZ:
    id: GLZ
    name: amino-acetaldehyde
    synonyms:
    - G
    - 2-aminoethanal
    - aminoacetaldehyde
    identifiers:
    - ns: pdb-ccd
      id: GLZ
    structure: '[O-]C(=O)C[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  GME:
    id: GME
    name: 5-o-methyl-glutamic acid
    synonyms:
    - (2S)-2-azanyl-5-methoxy-5-oxo-pentanoic acid
    - (2S)-2-amino-5-methoxy-5-oxopentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: GME
    structure: COC(=O)CC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  GMO:
    id: GMO
    name: '{(4z)-2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-[(4-nitrophenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - '{(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-[(4-nitrophenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - 2-[(4~{Z})-2-[(1~{R},2~{R})-1-azanyl-2-oxidanyl-propyl]-4-[(4-nitrophenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: GMO
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2ccc(cc2)[N+](=O)[O-])/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  GNC:
    id: GNC
    name: n~2~-methyl-l-glutamine
    synonyms:
    - N~2~-methyl-L-glutamine
    - (2S)-5-azanyl-2-(methylamino)-5-oxidanylidene-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GNC
    structure: C[NH2+][C@H](C(=O)[O-])CCC(=O)N
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  GSC:
    id: GSC
    name: 2-ethylthio glycine
    synonyms:
    - G
    - (2S)-amino(ethylsulfanyl)ethanoic acid
    - (2S)-2-amino-2-ethylsulfanyl-ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GSC
    structure: '[O-]C(=O)[C@@H]([NH3+])SCC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  GSU:
    id: GSU
    name: o5'-(l-glutamyl-sulfamoyl)-adenosine
    synonyms:
    - E
    - 5'-O-(L-alpha-glutamylsulfamoyl)adenosine
    - (4S)-4-amino-5-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxysulfonylamino]-5-oxo-pentanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: GSU
    structure: '[O-]C(=O)CC[C@@H](C(=O)[N-]S(=O)(=O)OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)N'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  GT9:
    id: GT9
    name: s-nonyl-cysteine
    synonyms:
    - S-nonyl-L-cysteine
    - (2R)-2-amino-3-nonylsulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: GT9
    structure: CCCCCCCCCSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  GVL:
    id: GVL
    name: o-[(r)-{[(3r)-4-amino-3-hydroxy-2,2-dimethyl-4-oxobutyl]oxy}(hydroxy)phosphoryl]-l-serine
    synonyms:
    - O-[(R)-{[(3R)-4-amino-3-hydroxy-2,2-dimethyl-4-oxobutyl]oxy}(hydroxy)phosphoryl]-L-serine
    - S
    - (2S)-2-amino-3-[[(3R)-4-amino-3-hydroxy-2,2-dimethyl-4-oxo-butoxy]-hydroxy-phosphoryl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: GVL
    structure: '[NH3+][C@H](C(=O)[O-])COP(=O)(OCC([C@H](C(=O)N)O)(C)C)[O-]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  GZB:
    id: GZB
    name: 2-benzamidoethanoic acid
    synonyms:
    - 2-benzamidoethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GZB
    structure: O=C(c1ccccc1)NCC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  H14:
    id: H14
    name: (2s,3r)-beta-hydroxy-phenylalanine
    synonyms:
    - F
    - (betaR)-beta-hydroxy-L-phenylalanine
    - (2S,3R)-2-amino-3-hydroxy-3-phenyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: H14
    structure: O[C@@H]([C@@H](C(=O)[O-])[NH3+])c1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  H5M:
    id: H5M
    name: trans-3-hydroxy-5-methylproline
    synonyms:
    - P
    - (2S,3S,5S)-3-hydroxy-5-methyl-pyrrolidine-2-carboxylic acid
    - (3S,5S)-3-hydroxy-5-methyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: H5M
    structure: O[C@H]1C[C@@H]([NH2+][C@@H]1C(=O)[O-])C
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  H7V:
    id: H7V
    name: 3-cyclohexyl-n-methyl-l-alanine
    synonyms:
    - A
    - 3-cyclohexyl-N-methyl-L-alanine
    - (2~{S})-3-cyclohexyl-2-(methylamino)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: H7V
    structure: '[O-]C(=O)[C@H](CC1CCCCC1)[NH2+]C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  HAR:
    id: HAR
    name: n-omega-hydroxy-l-arginine
    synonyms:
    - N~5~-(N-hydroxycarbamimidoyl)-L-ornithine
    - (2S)-2-amino-5-[(N-hydroxycarbamimidoyl)amino]pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: HAR
    structure: ONC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  HBN:
    id: HBN
    name: n-(2-naphthyl)histidinamide
    synonyms:
    - 2-amino-3-(3H-imidazol-4-yl)-N-naphthalen-2-yl-propanamide
    - N-naphthalen-2-yl-D-histidinamide
    - H
    identifiers:
    - ns: pdb-ccd
      id: HBN
    structure: O=C(C(Cc1cnc[nH]1)[NH3+])Nc1ccc2c(c1)cccc2
    base_monomers:
    - H
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
  HCL:
    id: HCL
    name: (2s)-2-azanyl-2-[2-chloranyl-3,5-bis(oxidanyl)phenyl]ethanoic acid
    synonyms:
    - (2S)-2-azanyl-2-[2-chloranyl-3,5-bis(oxidanyl)phenyl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HCL
    structure: Oc1cc(O)c(c(c1)[C@@H](C(=O)[O-])[NH3+])Cl
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  HCM:
    id: HCM
    name: (2s)-2-amino-4-(methyldisulfanyl)butanoic acid
    synonyms:
    - (2S)-2-azanyl-4-(methyldisulfanyl)butanoic acid
    - (2S)-2-amino-4-(methyldisulfanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HCM
    structure: CSSCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  HCS:
    id: HCS
    name: 2-amino-4-mercapto-butyric acid
    synonyms:
    - (2S)-2-amino-4-sulfanyl-butanoic acid
    - X
    - L-homocysteine
    identifiers:
    - ns: pdb-ccd
      id: HCS
    structure: '[O-]C(=O)[C@@H]([NH3+])CCS'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  HG7:
    id: HG7
    name: (2s)-2-azanyl-n-[3-(dimethylamino)propyl]-2-(3-hydroxyphenyl)ethanamide
    synonyms:
    - (2S)-2-azanyl-N-[3-(dimethylamino)propyl]-2-(3-hydroxyphenyl)ethanamide
    identifiers:
    - ns: pdb-ccd
      id: HG7
    structure: C[NH+](CCCNC(=O)[C@H](c1cccc(c1)O)[NH3+])C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  HGL:
    id: HGL
    name: (2s)-2-amino-4-(2-amino-6-oxo-1,6-dihydro-9h-purin-9-yl)butanoic acid
    synonyms:
    - (2S)-2-amino-4-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)butanoic acid
    - X
    - (2S)-2-amino-4-(2-amino-6-oxo-1H-purin-9-yl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HGL
    structure: '[O-]C(=O)[C@H](CCn1cnc2c1nc(N)[nH]c2=O)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  HHK:
    id: HHK
    name: (2s)-2,8-diaminooctanoic acid
    synonyms:
    - AK
    - (2S)-2,8-diaminooctanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HHK
    structure: '[NH3+]CCCCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  HIX:
    id: HIX
    name: 3-(1h-1,2,3-triazol-5-yl)-l-alanine
    synonyms:
    - 3-(1H-1,2,3-triazol-5-yl)-L-alanine
    - (2S)-2-azanyl-3-(1H-1,2,3-triazol-5-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HIX
    structure: '[O-]C(=O)[C@H](Cc1cnn[nH]1)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  HL2:
    id: HL2
    name: (2s,3r)-2-amino-3-hydroxy-4-methylpentanoic acid
    synonyms:
    - (2S,3R)-2-amino-3-hydroxy-4-methylpentanoic acid (non-preferred name)
    - (2S,3R)-2-azanyl-3-hydroxy-4-methyl-pentanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: HL2
    structure: CC([C@H]([C@@H](C(=O)[O-])[NH3+])O)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  HLU:
    id: HLU
    name: beta-hydroxyleucine
    synonyms:
    - (2S,3S)-2-amino-3-hydroxy-4-methyl-pentanoic acid
    - (2S,3S)-2-amino-3-hydroxy-4-methylpentanoic acid (non-preferred name)
    - L
    identifiers:
    - ns: pdb-ccd
      id: HLU
    structure: CC([C@@H]([C@@H](C(=O)[O-])[NH3+])O)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  HLX:
    id: HLX
    name: 5-methyl-l-norleucine
    synonyms:
    - (2S)-2-azanyl-5-methyl-hexanoic acid
    - 5-methyl-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: HLX
    structure: '[NH3+][C@H](C(=O)[O-])CCC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  HLY:
    id: HLY
    name: (3~{r})-5-[[(5~{s})-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]amino]-3-methyl-3-oxidanyl-5-oxidanylidene-pentanoic
      acid
    synonyms:
    - (3~{R})-5-[[(5~{S})-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]amino]-3-methyl-3-oxidanyl-5-oxidanylidene-pentanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: HLY
    structure: O=C(C[C@](CC(=O)[O-])(O)C)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  HM8:
    id: HM8
    name: 2-[(1s,2r)-1-amino-2-(sulfooxy)propyl]-5-hydroxy-1,3-oxazole-4-carbothioic
      o-acid
    synonyms:
    - 2-[(1S,2R)-1-azanyl-2-sulfooxy-propyl]-5-hydroxy-1,3-oxazole-4-carbothioic O-acid
    - 2-[(1S,2R)-1-amino-2-(sulfooxy)propyl]-5-hydroxy-1,3-oxazole-4-carbothioic O-acid
    identifiers:
    - ns: pdb-ccd
      id: HM8
    structure: C[C@H]([C@@H](c1oc(c(n1)C(=S)O)[O-])N)OS(=O)(=O)[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
  HM9:
    id: HM9
    name: 6-(3-carbamimidamidopropyl)-3,5-dihydroxypyrazine-2-carbothioic s-acid
    synonyms:
    - 6-(3-carbamimidamidopropyl)-3,5-dihydroxypyrazine-2-carbothioic S-acid
    - 6-(3-carbamimidamidopropyl)-3,5-dihydroxy-pyrazine-2-carbothioic S-acid
    identifiers:
    - ns: pdb-ccd
      id: HM9
    structure: Oc1nc(O)c(nc1CCCNC(=[NH2+])N)C(=O)[S-]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
  HMR:
    id: HMR
    name: beta-homoarginine
    synonyms:
    - (3S)-3-amino-6-carbamimidamidohexanoic acid
    - (3S)-3-amino-6-carbamimidamido-hexanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: HMR
    structure: '[O-]C(=O)C[C@H](CCCNC(=[NH2+])N)[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  HNC:
    id: HNC
    name: s-[(1s,2r)-2-hydroxy-1-(2-oxoethyl)heptyl]-l-cysteine
    synonyms:
    - S-[(3S,4R)-4-hydroxy-1-oxononan-3-yl]-L-cysteine
    - (2R)-2-azanyl-3-[(3S,4R)-4-hydroxy-1-oxo-nonan-3-yl]sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HNC
    structure: CCCCC[C@H]([C@@H](SC[C@@H](C(=O)[O-])[NH3+])CC=O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  HOX:
    id: HOX
    name: 4-amino-l-phenylalanine
    synonyms:
    - 4-amino-L-phenylalanine
    - (2S)-3-(4-aminophenyl)-2-azanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HOX
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)N'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  HPE:
    id: HPE
    name: homophenylalanine
    synonyms:
    - F
    - (2S)-2-amino-4-phenylbutanoic acid
    - (2S)-2-amino-4-phenyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HPE
    structure: '[NH3+][C@H](C(=O)[O-])CCc1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  HPQ:
    id: HPQ
    name: homophenylalaninylmethane
    synonyms:
    - F
    - (3S)-3-amino-5-phenyl-pentan-2-one
    - (3S)-3-amino-5-phenylpentan-2-one
    identifiers:
    - ns: pdb-ccd
      id: HPQ
    structure: '[NH3+][C@H](C(=O)C)CCc1ccccc1'
    base_monomers:
    - F
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  HQA:
    id: HQA
    name: 3-(8-hydroxyquinolin-3-yl)-l-alanine
    synonyms:
    - A
    - 3-(8-hydroxyquinolin-3-yl)-L-alanine
    - (2S)-2-amino-3-(8-hydroxyquinolin-3-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HQA
    structure: '[O-]C(=O)[C@H](Cc1cnc2c(c1)cccc2O)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  HR7:
    id: HR7
    name: (3s)-3-amino-6-[(diaminomethylidene)amino]hexanoic acid
    synonyms:
    - (3S)-3-amino-6-[(diaminomethylidene)amino]hexanoic acid
    - (3S)-3-azanyl-6-[bis(azanyl)methylideneamino]hexanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: HR7
    structure: '[O-]C(=O)C[C@H](CCC[NH+]=C(N)N)[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  HRG:
    id: HRG
    name: l-homoarginine
    synonyms:
    - N~6~-carbamimidoyl-L-lysine
    - (2S)-2-amino-6-carbamimidamido-hexanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: HRG
    structure: NC(=[NH2+])NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  HRP:
    id: HRP
    name: 5-hydroxy-l-tryptophan
    synonyms:
    - 5-hydroxy-D-tryptophan
    - (2R)-2-amino-3-(5-hydroxy-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: HRP
    structure: '[O-]C(=O)[C@H]([NH3+])Cc1c[nH]c2c1cc(O)cc2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  HS8:
    id: HS8
    name: 3-(1-sulfo-1h-imidazol-3-ium-4-yl)-l-alanine
    synonyms:
    - 3-(1-sulfo-1H-imidazol-3-ium-4-yl)-L-alanine
    - (2S)-2-amino-3-(1-sulfoimidazol-3-ium-4-yl)propanoic acid
    - H
    identifiers:
    - ns: pdb-ccd
      id: HS8
    structure: '[O-]C(=O)[C@H](Cc1ncn(c1)S(=O)(=O)[O-])[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  HS9:
    id: HS9
    name: n-alpha-methyl-l-histidinamide
    synonyms:
    - (2S)-3-(1H-imidazol-4-yl)-2-methylamino-propanamide
    - Nalpha-methyl-L-histidinamide
    - H
    identifiers:
    - ns: pdb-ccd
      id: HS9
    structure: C[NH2+][C@H](C(=O)N)Cc1c[nH]cn1
    base_monomers:
    - H
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  HSE:
    id: HSE
    name: l-homoserine
    synonyms:
    - S
    - (2S)-2-amino-4-hydroxy-butanoic acid
    - L-homoserine
    identifiers:
    - ns: pdb-ccd
      id: HSE
    structure: '[O-]C(=O)[C@@H]([NH3+])CCO'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  HSK:
    id: HSK
    name: 3-hydroxy-l-histidine
    synonyms:
    - (2S)-2-azanyl-3-(3-oxidanylimidazol-4-yl)propanoic acid
    - 3-hydroxy-L-histidine
    identifiers:
    - ns: pdb-ccd
      id: HSK
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1cncn1O'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  HSL:
    id: HSL
    name: homoserine lactone
    synonyms:
    - S
    - (3S)-3-aminodihydrofuran-2(3H)-one
    - (3S)-3-aminooxolan-2-one
    identifiers:
    - ns: pdb-ccd
      id: HSL
    structure: O=C1OCC[C@@H]1[NH3+]
    base_monomers:
    - S
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  HSO:
    id: HSO
    name: l-histidinol
    synonyms:
    - 4-[(2S)-2-amino-3-hydroxypropyl]-1H-imidazol-3-ium
    - H
    - (2S)-2-azanyl-3-(1H-imidazol-3-ium-4-yl)propan-1-ol
    identifiers:
    - ns: pdb-ccd
      id: HSO
    structure: OC[C@@H]([NH3+])Cc1c[nH]cn1
    base_monomers:
    - H
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  HSV:
    id: HSV
    name: l-histidinal
    synonyms:
    - 4-[(2S)-2-amino-3-oxopropyl]-1H-imidazol-3-ium
    - H
    - (2S)-2-azanyl-3-(1H-imidazol-3-ium-4-yl)propanal
    identifiers:
    - ns: pdb-ccd
      id: HSV
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]cn1'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  HT7:
    id: HT7
    name: (3s)-3-amino-4-(1h-indol-3-yl)butanoic acid
    synonyms:
    - (3S)-3-azanyl-4-(1H-indol-3-yl)butanoic acid
    - (3S)-3-amino-4-(1H-indol-3-yl)butanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: HT7
    structure: '[O-]C(=O)C[C@H](Cc1c[nH]c2c1cccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  HTI:
    id: HTI
    name: (4s)-4-{[(2s)-2-amino-3-oxopropyl]sulfanyl}-l-homoserine
    synonyms:
    - (4R)-4-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}-L-homoserine
    - (2S,4R)-2-amino-4-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanyl-4-hydroxy-butanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: HTI
    structure: O[C@@H](C[C@@H](C(=O)[O-])[NH3+])SC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  HZP:
    id: HZP
    name: (4s)-4-hydroxy-l-proline
    synonyms:
    - P
    - (2S,4S)-4-hydroxypyrrolidine-2-carboxylic acid
    - (4S)-4-hydroxy-L-proline
    identifiers:
    - ns: pdb-ccd
      id: HZP
    structure: '[O-]C(=O)[C@@H]1C[C@@H](C[NH2+]1)O'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  I2M:
    id: I2M
    name: 3-methyl-l-alloisoleucine
    synonyms:
    - 3-methyl-L-alloisoleucine
    - (2S)-2-amino-3,3-dimethyl-pentanoic acid
    - I
    identifiers:
    - ns: pdb-ccd
      id: I2M
    structure: CCC([C@@H](C(=O)[O-])[NH3+])(C)C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  I4G:
    id: I4G
    name: n-(2-methylpropyl)glycine
    synonyms:
    - 2-(2-methylpropylamino)ethanoic acid
    - N-(2-methylpropyl)glycine
    identifiers:
    - ns: pdb-ccd
      id: I4G
    structure: CC(C[NH2+]CC(=O)[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  I58:
    id: I58
    name: 4r-fluoro-n6-ethanimidoyl-l-lysine
    synonyms:
    - (2S,4R)-2-amino-6-(ethanimidoylamino)-4-fluoro-hexanoic acid
    - K
    - (4R)-N~6~-[(1Z)-ethanimidoyl]-4-fluoro-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: I58
    structure: F[C@@H](C[C@@H](C(=O)[O-])[NH3+])CCNC(=[NH2+])C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  IAM:
    id: IAM
    name: 4-[(isopropylamino)methyl]phenylalanine
    synonyms:
    - A
    - 4-{[(1-methylethyl)amino]methyl}-L-phenylalanine
    - (2S)-2-amino-3-[4-[(propan-2-ylamino)methyl]phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: IAM
    structure: CC([NH2+]Cc1ccc(cc1)C[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  ICY:
    id: ICY
    name: s-(2-iodobenzyl)-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[(2-iodophenyl)methylsulfanyl]propanoic acid
    - S-(2-iodobenzyl)-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: ICY
    structure: '[O-]C(=O)[C@H](CSCc1ccccc1I)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  IEL:
    id: IEL
    name: n~6~-[(1z)-ethanimidoyl]-l-lysine
    synonyms:
    - N~6~-[(1Z)-ethanimidoyl]-L-lysine
    - K
    - (2S)-2-amino-6-(ethanimidoylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: IEL
    structure: CC(=[NH2+])NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  IEY:
    id: IEY
    name: 2-((1e)-2-(5-imidazolyl)ethenyl)-4-(p-hydroxybenzylidene)-5-imidazolinone
    synonyms:
    - 2-[5-hydroxy-4-[(4-hydroxyphenyl)methyl]-2-[(E)-2-(1H-imidazol-4-yl)ethenyl]imidazol-1-yl]ethanoic
      acid
    - HYG
    - '{5-hydroxy-4-(4-hydroxybenzyl)-2-[(E)-2-(1H-imidazol-4-yl)ethenyl]-1H-imidazol-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: IEY
    structure: '[O-]C(=O)Cn1c(/C=C/c2c[nH]cn2)[nH+]c(c1O)Cc1ccc(cc1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  IGL:
    id: IGL
    name: alpha-amino-2-indanacetic acid
    synonyms:
    - G
    - (2R)-2-amino-2-(2,3-dihydro-1H-inden-2-yl)ethanoic acid
    - (2R)-amino(2,3-dihydro-1H-inden-2-yl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: IGL
    structure: '[NH3+][C@@H](C(=O)[O-])C1Cc2c(C1)cccc2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  IIC:
    id: IIC
    name: 4-imidazolmethylene-5-imidazolone chromophore
    synonyms:
    - SHG
    - 2-[2-[(1R)-1-amino-2-hydroxy-ethyl]-4-(3H-imidazol-4-ylmethyl)-5-oxo-2H-imidazol-1-yl]ethanoic
      acid
    - '[(2S)-2-[(1R)-1-amino-2-hydroxyethyl]-4-(1H-imidazol-5-ylmethyl)-5-oxo-2,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: IIC
    structure: OC[C@@H](C1N=C(C(=O)N1CC(=O)[O-])Cc1cnc[nH]1)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  IIL:
    id: IIL
    name: iso-isoleucine
    synonyms:
    - (2S,3R)-2-amino-3-methyl-pentanoic acid
    - L-alloisoleucine
    - I
    identifiers:
    - ns: pdb-ccd
      id: IIL
    structure: CC[C@H]([C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  ILM:
    id: ILM
    name: methyl l-isoleucinate
    synonyms:
    - methyl L-isoleucinate
    - methyl (2S,3S)-2-azanyl-3-methyl-pentanoate
    identifiers:
    - ns: pdb-ccd
      id: ILM
    structure: CC[C@@H]([C@@H](C(=O)OC)[NH3+])C
    base_monomers:
    - I
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  IOR:
    id: IOR
    name: n~5~-[(5r)-5-methyl-4-oxo-4,5-dihydro-1h-imidazol-2-yl]-l-ornithine
    synonyms:
    - N~5~-[(5R)-5-methyl-4-oxo-4,5-dihydro-1H-imidazol-2-yl]-L-ornithine
    - (2S)-2-azanyl-5-[[(5R)-5-methyl-4-oxidanylidene-1,5-dihydroimidazol-2-yl]amino]pentanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: IOR
    structure: '[O-]C(=O)[C@H](CCCNC1=[NH+]C(=O)[C@H](N1)C)[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  IPG:
    id: IPG
    name: n-isopropyl glycine
    synonyms:
    - G
    - N-(1-methylethyl)glycine
    - 2-(propan-2-ylamino)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: IPG
    structure: CC([NH2+]CC(=O)[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
    - molecule: Monomer
      element: H
      position: 3
      charge: 1
  IZO:
    id: IZO
    name: (2s)-2-aminohex-5-ynoic acid
    synonyms:
    - M
    - (2S)-2-aminohex-5-ynoic acid
    identifiers:
    - ns: pdb-ccd
      id: IZO
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC#C'
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  J9Y:
    id: J9Y
    name: (2s)-2-amino-5-{[(e)-amino(methylamino)methylidene](hydroxy)azaniumyl}pentanoate
    synonyms:
    - (2~{S})-2-azanyl-5-[(~{E})-[azanyl(methylamino)methylidene]-oxidanyl-azaniumyl]pentanoate
    - (2S)-2-amino-5-{[(E)-amino(methylamino)methylidene](hydroxy)azaniumyl}pentanoate
    identifiers:
    - ns: pdb-ccd
      id: J9Y
    structure: CN/C(=[N+](\CCC[C@@H](C(=O)[O-])[NH3+])/[O-])/[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  JJJ:
    id: JJJ
    name: s-(pyridin-3-ylcarbonyl)-l-cysteine
    synonyms:
    - S-(pyridin-3-ylcarbonyl)-L-cysteine
    - C
    - (2R)-2-azanyl-3-pyridin-3-ylcarbonylsulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: JJJ
    structure: '[O-]C(=O)[C@H](CSC(=O)c1cccnc1)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  JJK:
    id: JJK
    name: s-[(s)-hydroxy(pyridin-3-yl)methyl]-l-cysteine
    synonyms:
    - S-[(S)-hydroxy(pyridin-3-yl)methyl]-L-cysteine
    - (2R)-2-azanyl-3-[(S)-hydroxy(pyridin-3-yl)methyl]sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: JJK
    structure: '[O-]C(=O)[C@H](CS[C@@H](c1cccnc1)O)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  JJL:
    id: JJL
    name: s-[(s)-hydroxy(5-methoxypyridin-3-yl)methyl]-l-cysteine
    synonyms:
    - (2R)-2-azanyl-3-[(S)-hydroxy-(5-methoxypyridin-3-yl)methyl]sulfanyl-propanoic
      acid
    - S-[(S)-hydroxy(5-methoxypyridin-3-yl)methyl]-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: JJL
    structure: COc1cncc(c1)[C@H](SC[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  K1R:
    id: K1R
    name: (2s)-2-amino-4-[({[(2r)-2-amino-2-carboxyethyl]thio}amino)sulfinyl]butanoic
      acid
    synonyms:
    - (2S)-2-amino-4-[(R)-({[(2R)-2-amino-2-carboxyethyl]sulfanyl}amino)sulfinyl]butanoic
      acid
    - C
    - (2S)-2-amino-4-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanylsulfinamoyl-butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: K1R
    structure: O=[S@](CC[C@@H](C(=O)[O-])[NH3+])NSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  K5L:
    id: K5L
    name: (2~{r})-2-azanyl-3-(3-oxidanyl-3-oxidanylidene-propanoyl)oxy-propanoic acid
    synonyms:
    - S
    - (2~{R})-2-azanyl-3-(3-oxidanyl-3-oxidanylidene-propanoyl)oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: K5L
    structure: '[O-]C(=O)CC(=O)OC[C@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  KBE:
    id: KBE
    name: beta-lysine
    synonyms:
    - (3S)-3,6-bis(azanyl)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: KBE
    structure: '[NH3+]CCC[C@@H](CC(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  KCR:
    id: KCR
    name: n-6-crotonyl-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[[(E)-but-2-enoyl]amino]hexanoic acid
    - N~6~-[(2E)-but-2-enoyl]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: KCR
    structure: C/C=C/C(=O)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  KEO:
    id: KEO
    name: e(r)-beta-lysyl-hydroxylysine
    synonyms:
    - (2~{S},4~{S})-2-azanyl-6-[[(3~{S})-3,6-bis(azanyl)hexanoyl]amino]-4-oxidanyl-hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: KEO
    structure: '[NH3+]CCC[C@@H](CC(=O)NCC[C@@H](C[C@@H](C(=O)[O-])[NH3+])O)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  KGC:
    id: KGC
    name: n~6~-[(2r)-2-carboxy-5-oxotetrahydrofuran-2-yl]-l-lysine
    synonyms:
    - K
    - N~6~-[(2R)-2-carboxy-5-oxotetrahydrofuran-2-yl]-L-lysine
    - (2R)-2-[[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]amino]-5-oxo-oxolane-2-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: KGC
    structure: O=C1CC[C@](O1)(NCCCC[C@@H](C(=O)[O-])[NH3+])C(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  KHB:
    id: KHB
    name: n~6~-[(3s)-3-hydroxybutanoyl]-l-lysine
    synonyms:
    - N~6~-[(3S)-3-hydroxybutanoyl]-L-lysine
    - (2~{S})-2-azanyl-6-[[(3~{S})-3-oxidanylbutanoyl]amino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: KHB
    structure: C[C@@H](CC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  KNB:
    id: KNB
    name: 3-(methylsulfonyl)-l-alanine
    synonyms:
    - A
    - (2R)-2-azanyl-3-methylsulfonyl-propanoic acid
    - 3-(methylsulfonyl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: KNB
    structure: '[O-]C(=O)[C@H](CS(=O)(=O)C)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  KOR:
    id: KOR
    name: l-homocysteine-s-n-s-l-cysteine
    synonyms:
    - M
    - (2S)-2-amino-4-[[(R)-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfinyl]amino]sulfanyl-butanoic
      acid
    - S-({(R)-[(2R)-2-amino-2-carboxyethyl]sulfinyl}amino)-L-homocysteine
    identifiers:
    - ns: pdb-ccd
      id: KOR
    structure: O=[S@](C[C@@H](C(=O)[O-])[NH3+])[N-]SCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  KPF:
    id: KPF
    name: n-(1-carboxy-2-fluoro-ethenyl) lysine
    synonyms:
    - (2S)-2-azanyl-6-[(Z)-(3-fluoranyl-1-oxidanyl-1-oxidanylidene-propan-2-ylidene)amino]hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: KPF
    structure: FC/C(=N\CCCC[C@@H](C(=O)[O-])[NH3+])/C(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
  KPY:
    id: KPY
    name: (2r)-2-azanyl-3-[2-[(e)-(1-oxidanyl-1-oxidanylidene-propan-2-ylidene)amino]ethylsulfanyl]propanoic
      acid
    synonyms:
    - (2R)-2-azanyl-3-[2-[(E)-(1-oxidanyl-1-oxidanylidene-propan-2-ylidene)amino]ethylsulfanyl]propanoic
      acid
    - K
    - S-{2-[(E)-(1-carboxyethylidene)amino]ethyl}-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: KPY
    structure: '[NH3+][C@H](C(=O)[O-])CSCC/N=C(/C(=O)[O-])\C'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  KST:
    id: KST
    name: n~6~-(5-carboxy-3-thienyl)-l-lysine
    synonyms:
    - K
    - 4-[[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]amino]thiophene-2-carboxylic acid
    - N~6~-(5-carboxythiophen-3-yl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: KST
    structure: '[NH3+][C@H](C(=O)[O-])CCCCNc1csc(c1)C(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  KWS:
    id: KWS
    name: '{2-[(1r,2r)-1-amino-2-hydroxypropyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - '{2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-methylidene-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - 2-[2-[(1R,2R)-1-azanyl-2-oxidanyl-propyl]-4-methylidene-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: KWS
    structure: '[O-]C(=O)CN1C(=O)C(=C)N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  KYN:
    id: KYN
    name: (2s)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid
    synonyms:
    - (2S)-4-(2-aminophenyl)-2-azanyl-4-oxidanylidene-butanoic acid
    - (2S)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: KYN
    structure: '[O-]C(=O)[C@H](CC(=O)c1ccccc1N)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  KYQ:
    id: KYQ
    name: (e)-n~6~-(1-carboxy-2-hydroxyethylidene)-l-lysine
    synonyms:
    - (E)-N~6~-(1-carboxy-2-hydroxyethylidene)-L-lysine
    - (2S)-2-amino-6-[(1,3-dihydroxy-1-oxo-propan-2-ylidene)amino]hexanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: KYQ
    structure: OC/C(=N\CCCC[C@@H](C(=O)[O-])[NH3+])/C(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
  L2A:
    id: L2A
    name: (2s,5s,8s,11s,15e,20s)-20-amino-2-(carboxymethyl)-11,20-dimethyl-5,8-bis(2-methylpropyl)-3,6,9,21-tetraoxo-1,4,7,10-tetraazacyclohenicos-15-ene-11-carboxylic
      acid
    synonyms:
    - (2S,5S,8S,11S,15E,20S)-20-amino-2-(carboxymethyl)-11,20-dimethyl-5,8-bis(2-methylpropyl)-3,6,9,21-tetraoxo-1,4,7,10-tetraazacyclohenicos-15-ene-11-carboxylic
      acid
    - (2S,5S,8S,11S,15E,20S)-20-amino-2-(carboxymethyl)-11,20-dimethyl-5,8-bis(2-methylpropyl)-3,6,9,21-tetraoxo-1,4,7,10-tetrazacyclohenicos-15-ene-11-carboxylic
      acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: L2A
    structure: CC(C[C@@H]1NC(=O)[C@H](CC(=O)[O-])NC(=O)[C@@](C)([NH3+])CCC/C=C/CCC[C@@](NC(=O)[C@@H](NC1=O)CC(C)C)(C)C(=O)[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 46
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 33
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 48
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 33
  L3O:
    id: L3O
    name: (2s,3s)-3-amino-2-hydroxy-5-methylhexanoic acid
    synonyms:
    - (2S,3S)-3-amino-2-hydroxy-5-methyl-hexanoic acid
    - L
    - (2S,3S)-3-amino-2-hydroxy-5-methylhexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: L3O
    structure: '[NH3+][C@H]([C@@H](C(=O)[O-])O)CC(C)C'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  L5P:
    id: L5P
    name: (2s)-2-azanyl-6-[[(3r,4r)-3,4-bis(oxidanyl)-2-oxidanylidene-5-phosphonooxy-pentyl]amino]hexanoic
      acid
    synonyms:
    - (2S)-2-azanyl-6-[[(3R,4R)-3,4-bis(oxidanyl)-2-oxidanylidene-5-phosphonooxy-pentyl]amino]hexanoic
      acid
    - (2S)-2-amino-6-{[(3R,4R)-3,4-dihydroxy-2-oxo-5-(phosphonooxy)pentyl]amino}hexanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: L5P
    structure: O[C@@H]([C@H](C(=O)C[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+])O)COP(=O)([O-])[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  LA2:
    id: LA2
    name: n~6~-[(6r)-6,8-disulfanyloctanoyl]-l-lysine
    synonyms:
    - N~6~-[(6R)-6,8-disulfanyloctanoyl]-L-lysine
    - (2S)-2-amino-6-[[(6R)-6,8-bis-sulfanyloctanoyl]amino]hexanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: LA2
    structure: SCC[C@@H](CCCCC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+])S
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  LAY:
    id: LAY
    name: n-acetyl-l-leucine
    synonyms:
    - N-acetyl-L-leucine
    - L
    - (2S)-2-acetamido-4-methyl-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LAY
    structure: CC(C[C@@H](C(=O)[O-])NC(=O)C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  LBY:
    id: LBY
    name: n~6~-(tert-butoxycarbonyl)-l-lysine
    synonyms:
    - N~6~-(tert-butoxycarbonyl)-L-lysine
    - K
    - (2S)-2-azanyl-6-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LBY
    structure: O=C(OC(C)(C)C)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  LCK:
    id: LCK
    name: (z)-n~6~-(2-carboxy-1-methylethylidene)-l-lysine
    synonyms:
    - (2S)-2-amino-6-[(4-hydroxy-4-oxo-butan-2-ylidene)amino]hexanoic acid
    - (Z)-N~6~-(2-carboxy-1-methylethylidene)-L-lysine
    - K
    identifiers:
    - ns: pdb-ccd
      id: LCK
    structure: '[O-]C(=O)C/C(=[NH+]\CCCC[C@@H](C(=O)[O-])[NH3+])/C'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LDH:
    id: LDH
    name: n~6~-ethyl-l-lysine
    synonyms:
    - K
    - (2S)-2-amino-6-ethylamino-hexanoic acid
    - N~6~-ethyl-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: LDH
    structure: CC[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  LE1:
    id: LE1
    name: 3-sulfanyl-l-valine
    synonyms:
    - 3-sulfanyl-L-valine
    - (2R)-2-amino-3-methyl-3-sulfanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LE1
    structure: '[NH3+][C@@H](C(S)(C)C)C(=O)[O-]'
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  LEF:
    id: LEF
    name: (4s)-5-fluoro-l-leucine
    synonyms:
    - (4S)-5-fluoro-L-leucine
    - (2S,4S)-2-amino-5-fluoro-4-methyl-pentanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: LEF
    structure: FC[C@H](C[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  LEH:
    id: LEH
    name: n-[12-(1h-imidazol-1-yl)dodecanoyl]-l-leucine
    synonyms:
    - N-[12-(1H-imidazol-1-yl)dodecanoyl]-L-leucine
    - (2S)-2-(12-imidazol-1-yldodecanoylamino)-4-methyl-pentanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: LEH
    structure: CC(C[C@@H](C(=O)[O-])NC(=O)CCCCCCCCCCCn1ccnc1)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  LEN:
    id: LEN
    name: 3-methylbutan-1-amine
    synonyms:
    - 3-methylbutan-1-amine
    - L
    identifiers:
    - ns: pdb-ccd
      id: LEN
    structure: '[NH3+]CCC(C)C'
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  LET:
    id: LET
    name: (z)-n^6-{3-carboxy-1-[(4-carboxy-2-oxobutoxy)methyl]propylidene}-l-lysine
    synonyms:
    - (2S)-2-amino-6-[[5-hydroxy-1-(5-hydroxy-2,5-dioxo-pentoxy)-5-oxo-pentan-2-ylidene]amino]hexanoic
      acid
    - (E)-N~6~-{3-carboxy-1-[(4-carboxy-2-oxobutoxy)methyl]propylidene}-L-lysine
    - K
    identifiers:
    - ns: pdb-ccd
      id: LET
    structure: '[O-]C(=O)CC/C(=N\CCCC[C@@H](C(=O)[O-])[NH3+])/COCC(=O)CCC(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LGY:
    id: LGY
    name: (e)-n~6~-(4-oxobutylidene)-l-lysine
    synonyms:
    - (E)-N~6~-(4-oxobutylidene)-L-lysine
    - (2S)-2-azanyl-6-[(E)-4-oxobutylideneamino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LGY
    structure: O=CCC/C=[NH+]/CCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LHC:
    id: LHC
    name: (2s)-2-amino-4-(4-amino-2-oxopyrimidin-1(2h)-yl)butanoic acid
    synonyms:
    - (2S)-2-amino-4-(4-amino-2-oxopyrimidin-1(2H)-yl)butanoic acid
    - X
    - (2S)-2-amino-4-(4-amino-2-oxo-pyrimidin-1-yl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LHC
    structure: '[O-]C(=O)[C@@H]([NH3+])CCn1ccc(nc1=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  LLO:
    id: LLO
    name: n~6~-[(1s)-3-hydroxy-1,3-dimethylbutyl]-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[[(2S)-4-hydroxy-4-methyl-pentan-2-yl]amino]hexanoic acid
    - N~6~-[(2S)-4-hydroxy-4-methylpentan-2-yl]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: LLO
    structure: '[O-]C(=O)[C@H](CCCC[NH2+][C@H](CC(O)(C)C)C)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  LLY:
    id: LLY
    name: nz-(dicarboxymethyl)lysine
    synonyms:
    - '{[(5S)-5-amino-5-carboxypentyl]amino}propanedioic acid'
    - 2-[[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]amino]propanedioic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: LLY
    structure: '[O-]C(=O)[C@H](CCCC[NH2+]C(C(=O)[O-])C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  LLZ:
    id: LLZ
    name: n~6~-[(1s)-3-(6-methoxynaphthalen-2-yl)-1-methyl-3-oxopropyl]-l-lysine
    synonyms:
    - N~6~-[(2S)-4-(6-methoxynaphthalen-2-yl)-4-oxobutan-2-yl]-L-lysine
    - (2S)-2-azanyl-6-[[(2S)-4-(6-methoxynaphthalen-2-yl)-4-oxo-butan-2-yl]amino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: LLZ
    structure: COc1ccc2c(c1)ccc(c2)C(=O)C[C@@H]([NH2+]CCCC[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  LME:
    id: LME
    name: (2s,3r)-2-azanyl-3-methyl-pentanedioic acid
    synonyms:
    - (2S,3R)-2-azanyl-3-methyl-pentanedioic acid
    - E
    - (3R)-3-methyl-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: LME
    structure: '[O-]C(=O)C[C@H]([C@@H](C(=O)[O-])[NH3+])C'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  LMQ:
    id: LMQ
    name: (3s)-3-methyl-l-glutamine
    synonyms:
    - (3S)-3-methyl-L-glutamine
    - Q
    - (2S,3S)-2,5-diamino-3-methyl-5-oxo-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LMQ
    structure: NC(=O)C[C@@H]([C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  LNE:
    id: LNE
    name: n-ethyl-l-leucinamide
    synonyms:
    - (2S)-2-azanyl-N-ethyl-4-methyl-pentanamide
    - N-ethyl-L-leucinamide
    identifiers:
    - ns: pdb-ccd
      id: LNE
    structure: CCNC(=O)[C@H](CC(C)C)[NH3+]
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  LNM:
    id: LNM
    name: n-methyl-l-leucinamide
    synonyms:
    - (2S)-2-azanyl-N,4-dimethyl-pentanamide
    - N-methyl-L-leucinamide
    identifiers:
    - ns: pdb-ccd
      id: LNM
    structure: CNC(=O)[C@H](CC(C)C)[NH3+]
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
  LP6:
    id: LP6
    name: 6-piperidin-1-yl-l-norleucine
    synonyms:
    - 6-piperidin-1-yl-L-norleucine
    - K
    - (2S)-2-amino-6-piperidin-1-yl-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LP6
    structure: '[O-]C(=O)[C@H](CCCC[NH+]1CCCCC1)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LPG:
    id: LPG
    name: l-propargylglycine
    synonyms:
    - G
    - (2S)-2-aminobut-3-ynoic acid
    identifiers:
    - ns: pdb-ccd
      id: LPG
    structure: '[O-]C(=O)[C@@H]([NH3+])C#C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  LPH:
    id: LPH
    name: l-propargylglycine
    synonyms:
    - (2S)-2-aminopent-4-ynoic acid
    - (2S)-2-azanylpent-4-ynoic acid
    identifiers:
    - ns: pdb-ccd
      id: LPH
    structure: '[O-]C(=O)[C@@H]([NH3+])CC#C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  LPL:
    id: LPL
    name: leu-hydroxyethylene-leu
    synonyms:
    - (2R,4S,5S)-5-amino-4-hydroxy-7-methyl-2-(2-methylpropyl)octanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: LPL
    structure: CC(C[C@@H]([C@H](C[C@H](C(=O)[O-])CC(C)C)O)[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  LPS:
    id: LPS
    name: o-{hydroxy[((2r)-2-hydroxy-3-{[(1s)-1-hydroxypentadecyl]oxy}propyl)oxy]phosphoryl}-l-serine
    synonyms:
    - S
    - (2S)-2-amino-3-[hydroxy-[(2R)-2-hydroxy-3-(1-hydroxypentadecoxy)propoxy]phosphoryl]oxy-propanoic
      acid
    - O-[(R)-hydroxy{[(2R)-2-hydroxy-3-{[(1R)-1-hydroxypentadecyl]oxy}propyl]oxy}phosphoryl]-L-serine
    identifiers:
    - ns: pdb-ccd
      id: LPS
    structure: CCCCCCCCCCCCCCC(OC[C@H](COP(=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-])O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  LRK:
    id: LRK
    name: (2s)-2-azanyl-6-[[(2r,4r)-1,4-bis(oxidanyl)-3-oxidanylidene-5-phosphonooxy-pentan-2-yl]amino]hexanoic
      acid
    synonyms:
    - (2S)-2-azanyl-6-[[(2R,4R)-1,4-bis(oxidanyl)-3-oxidanylidene-5-phosphonooxy-pentan-2-yl]amino]hexanoic
      acid
    - (2S)-2-amino-6-{[(2R,4R)-1,4-dihydroxy-3-oxo-5-(phosphonooxy)pentan-2-yl]amino}hexanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: LRK
    structure: OC[C@H](C(=O)[C@@H](COP(=O)([O-])[O-])O)[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 28
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    - molecule: Monomer
      element: H
      position: 28
      charge: 1
  LSO:
    id: LSO
    name: (z)-n~6~-(3-carboxy-1-{[(4-carboxy-2-oxobutyl)sulfonyl]methyl}propylidene)-l-lysine
    synonyms:
    - (E)-N~6~-(3-carboxy-1-{[(4-carboxy-2-oxobutyl)sulfonyl]methyl}propylidene)-L-lysine
    - K
    - (2S)-2-amino-6-[[5-hydroxy-1-(5-hydroxy-2,5-dioxo-pentyl)sulfonyl-5-oxo-pentan-2-ylidene]amino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: LSO
    structure: '[O-]C(=O)CC/C(=N\CCCC[C@@H](C(=O)[O-])[NH3+])/CS(=O)(=O)CC(=O)CCC(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LTA:
    id: LTA
    name: 4,8-diamino-3-hydroxy-octanoic acid ethyl ester
    synonyms:
    - ethyl (3S,4S)-4,8-diamino-3-hydroxyoctanoate
    - X
    - ethyl (3S,4S)-4,8-diamino-3-hydroxy-octanoate
    identifiers:
    - ns: pdb-ccd
      id: LTA
    structure: CCOC(=O)C[C@@H]([C@H](CCCC[NH3+])[NH3+])O
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  LVG:
    id: LVG
    name: l-vinylglycine
    synonyms:
    - (2S)-2-aminobut-3-enoic acid
    - G
    identifiers:
    - ns: pdb-ccd
      id: LVG
    structure: '[O-]C(=O)[C@@H]([NH3+])C=C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  LVN:
    id: LVN
    name: (3s)-4-oxo-l-valine
    synonyms:
    - V
    - (2S,3S)-2-azanyl-3-methyl-4-oxo-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LVN
    structure: O=C[C@H]([C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  LWY:
    id: LWY
    name: 1-[(r)-hydroxy(methyl)phosphoryl]-l-proline
    synonyms:
    - (2S)-1-[hydroxy(methyl)phosphoryl]pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: LWY
    structure: '[O-]C(=O)[C@@H]1CCCN1P(=O)(C)[O-]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  LYF:
    id: LYF
    name: (2e,4s)-2-{[(5s)-5-amino-5-carboxypentyl]imino}-4-hydroxyheptanedioic acid
    synonyms:
    - (2E,4S)-2-{[(5S)-5-amino-5-carboxypentyl]imino}-4-hydroxyheptanedioic acid
    - K
    - (2E,4S)-2-[(5S)-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]imino-4-oxidanyl-heptanedioic
      acid
    identifiers:
    - ns: pdb-ccd
      id: LYF
    structure: O[C@H](C/C(=[NH+]\CCCC[C@@H](C(=O)[O-])[NH3+])/C(=O)[O-])CCC(=O)[O-]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  LYH:
    id: LYH
    name: 3,4 ene-lysine
    synonyms:
    - (E,2S)-2,6-bis(azanyl)hex-3-enoic acid
    - (2S,3E)-2,6-diaminohex-3-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: LYH
    structure: '[NH3+]CC/C=C/[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  LYO:
    id: LYO
    name: 4-hydroxy-lysine
    synonyms:
    - (2S)-2,6-bis(azanyl)-4-hydroxy-hexanoic acid
    - K
    - (4S)-4-hydroxy-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: LYO
    structure: '[O-]C(=O)[C@@H]([NH3+])CC(CC[NH3+])O'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  LYU:
    id: LYU
    name: n~6~-(4-methylpentyl)-l-lysine
    synonyms:
    - N~6~-(4-methylpentyl)-L-lysine
    - (2S)-2-azanyl-6-(4-methylpentylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: LYU
    structure: CC(CCC[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  LYV:
    id: LYV
    name: o-phosphono-l-seryl-n-[(3s)-3-amino-3-carboxypropyl]glycinamide
    synonyms:
    - (2S)-2-azanyl-4-[2-[[(2S)-2-azanyl-3-phosphonooxy-propanoyl]amino]ethanoylamino]butanoic
      acid
    - O-phosphono-L-seryl-N-[(3S)-3-amino-3-carboxypropyl]glycinamide
    identifiers:
    - ns: pdb-ccd
      id: LYV
    structure: O=C(CNC(=O)[C@H](COP(=O)([O-])[O-])[NH3+])NCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 27
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    - molecule: Monomer
      element: H
      position: 27
      charge: 1
  LYX:
    id: LYX
    name: n''-(2-coenzyme a)-propanoyl-lysine
    synonyms:
    - (2S)-2-amino-6-[[(2S)-2-[2-[3-[[(2R)-4-[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-3-phosphonooxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxy-2-hydroxy-3,3-dimethyl-butanoyl]amino]propanoylamino]ethylsulfanyl]propanoyl]amino]hexanoic
      acid
    - (3S,5R,9R,19S,26S)-26-amino-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9-trihydroxy-8,8,19-trimethyl-10,14,20-trioxo-2,4,6-trioxa-18-thia-11,15,21-triaza-3,5-diphosphaheptacosan-27-oic
      acid 3,5-dioxide (non-preferred name)
    - K
    identifiers:
    - ns: pdb-ccd
      id: LYX
    structure: O=C(NCCS[C@H](C(=O)NCCCC[C@@H](C(=O)[O-])[NH3+])C)CCNC(=O)[C@@H](C(COP(=O)(OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1OP(=O)([O-])[O-])O)n1cnc2c1ncnc2N)[O-])[O-])(C)C)O
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  M0H:
    id: M0H
    name: s-(hydroxymethyl)-l-cysteine
    synonyms:
    - S-(hydroxymethyl)-L-cysteine
    - C
    - (2R)-2-amino-3-(hydroxymethylsulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: M0H
    structure: '[O-]C(=O)[C@@H]([NH3+])CSCO'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  M2L:
    id: M2L
    name: (2r)-2-amino-3-(2-dimethylaminoethylsulfanyl)propanoic acid
    synonyms:
    - S-[2-(dimethylamino)ethyl]-L-cysteine
    - K
    - (2R)-2-amino-3-(2-dimethylaminoethylsulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: M2L
    structure: C[NH+](CCSC[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  M2S:
    id: M2S
    name: 3-{[(r)-methylsulfinyl]methyl}-l-valine
    synonyms:
    - M
    - 3-{[(R)-methylsulfinyl]methyl}-L-valine
    - (2S)-2-amino-3,3-dimethyl-4-[(R)-methylsulfinyl]butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: M2S
    structure: C[S@@](=O)CC([C@@H](C(=O)[O-])[NH3+])(C)C
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  M3R:
    id: M3R
    name: methyl phosphonated l-arginine
    synonyms:
    - (2S)-5-carbamimidamido-2-[(hydroxy-methyl-phosphoryl)amino]pentanoic acid
    - N~2~-[(R)-hydroxy(methyl)phosphoryl]-L-arginine
    identifiers:
    - ns: pdb-ccd
      id: M3R
    structure: '[O-]C(=O)[C@@H](NP(=O)(C)[O-])CCCNC(=[NH2+])N'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  MA:
    id: MA
    name: methyl l-alaninate
    synonyms:
    - A
    - methyl (2S)-2-aminopropanoate
    - methyl L-alaninate
    identifiers:
    - ns: pdb-ccd
      id: MA
    structure: COC(=O)[C@@H]([NH3+])C
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  MBQ:
    id: MBQ
    name: 2-hydroxy-5-({1-[(4-methylphenoxy)methyl]-3-oxoprop-1-enyl}amino)-l-tyrosine
    synonyms:
    - (2S)-2-amino-3-[2,4-dihydroxy-5-[[(E)-1-(4-methylphenoxy)-4-oxo-but-2-en-2-yl]amino]phenyl]propanoic
      acid
    - Y
    - 2-hydroxy-5-({(1E)-1-[(4-methylphenoxy)methyl]-3-oxoprop-1-en-1-yl}amino)-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: MBQ
    structure: O=C/C=C(/Nc1cc(C[C@@H](C(=O)[O-])[NH3+])c(cc1O)O)\COc1ccc(cc1)C
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  MCG:
    id: MCG
    name: (s)-(alpha)-methyl-4-carboxyphenylglycine
    synonyms:
    - 4-[(1S)-1-amino-1-carboxyethyl]benzoic acid
    - X
    - 4-[(2S)-2-amino-1-hydroxy-1-oxo-propan-2-yl]benzoic acid
    identifiers:
    - ns: pdb-ccd
      id: MCG
    structure: '[O-]C(=O)c1ccc(cc1)[C@@](C(=O)[O-])([NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  MCS:
    id: MCS
    name: malonyl cysteine
    synonyms:
    - S-(carboxyacetyl)-L-cysteine
    - C
    - (2R)-2-amino-3-(3-hydroxy-3-oxo-propanoyl)sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MCS
    structure: '[O-]C(=O)CC(=O)SC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  MD3:
    id: MD3
    name: n-(carboxycarbonyl)-s-(naphthalen-2-ylmethyl)-l-cysteine
    synonyms:
    - N-(carboxycarbonyl)-S-(naphthalen-2-ylmethyl)-L-cysteine
    - (2R)-2-(carboxycarbonylamino)-3-(naphthalen-2-ylmethylsulfanyl)propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: MD3
    structure: '[O-]C(=O)[C@@H](NC(=O)C(=O)[O-])CSCc1ccc2c(c1)cccc2'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  MD5:
    id: MD5
    name: n-(carboxycarbonyl)-s-(3-nitrobenzyl)-l-cysteine
    synonyms:
    - N-(carboxycarbonyl)-S-(3-nitrobenzyl)-L-cysteine
    - (2R)-2-(carboxycarbonylamino)-3-[(3-nitrophenyl)methylsulfanyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MD5
    structure: '[O-]C(=O)[C@@H](NC(=O)C(=O)[O-])CSCc1cccc(c1)[N+](=O)[O-]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  MDF:
    id: MDF
    name: meta, meta'-di-hydroxy-phenylalanine
    synonyms:
    - methyl (2S)-2-amino-2-(3,5-dihydroxyphenyl)ethanoate
    - methyl (2S)-amino(3,5-dihydroxyphenyl)ethanoate
    - Y
    identifiers:
    - ns: pdb-ccd
      id: MDF
    structure: COC(=O)[C@H](c1cc(O)cc(c1)O)N
    base_monomers:
    - Y
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  MDO:
    id: MDO
    name: '{2-[(1s)-1-aminoethyl]-4-methylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[2-[(1S)-1-azanylethyl]-4-methylidene-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - ASG
    - '{2-[(1S)-1-aminoethyl]-4-methylidene-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: MDO
    structure: '[O-]C(=O)CN1C(=O)C(=C)N=C1[C@@H]([NH3+])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  ME0:
    id: ME0
    name: hydroxy-l-methionine
    synonyms:
    - hydroxy-L-methionine
    - (2S)-2-azanyl-4-(hydroxymethylsulfanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ME0
    structure: OCSCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MEG:
    id: MEG
    name: (2s,3s)-2-azanyl-3-methyl-pentanedioic acid
    synonyms:
    - E
    - (2S,3S)-2-azanyl-3-methyl-pentanedioic acid
    - (3S)-3-methyl-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: MEG
    structure: '[O-]C(=O)C[C@@H]([C@@H](C(=O)[O-])[NH3+])C'
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  MF3:
    id: MF3
    name: 2-amino-4-trifluoromethylsulfanyl-butyric acid
    synonyms:
    - trifluoro-L-methionine
    - X
    - (2S)-2-amino-4-(trifluoromethylsulfanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MF3
    structure: '[O-]C(=O)[C@H](CCSC(F)(F)F)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  MFC:
    id: MFC
    name: 5-[1-(3-fluoro-4-hydroxy-phenyl)-meth-(z)-ylidene]-3,5-dihydro-imidazol-4-one
    synonyms:
    - '{(4Z)-2-[(1R,2R)-1-amino-2-hydroxypropyl]-4-[(3-fluoro-4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - GYG
    - 2-[(4Z)-2-[(1R,2R)-1-amino-2-hydroxy-propyl]-4-[(3-fluoro-4-hydroxy-phenyl)methylidene]-5-oxo-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: MFC
    structure: '[O-]C(=O)CN1C(=O)/C(=C/c2ccc(c(c2)F)O)/N=C1[C@H]([C@H](O)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  MGG:
    id: MGG
    name: 2-(2-carboxy-acetylamino)-5-guanidino-pentanoic acid
    synonyms:
    - '[amino-[[(4R)-5-hydroxy-4-[(3-hydroxy-3-oxo-propanoyl)amino]-5-oxo-pentyl]amino]methylidene]azanium'
    - R
    - amino({(4R)-4-carboxy-4-[(carboxyacetyl)amino]butyl}amino)methaniminium
    identifiers:
    - ns: pdb-ccd
      id: MGG
    structure: O=C(N[C@@H](C(=O)[O-])CCCNC(=[NH2+])N)CC(=O)[O-]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  MH8:
    id: MH8
    name: (2s)-2-amino-2-methylhept-6-enoic acid
    synonyms:
    - (2S)-2-azanyl-2-methyl-hept-6-enoic acid
    - (2S)-2-amino-2-methylhept-6-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: MH8
    structure: C=CCCC[C@@](C(=O)[O-])([NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  MHE:
    id: MHE
    name: 5,5-dimethyl-2-oxohexanoic acid
    synonyms:
    - 5,5-dimethyl-2-oxo-hexanoic acid
    - 5,5-dimethyl-2-oxohexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MHE
    structure: O=C(C(=O)[O-])CCC(C)(C)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 5
      charge: -1
  MHL:
    id: MHL
    name: n-methyl-4-hydroxy-leucine
    synonyms:
    - (2S)-4-hydroxy-4-methyl-2-methylamino-pentanoic acid
    - L
    - 4-hydroxy-N-methyl-L-leucine
    identifiers:
    - ns: pdb-ccd
      id: MHL
    structure: C[NH2+][C@H](C(=O)[O-])CC(O)(C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  MHO:
    id: MHO
    name: s-oxymethionine
    synonyms:
    - (2S)-2-amino-4-[(S)-methylsulfinyl]butanoic acid
    - M
    identifiers:
    - ns: pdb-ccd
      id: MHO
    structure: C[S@](=O)CC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MHU:
    id: MHU
    name: 4-n,n-(dimethylamino)-l-phenylalanine
    synonyms:
    - 4-(dimethylamino)-N-methyl-L-phenylalanine
    - (2S)-3-(4-dimethylaminophenyl)-2-methylamino-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MHU
    structure: C[NH2+][C@H](C(=O)[O-])Cc1ccc(cc1)N(C)C
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  MHV:
    id: MHV
    name: 4-oxo-l-pipecolic acid
    synonyms:
    - (2S)-4-oxopiperidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: MHV
    structure: O=C1CC[NH2+][C@@H](C1)C(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  MIR:
    id: MIR
    name: monoethylphosphorylserine
    synonyms:
    - (2S)-2-amino-3-(ethoxy-hydroxy-phosphoryl)oxy-propanoic acid
    - O-[(S)-ethoxy(hydroxy)phosphoryl]-L-serine
    identifiers:
    - ns: pdb-ccd
      id: MIR
    structure: '[O-]P(=O)(OCC)OC[C@H]([NH3+])C(=O)[O-]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MIS:
    id: MIS
    name: monoisopropylphosphorylserine
    synonyms:
    - O-[(R)-hydroxy(1-methylethoxy)phosphoryl]-L-serine
    - S
    - (2S)-2-amino-3-(hydroxy-propan-2-yloxy-phosphoryl)oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MIS
    structure: '[NH3+][C@H](C(=O)[O-])COP(=O)(OC(C)C)[O-]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  MK8:
    id: MK8
    name: 2-methyl-l-norleucine
    synonyms:
    - 2-methyl-L-norleucine
    - (2S)-2-azanyl-2-methyl-hexanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: MK8
    structure: '[O-]C(=O)[C@@]([NH3+])(CCCC)C'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  MKD:
    id: MKD
    name: (2s)-2-amino-2-methyloctanoic acid
    synonyms:
    - (2S)-2-azanyl-2-methyl-octanoic acid
    - (2S)-2-amino-2-methyloctanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MKD
    structure: CCCCCC[C@@](C(=O)[O-])([NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  ML3:
    id: ML3
    name: 2-{[(2r)-2-amino-2-carboxyethyl]sulfanyl}-n,n,n-trimethylethanaminium
    synonyms:
    - 2-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}-N,N,N-trimethylethanaminium
    - 2-[(2R)-2-amino-3-hydroxy-3-oxo-propyl]sulfanylethyl-trimethyl-azanium
    - K
    identifiers:
    - ns: pdb-ccd
      id: ML3
    structure: '[O-]C(=O)[C@H](CSCC[N+](C)(C)C)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  MMO:
    id: MMO
    name: n~2~-methyl-l-arginine
    synonyms:
    - N~2~-methyl-L-arginine
    - (2S)-5-carbamimidamido-2-(methylamino)pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: MMO
    structure: C[NH2+][C@H](C(=O)[O-])CCCNC(=[NH2+])N
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  MNL:
    id: MNL
    name: 4,n-dimethylnorleucine
    synonyms:
    - (2S,4R)-4-methyl-2-methylamino-hexanoic acid
    - (4R)-N,4-dimethyl-L-norleucine
    - L
    identifiers:
    - ns: pdb-ccd
      id: MNL
    structure: CC[C@H](C[C@@H](C(=O)[O-])[NH2+]C)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MOD:
    id: MOD
    name: l-methionyl adenylate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(6-amino-1,4-dihydropurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      [(2S)-2-amino-4-methylsulfanyl-butyl] hydrogen phosphate'
    - X
    - 5'-O-[(S)-{[(2S)-2-amino-4-(methylsulfanyl)butyl]oxy}(hydroxy)phosphoryl]adenosine
    identifiers:
    - ns: pdb-ccd
      id: MOD
    structure: CSCC[C@@H](CO[P@@](=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)N1C=NC2=C(NC=NC12)N)[O-])[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
  MP4:
    id: MP4
    name: (2s)-amino(3,5-dihydroxy-4-methylphenyl)ethanoic acid
    synonyms:
    - (2S)-amino(3,5-dihydroxy-4-methylphenyl)ethanoic acid
    - (2S)-2-azanyl-2-[4-methyl-3,5-bis(oxidanyl)phenyl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MP4
    structure: '[NH3+][C@@H](c1cc(O)c(c(c1)O)C)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  MP8:
    id: MP8
    name: (4r)-4-methyl-l-proline
    synonyms:
    - P
    - (2S,4R)-4-methylpyrrolidine-2-carboxylic acid
    - (4R)-4-methyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: MP8
    structure: '[O-]C(=O)[C@@H]1C[C@H](C[NH2+]1)C'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  MPH:
    id: MPH
    name: (1-amino-3-methylsulfanyl-propyl)-phosphonic acid
    synonyms:
    - '[(1R)-1-amino-3-(methylsulfanyl)propyl]phosphonic acid'
    - '[(1R)-1-amino-3-methylsulfanyl-propyl]phosphonic acid'
    - X
    identifiers:
    - ns: pdb-ccd
      id: MPH
    structure: CSCC[C@@H](P(=O)([O-])[O-])[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MPJ:
    id: MPJ
    name: (1-amino-3-methylsulfanyl-propyl)-phosphinic acid
    synonyms:
    - (R)-[(1R)-1-amino-3-(methylsulfanyl)propyl]phosphinic acid
    - '[(1R)-1-amino-3-methylsulfanyl-propyl]phosphinic acid'
    - X
    identifiers:
    - ns: pdb-ccd
      id: MPJ
    structure: '[O-]P(=O)[C@@H]([NH3+])CCSC'
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  MPQ:
    id: MPQ
    name: n-methyl-alpha-phenyl-glycine
    synonyms:
    - G
    - (2S)-2-(methylamino)-2-phenyl-ethanoic acid
    - (2S)-(methylamino)(phenyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MPQ
    structure: '[O-]C(=O)[C@H](c1ccccc1)[NH2+]C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  MSA:
    id: MSA
    name: (2-s-methyl) sarcosine
    synonyms:
    - G
    - (2R)-(methylamino)(methylsulfanyl)ethanoic acid
    - (2R)-2-methylamino-2-methylsulfanyl-ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MSA
    structure: CS[C@H](C(=O)[O-])[NH2+]C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  MSE:
    id: MSE
    name: selenomethionine
    synonyms:
    - (2S)-2-amino-4-methylselanyl-butanoic acid
    - M
    - (2S)-2-amino-4-(methylselanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MSE
    structure: '[O-]C(=O)[C@@H]([NH3+])CC[Se]C'
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  MSL:
    id: MSL
    name: (2s)-2-amino-4-(methylsulfonimidoyl)butanoic acid
    synonyms:
    - (2S)-2-amino-4-(S-methylsulfonimidoyl)butanoic acid
    - M
    - (2S)-2-amino-4-(methylsulfonimidoyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MSL
    structure: '[O-]C(=O)[C@H](CC[S@](=O)(=N)C)[NH3+]'
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  MSO:
    id: MSO
    name: selenomethionine selenoxide
    synonyms:
    - (2S)-2-amino-4-[(R)-methylseleninyl]butanoic acid
    - (2S)-2-amino-4-(methylseleninyl)butanoic acid
    - M
    identifiers:
    - ns: pdb-ccd
      id: MSO
    structure: C[Se](=O)CC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MSP:
    id: MSP
    name: 5'-o-[(l-methionyl)-sulphamoyl]adenosine
    synonyms:
    - 5'-O-(L-methionylsulfamoyl)adenosine
    - '[(2R,3S,4R,5R)-5-(6-amino-1,4-dihydropurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      N-[(2S)-2-amino-4-methylsulfanyl-butanoyl]sulfamate'
    - X
    identifiers:
    - ns: pdb-ccd
      id: MSP
    structure: CSCC[C@@H](C(=O)[N-]S(=O)(=O)OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)N1C=NC2=C(NC=NC12)N)N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 28
  MT2:
    id: MT2
    name: '[(3s)-3-amino-3-carboxypropyl](ethyl)methylsulfonium'
    synonyms:
    - M
    - '[(3S)-3-amino-3-carboxypropyl](ethyl)methylsulfonium'
    - '[(3S)-3-amino-4-hydroxy-4-oxo-butyl]-ethyl-methyl-sulfanium'
    identifiers:
    - ns: pdb-ccd
      id: MT2
    structure: CC[S@+](CC[C@@H](C(=O)[O-])[NH3+])C
    base_monomers:
    - M
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  MTY:
    id: MTY
    name: meta-tyrosine
    synonyms:
    - 3-hydroxy-L-phenylalanine
    - Y
    - (2S)-2-amino-3-(3-hydroxyphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MTY
    structure: '[O-]C(=O)[C@H](Cc1cccc(c1)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  MVA:
    id: MVA
    name: n-methylvaline
    synonyms:
    - V
    - N-methyl-L-valine
    - (2S)-3-methyl-2-(methylamino)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MVA
    structure: C[NH2+][C@H](C(=O)[O-])C(C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  MYN:
    id: MYN
    name: (2s)-amino[(4r)-2-amino-1,4,5,6-tetrahydropyrimidin-4-yl]ethanoic acid
    synonyms:
    - (2S)-2-azanyl-2-[(4R)-2-azanyl-1,4,5,6-tetrahydropyrimidin-4-yl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: MYN
    structure: '[O-]C(=O)[C@H]([C@H]1CCNC(=[NH+]1)N)N'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  N10:
    id: N10
    name: o-[(hexylamino)carbonyl]-l-serine
    synonyms:
    - S
    - (2S)-2-amino-3-(hexylcarbamoyloxy)propanoic acid
    - O-(hexylcarbamoyl)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: N10
    structure: CCCCCCNC(=O)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  N2C:
    id: N2C
    name: n,s-dimethylcysteine
    synonyms:
    - N,S-dimethyl-L-cysteine
    - (2R)-2-methylamino-3-methylsulfanyl-propanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: N2C
    structure: CSC[C@@H](C(=O)[O-])[NH2+]C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  N7P:
    id: N7P
    name: 1-acetyl-l-proline
    synonyms:
    - P
    - (2~{S})-1-ethanoylpyrrolidine-2-carboxylic acid
    - 1-acetyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: N7P
    structure: CC(=O)N1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
  N80:
    id: N80
    name: 1-ethenyl-l-proline
    synonyms:
    - 1-ethenyl-L-proline
    - P
    - (2S)-1-ethenylpyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: N80
    structure: C=C[NH+]1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
  NA8:
    id: NA8
    name: (1s)-1-carboxy-2-naphthalen-2-ylethanaminium
    synonyms:
    - A
    - (1S)-1-carboxy-2-naphthalen-2-ylethanaminium
    - '[(2S)-1-hydroxy-3-naphthalen-2-yl-1-oxo-propan-2-yl]azanium'
    identifiers:
    - ns: pdb-ccd
      id: NA8
    structure: '[O-]C(=O)[C@H](Cc1ccc2c(c1)cccc2)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  NAL:
    id: NAL
    name: beta-(2-naphthyl)-alanine
    synonyms:
    - A
    - (2S)-2-azanyl-3-naphthalen-2-yl-propanoic acid
    - (2S)-2-amino-3-(naphthalen-2-yl)propanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: NAL
    structure: '[O-]C(=O)[C@H](Cc1ccc2c(c1)cccc2)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  NB8:
    id: NB8
    name: 5'-o-[(r)-{[(2s)-2-amino-4-(hydroxyamino)-4-oxobutanoyl]oxy}(hydroxy)phosphoryl]adenosine
    synonyms:
    - N
    - 5'-O-[(R)-{[(2S)-2-amino-4-(hydroxyamino)-4-oxobutanoyl]oxy}(hydroxy)phosphoryl]adenosine
    - '[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      (2S)-2-amino-4-(hydroxyamino)-4-oxo-butanoate'
    identifiers:
    - ns: pdb-ccd
      id: NB8
    structure: ONC(=O)C[C@@H](C(=O)OP(=O)(OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-])N
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
  NBQ:
    id: NBQ
    name: 2-hydroxy-5-({1-[(2-naphthyloxy)methyl]-3-oxoprop-1-enyl}amino)tyrosine
    synonyms:
    - 2-hydroxy-5-({(1E)-1-[(naphthalen-2-yloxy)methyl]-3-oxoprop-1-en-1-yl}amino)-L-tyrosine
    - Y
    - (2S)-2-amino-3-[2,4-dihydroxy-5-[[(E)-1-naphthalen-2-yloxy-4-oxo-but-2-en-2-yl]amino]phenyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: NBQ
    structure: O=C/C=C(/Nc1cc(C[C@@H](C(=O)[O-])[NH3+])c(cc1O)O)\COc1ccc2c(c1)cccc2
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  NC1:
    id: NC1
    name: nitrocefin acyl-serine
    synonyms:
    - (2R)-2-[(1R)-2-[(2S)-2-amino-3-oxido-3-oxo-propoxy]-2-oxo-1-(2-thiophen-2-ylethanoylamino)ethyl]-5-[(E)-2-(2,4-dinitrophenyl)ethenyl]-3,6-dihydro-2H-1,3-thiazine-4-carboxylate
    - S
    - (2R)-2-{(1R)-2-[(2S)-2-amino-2-carboxylatoethoxy]-2-oxo-1-[(thiophen-2-ylacetyl)amino]ethyl}-5-[(E)-2-(2,4-dinitrophenyl)ethenyl]-3,6-dihydro-2H-1,3-thiazine-4-carboxylate
    identifiers:
    - ns: pdb-ccd
      id: NC1
    structure: O=C(N[C@@H]([C@H]1SCC(=C([NH2+]1)C(=O)[O-])/C=C/c1ccc(cc1[N+](=O)[O-])[N+](=O)[O-])C(=O)OC[C@@H](C(=O)[O-])[NH3+])Cc1cccs1
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  NCB:
    id: NCB
    name: n-carbamoyl-alanine
    synonyms:
    - A
    - N-carbamoyl-D-alanine
    - (2R)-2-(aminocarbonylamino)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NCB
    structure: NC(=O)N[C@@H](C(=O)[O-])C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  NCY:
    id: NCY
    name: n-methylcysteine
    synonyms:
    - (2R)-2-methylamino-3-sulfanyl-propanoic acid
    - X
    - N-methyl-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: NCY
    structure: '[O-]C(=O)[C@@H]([NH2+]C)CS'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  NKS:
    id: NKS
    name: n-(3-{[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)-n-[(4-methylphenoxy)carbonyl]glycine
    synonyms:
    - N-(3-{[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)-N-[(4-methylphenoxy)carbonyl]glycine
    - 2-[[3-[[2-(4-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methoxy]phenyl]methyl-(4-methylphenoxy)carbonyl-amino]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: NKS
    structure: '[O-]C(=O)CN(C(=O)Oc1ccc(cc1)C)Cc1cccc(c1)OCc1nc(oc1C)c1ccc(cc1)Cl'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  NLB:
    id: NLB
    name: 6-(benzyloxy)-l-norleucine
    synonyms:
    - (2S)-2-azanyl-6-phenylmethoxy-hexanoic acid
    - 6-(benzyloxy)-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: NLB
    structure: '[O-]C(=O)[C@H](CCCCOCc1ccccc1)[NH3+]'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  NLE:
    id: NLE
    name: norleucine
    synonyms:
    - L-norleucine
    - (2S)-2-aminohexanoic acid
    - L
    identifiers:
    - ns: pdb-ccd
      id: NLE
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCC'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  NLN:
    id: NLN
    name: norleucine amide
    synonyms:
    - L-norleucinamide
    - (2S)-2-aminohexanamide
    - L
    identifiers:
    - ns: pdb-ccd
      id: NLN
    structure: CCCC[C@H]([NH3+])C(=O)N
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    - molecule: Monomer
      element: H
      position: 7
      charge: 1
  NLO:
    id: NLO
    name: o-methyl-l-norleucine
    synonyms:
    - methyl (2S)-2-aminohexanoate
    - L
    - methyl L-norleucinate
    identifiers:
    - ns: pdb-ccd
      id: NLO
    structure: CCCC[C@@H](C(=O)OC)[NH3+]
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  NLP:
    id: NLP
    name: (1-amino-pentyl)-phosphonic acid
    synonyms:
    - '[(1R)-1-aminopentyl]phosphonic acid'
    - L
    identifiers:
    - ns: pdb-ccd
      id: NLP
    structure: CCCC[C@@H](P(=O)([O-])[O-])[NH3+]
    base_monomers:
    - L
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  NLQ:
    id: NLQ
    name: n~2~-acetyl-l-glutamine
    synonyms:
    - N~2~-acetyl-L-glutamine
    - Q
    - (2S)-2-acetamido-5-amino-5-oxo-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NLQ
    structure: NC(=O)CC[C@@H](C(=O)[O-])NC(=O)C
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  NMC:
    id: NMC
    name: n-cyclopropylmethyl glycine
    synonyms:
    - G
    - 2-(cyclopropylmethylamino)ethanoic acid
    - N-(cyclopropylmethyl)glycine
    identifiers:
    - ns: pdb-ccd
      id: NMC
    structure: '[O-]C(=O)C[NH2+]CC1CC1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    - molecule: Monomer
      element: H
      position: 5
      charge: 1
  NMM:
    id: NMM
    name: (2s)-2-amino-5-[(n-methylcarbamimidoyl)amino]pentanoic acid
    synonyms:
    - N~5~-(N-methylcarbamimidoyl)-L-ornithine
    - R
    - (2S)-2-amino-5-[(N-methylcarbamimidoyl)amino]pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NMM
    structure: CNC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  NNH:
    id: NNH
    name: nor-n-omega-hydroxy-l-arginine
    synonyms:
    - (2S)-2-amino-4-[(N-hydroxycarbamimidoyl)amino]butanoic acid
    - R
    - (2S)-2-amino-4-(N'-hydroxycarbamimidamido)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NNH
    structure: '[O-]C(=O)[C@@H]([NH3+])CCNC(=[NH2+])NO'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  NOT:
    id: NOT
    name: 6-azido-l-norleucine
    synonyms:
    - (2S)-2-amino-6-azido-hexanoic acid
    - 6-azido-L-norleucine
    identifiers:
    - ns: pdb-ccd
      id: NOT
    structure: '[N-]=[N+]=NCCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  NPH:
    id: NPH
    name: cysteine-methylene-carbamoyl-1,10-phenanthroline
    synonyms:
    - (2R)-2-amino-3-[2-oxo-2-(1,10-phenanthrolin-5-ylamino)ethyl]sulfanyl-propanoic
      acid
    - S-[2-oxo-2-(1,10-phenanthrolin-5-ylamino)ethyl]-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: NPH
    structure: O=C(Nc1cc2cccnc2c2c1cccn2)CSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  NPI:
    id: NPI
    name: (2s)-2-aminoheptanedioic acid
    synonyms:
    - A
    - (2S)-2-aminoheptanedioic acid
    - (2S)-2-azanylheptanedioic acid
    identifiers:
    - ns: pdb-ccd
      id: NPI
    structure: '[O-]C(=O)CCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  NRG:
    id: NRG
    name: n-omega-nitro-l-arginine
    synonyms:
    - N~5~-(N-nitrocarbamimidoyl)-L-ornithine
    - (2S)-2-amino-5-[(N-nitrocarbamimidoyl)amino]pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NRG
    structure: '[O-][N+](=O)NC(=[NH2+])NCCC[C@@H](C(=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  NRP:
    id: NRP
    name: '{4-[(4-hydroxyphenyl)methylidene]-2-[(1e)-3-methylbutanimidoyl]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[4-[(4-hydroxyphenyl)methylidene]-2-(3-methylbutanimidoyl)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - '{(4E)-4-(4-hydroxybenzylidene)-2-[(1E)-3-methylbutanimidoyl]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - LYG
    identifiers:
    - ns: pdb-ccd
      id: NRP
    structure: CC(CC(=N)C1=NC(=Cc2ccc(cc2)O)C(=O)N1CC(=O)[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  NSK:
    id: NSK
    name: n-succinyl lysine
    synonyms:
    - X
    - (2S)-6-amino-2-[(4-hydroxy-4-oxo-butanoyl)amino]hexanoic acid
    - N~2~-(3-carboxypropanoyl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: NSK
    structure: '[NH3+]CCCC[C@@H](C(=O)[O-])NC(=O)CCC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  NTR:
    id: NTR
    name: meta-hydroxy beta nor-tyrosine
    synonyms:
    - (2R)-2-amino-2-(3,4-dihydroxyphenyl)ethanoic acid
    - Y
    - (2R)-amino(3,4-dihydroxyphenyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: NTR
    structure: '[O-]C(=O)[C@@H](c1ccc(c(c1)O)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  NVA:
    id: NVA
    name: norvaline
    synonyms:
    - V
    - (2S)-2-aminopentanoic acid
    - L-norvaline
    identifiers:
    - ns: pdb-ccd
      id: NVA
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC'
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  NWD:
    id: NWD
    name: 3-(5-nitro-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[5-nitro-2,4-bis(oxidanylidene)pyrimidin-1-yl]propanoic acid
    - 3-(5-nitro-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: NWD
    structure: '[O-]C(=O)[C@H](CN1CC([N+](=O)[O-])C(=O)[N-]C1=O)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  NYB:
    id: NYB
    name: n-methyl-s-[(1r)-1-methylpropyl]-l-cysteine
    synonyms:
    - (2R)-3-[(2R)-butan-2-yl]sulfanyl-2-methylamino-propanoic acid
    - N-methyl-S-[(1R)-1-methylpropyl]-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: NYB
    structure: CC[C@H](SC[C@@H](C(=O)[O-])[NH2+]C)C
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  NYS:
    id: NYS
    name: s-{5-[(1r)-2-amino-1-hydroxyethyl]-2,3-dihydroxyphenyl}-l-cysteine
    synonyms:
    - (2R)-2-amino-3-[5-[(1R)-2-amino-1-hydroxy-ethyl]-2,3-dihydroxy-phenyl]sulfanyl-propanoic
      acid
    - S-{5-[(1R)-2-amino-1-hydroxyethyl]-2,3-dihydroxyphenyl}-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: NYS
    structure: '[NH3+]C[C@@H](c1cc(SC[C@@H](C(=O)[O-])[NH3+])c(c(c1)O)O)O'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  NZC:
    id: NZC
    name: n-methylidene-l-threonine
    synonyms:
    - (2S,3R)-2-(methylamino)-3-oxidanyl-butanoic acid
    - T
    - N-methyl-L-threonine
    identifiers:
    - ns: pdb-ccd
      id: NZC
    structure: C[NH2+][C@H](C(=O)[O-])[C@H](O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  NZH:
    id: NZH
    name: (2s)-2-amino-3-[1-(1h-tetraazol-5-yl)-1h-imidazol-4-yl]propanal
    synonyms:
    - (2S)-2-amino-3-[1-(1H-1,2,3,4-tetrazol-5-yl)imidazol-4-yl]propanal
    - H
    - (2S)-2-amino-3-[1-(1H-tetrazol-5-yl)-1H-imidazol-4-yl]propanal
    identifiers:
    - ns: pdb-ccd
      id: NZH
    structure: '[O-]C(=O)[C@H](Cc1ncn(c1)c1[n-]nnn1)[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  O12:
    id: O12
    name: n~5~-dodecanoyl-l-ornithine
    synonyms:
    - (2S)-2-amino-5-(dodecanoylamino)pentanoic acid
    - X
    - N~5~-dodecanoyl-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: O12
    structure: CCCCCCCCCCCC(=O)NCCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  OBF:
    id: OBF
    name: (2s)-2-amino-4,4-difluorobutanoic acid
    synonyms:
    - (2S)-2-amino-4,4-difluorobutanoic acid
    - (2S)-2-amino-4,4-difluoro-butanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: OBF
    structure: '[NH3+][C@H](C(=O)[O-])CC(F)F'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  OBS:
    id: OBS
    name: (z)-n^6-[(4s,5r)-5-(2-carboxyethyl)-4-(carboxymethyl)-1-hydroxydihydro-2h-thiopyranium-3(4h)-ylidene]-l-lysine
    synonyms:
    - (E)-N~6~-[(1S,4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)-1-oxidodihydro-2H-thiopyran-3(4H)-ylidene]-L-lysine
    - K
    - (2S)-2-amino-6-[[(1S,4R,5S)-5-(2-carboxyethyl)-4-(carboxymethyl)-1-oxo-thian-3-ylidene]amino]hexanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: OBS
    structure: '[O-]C(=O)C[C@@H]1[C@H](CCC(=O)[O-])C[S@](=O)C/C/1=N/CCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 26
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    - molecule: Monomer
      element: H
      position: 29
      charge: 1
  OCY:
    id: OCY
    name: hydroxyethylcysteine
    synonyms:
    - (2R)-2-amino-3-(2-hydroxyethylsulfanyl)propanoic acid
    - C
    - S-(2-hydroxyethyl)-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: OCY
    structure: '[O-]C(=O)[C@@H]([NH3+])CSCCO'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  OFM:
    id: OFM
    name: '[(4z)-2-{(2r,5r)-2-[(1s)-1-amino-2-phenylethyl]-2-hydroxy-5-methyl-2,5-dihydro-1,3-oxazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - '[(4Z)-2-{(2R,5R)-2-[(1S)-1-amino-2-phenylethyl]-2-hydroxy-5-methyl-2,5-dihydro-1,3-oxazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - 2-[(4Z)-2-[(2R,5R)-2-[(1S)-1-azanyl-2-phenyl-ethyl]-5-methyl-2-oxidanyl-5H-1,3-oxazol-4-yl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: OFM
    structure: '[O-]C(=O)CN1C(=N/C(=C\c2ccc(cc2)O)/C1=O)C1=N[C@@](O[C@@H]1C)(O)[C@H](Cc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  OHI:
    id: OHI
    name: 3-(2-oxo-2h-imidazol-4-yl)-l-alanine
    synonyms:
    - 3-(2-oxo-2H-imidazol-4-yl)-L-alanine
    - H
    - (2S)-2-amino-3-(2-oxoimidazol-4-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: OHI
    structure: '[O-]C(=O)[C@H](CC1=NC(=O)N=C1)[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  OIC:
    id: OIC
    name: octahydroindole-2-carboxylic acid
    synonyms:
    - (2S,3aS,7aS)-2,3,3a,4,5,6,7,7a-octahydro-1H-indole-2-carboxylic acid
    - X
    - (2S,3aS,7aS)-octahydro-1H-indole-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: OIC
    structure: '[O-]C(=O)[C@@H]1C[C@H]2[C@@H]([NH2+]1)CCCC2'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  OIM:
    id: OIM
    name: '[(4z)-2-{(2r,5r)-2-[(1s,2s)-1-amino-2-methylbutyl]-2-hydroxy-5-methyl-2,5-dihydro-1,3-oxazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - 2-[(4Z)-2-[(2R,5R)-2-[(1S,2S)-1-azanyl-2-methyl-butyl]-5-methyl-2-oxidanyl-5H-1,3-oxazol-4-yl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-{(2R,5R)-2-[(1S,2S)-1-amino-2-methylbutyl]-2-hydroxy-5-methyl-2,5-dihydro-1,3-oxazol-4-yl}-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: OIM
    structure: CC[C@@H]([C@@H]([C@]1(O)N=C([C@H](O1)C)C1=N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-])[NH3+])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 30
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  OLD:
    id: OLD
    name: 3-[2-(4-bromophenyl)-2-oxoethyl]-l-histidine
    synonyms:
    - 3-[2-(4-bromophenyl)-2-oxoethyl]-L-histidine
    - (2S)-2-amino-3-[3-[2-(4-bromophenyl)-2-oxo-ethyl]imidazol-4-yl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: OLD
    structure: '[O-]C(=O)[C@H](Cc1cncn1CC(=O)c1ccc(cc1)Br)[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 22
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    - molecule: Monomer
      element: H
      position: 22
      charge: 1
  OLZ:
    id: OLZ
    name: o-(2-aminoethyl)-l-serine
    synonyms:
    - S
    - (2S)-2-amino-3-(2-aminoethoxy)propanoic acid
    - O-(2-aminoethyl)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: OLZ
    structure: '[O-]C(=O)[C@@H]([NH3+])COCC[NH3+]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  OMH:
    id: OMH
    name: o-[(s)-hydroxy(methoxy)phosphoryl]-l-serine
    synonyms:
    - (2S)-2-amino-3-(hydroxy-methoxy-phosphoryl)oxy-propanoic acid
    - O-[(S)-hydroxy(methoxy)phosphoryl]-L-serine
    identifiers:
    - ns: pdb-ccd
      id: OMH
    structure: '[O-]P(=O)(OC)OC[C@H]([NH3+])C(=O)[O-]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  OMX:
    id: OMX
    name: (betar)-beta-hydroxy-l-tyrosine
    synonyms:
    - (2S,3R)-2-azanyl-3-(4-hydroxyphenyl)-3-oxidanyl-propanoic acid
    - Y
    - (betaR)-beta-hydroxy-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: OMX
    structure: O[C@@H]([C@@H](C(=O)[O-])[NH3+])c1ccc(cc1)O
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  OMY:
    id: OMY
    name: (betar)-3-chloro-beta-hydroxy-l-tyrosine
    synonyms:
    - (betaR)-3-chloro-beta-hydroxy-L-tyrosine
    - Y
    - (2S,3R)-2-amino-3-(3-chloro-4-hydroxy-phenyl)-3-hydroxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: OMY
    structure: '[O-]C(=O)[C@H]([C@@H](c1ccc(c(c1)Cl)O)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  ONH:
    id: ONH
    name: n~5~-hydroxy-l-ornithine
    synonyms:
    - A
    - (2S)-2-azanyl-5-(oxidanylamino)pentanoic acid
    - N~5~-hydroxy-L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: ONH
    structure: ONCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  ONL:
    id: ONL
    name: 5-oxo-l-norleucine
    synonyms:
    - 5-oxo-L-norleucine
    - X
    - (2S)-2-amino-5-oxo-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ONL
    structure: CC(=O)CC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  ORN:
    id: ORN
    name: l-ornithine
    synonyms:
    - A
    - (2S)-2,5-bis(azanyl)pentanoic acid
    - L-ornithine
    identifiers:
    - ns: pdb-ccd
      id: ORN
    structure: '[O-]C(=O)[C@@H]([NH3+])CCC[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  ORQ:
    id: ORQ
    name: n~5~-acetyl-l-ornithine
    synonyms:
    - N~5~-acetyl-L-ornithine
    - (2S)-5-acetamido-2-amino-pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: ORQ
    structure: CC(=O)NCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  OTH:
    id: OTH
    name: n,o-dimethyl-l-threonine
    synonyms:
    - N,O-dimethyl-L-threonine
    - T
    - (2S,3R)-3-methoxy-2-(methylamino)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: OTH
    structure: CO[C@@H]([C@@H](C(=O)[O-])[NH2+]C)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  OTY:
    id: OTY
    name: 2-hydroxy-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[2,4-bis(oxidanyl)phenyl]propanoic acid
    - 2-hydroxy-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: OTY
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1O)O)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  OXX:
    id: OXX
    name: oxalyl-aspartyl anhydride
    synonyms:
    - D
    - 2-[(3S)-3-amino-4-hydroxy-4-oxo-butanoyl]oxy-2-oxo-ethanoate
    - '{[(3S)-3-amino-3-carboxypropanoyl]oxy}(oxo)acetate (non-preferred name)'
    identifiers:
    - ns: pdb-ccd
      id: OXX
    structure: O=C(OC(=O)C(=O)[O-])C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  OYL:
    id: OYL
    name: 1-ethyl-l-histidine
    synonyms:
    - 1-ethyl-L-histidine
    - (2S)-2-azanyl-3-(1-ethylimidazol-4-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: OYL
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1cn(cn1)CC'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  OZT:
    id: OZT
    name: (4s,5r)-5-methyl-2-oxo-1,3-oxazolidine-4-carboxylic acid
    synonyms:
    - (4S,5R)-5-methyl-2-oxo-1,3-oxazolidine-4-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: OZT
    structure: O=C1O[C@@H]([C@H](N1)C(=O)[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  P2Q:
    id: P2Q
    name: 2-hydroxy-5-{[(1s,2e)-1-formyl-4-phenoxybut-2-en-1yl]amino}-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[2,4-dihydroxy-5-[[(E,2S)-1-oxo-5-phenoxy-pent-3-en-2-yl]amino]phenyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: P2Q
    structure: O=C[C@@H](Nc1cc(C[C@@H](C(=O)[O-])[NH3+])c(cc1O)O)/C=C/COc1ccccc1
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  P2Y:
    id: P2Y
    name: (2s)-pyrrolidin-2-ylmethylamine
    synonyms:
    - P
    - 1-[(2S)-pyrrolidin-2-yl]methanamine
    - '[(2S)-pyrrolidin-2-yl]methanamine'
    identifiers:
    - ns: pdb-ccd
      id: P2Y
    structure: '[NH3+]C[C@@H]1CCC[NH2+]1'
    base_monomers:
    - P
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  P3Q:
    id: P3Q
    name: 2-hydroxy-5-{[(1e)-1-(2-oxoethylidene)-4-phenylbutyl]amino}-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[2,4-dihydroxy-5-[[(E)-1-oxo-6-phenyl-hex-2-en-3-yl]amino]phenyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: P3Q
    structure: O=C/C=C(/Nc1cc(C[C@@H](C(=O)[O-])[NH3+])c(cc1O)O)\CCCc1ccccc1
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  P4E:
    id: P4E
    name: (2s,4e)-2-amino-5-phenylpent-4-enoic acid
    synonyms:
    - (2S)-2-azanyl-5-phenyl-pent-4-enoic acid
    - (2S,4E)-2-amino-5-phenylpent-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: P4E
    structure: '[O-]C(=O)[C@H](CC=Cc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  P9S:
    id: P9S
    name: dihydroxypropylcysteine
    synonyms:
    - C
    - (2~{R})-2-azanyl-3-[(2~{R})-2,3-bis(oxidanyl)propyl]sulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: P9S
    structure: OC[C@H](CSC[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  PAQ:
    id: PAQ
    name: 2-oxy-4-hydroxy-5-(2-hydrazinopyridine)phenylalanine
    synonyms:
    - 3-[(1R)-4-hydroxy-6-oxo-3-(2-pyridin-2-ylhydrazino)cyclohexa-2,4-dien-1-yl]-L-alanine
    - (2S)-2-amino-3-[4-hydroxy-6-oxo-3-(2-pyridin-2-ylhydrazinyl)-1-cyclohexa-2,4-dienyl]propanoic
      acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: PAQ
    structure: '[O-]C(=O)[C@H](C[C-]1C=C([NH2+]Nc2cccc[nH+]2)C(=CC1=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
    - molecule: Monomer
      element: H
      position: 26
      charge: 1
  PAT:
    id: PAT
    name: alpha-phosphono-tryptophan
    synonyms:
    - (2R)-2-amino-3-(1H-indol-3-yl)-2-phosphono-propanoic acid
    - alpha-phosphono-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: PAT
    structure: '[O-]C(=O)[C@](P(=O)([O-])[O-])(Cc1c[nH]c2c1cccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  PBB:
    id: PBB
    name: s-(4-bromobenzyl)cysteine
    synonyms:
    - (2R)-2-amino-3-[(4-bromophenyl)methylsulfanyl]propanoic acid
    - C
    - S-(4-bromobenzyl)-L-cysteine
    identifiers:
    - ns: pdb-ccd
      id: PBB
    structure: '[NH3+][C@H](C(=O)[O-])CSCc1ccc(cc1)Br'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PBF:
    id: PBF
    name: para-(benzoyl)-phenylalanine
    synonyms:
    - F
    - 4-(phenylcarbonyl)-L-phenylalanine
    - (2S)-2-amino-3-[4-(phenylcarbonyl)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PBF
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C(=O)c1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PCE:
    id: PCE
    name: 2-(3-amino-4-cyclohexyl-2-hydroxy-butyl)-pent-4-ynoic acid
    synonyms:
    - (2R,4R,5S)-5-amino-6-cyclohexyl-4-hydroxy-2-prop-2-yn-1-ylhexanoic acid
    - X
    - (4R,5S)-5-amino-6-cyclohexyl-4-hydroxy-2-prop-2-ynyl-hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PCE
    structure: C#CCC(C(=O)[O-])C[C@H]([C@H](CC1CCCCC1)[NH3+])O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  PCS:
    id: PCS
    name: phenylalanylmethylchloride
    synonyms:
    - F
    - (3S)-3-amino-1-chloro-4-phenyl-butan-2-one
    - (3S)-3-amino-1-chloro-4-phenylbutan-2-one
    identifiers:
    - ns: pdb-ccd
      id: PCS
    structure: ClCC(=O)[C@H](Cc1ccccc1)[NH3+]
    base_monomers:
    - F
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  PE1:
    id: PE1
    name: n~2~-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methyl)-l-lysine
    synonyms:
    - N~2~-({3-hydroxy-2-methyl-5-[(phosphonooxy)methyl]pyridin-4-yl}methyl)-L-lysine
    - (2S)-6-azanyl-2-[[2-methyl-3-oxidanyl-5-(phosphonooxymethyl)pyridin-4-yl]methylamino]hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: PE1
    structure: '[NH3+]CCCC[C@@H](C(=O)[O-])[NH2+]Cc1c(cnc(c1O)C)COP(=O)([O-])[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  PEC:
    id: PEC
    name: s,s-pentylthiocysteine
    synonyms:
    - (2R)-2-amino-3-pentyldisulfanyl-propanoic acid
    - 3-(pentyldisulfanyl)-L-alanine
    - C
    identifiers:
    - ns: pdb-ccd
      id: PEC
    structure: CCCCCSSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  PF5:
    id: PF5
    name: 2,3,4,5,6-pentafluoro-l-phenylalanine
    synonyms:
    - F
    - 2,3,4,5,6-pentafluoro-L-phenylalanine
    - (2S)-2-amino-3-(2,3,4,5,6-pentafluorophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PF5
    structure: '[NH3+][C@H](C(=O)[O-])Cc1c(F)c(F)c(c(c1F)F)F'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PFF:
    id: PFF
    name: 4-fluoro-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-amino-3-(4-fluorophenyl)propanoic acid
    - 4-fluoro-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: PFF
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)F'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PFX:
    id: PFX
    name: (2s)-1-({2-[2-(carboxymethoxy)ethoxy]ethyl}amino)-1-oxo-3-(4-phosphonophenyl)propan-2-aminium
    synonyms:
    - (2S)-1-({2-[2-(carboxymethoxy)ethoxy]ethyl}amino)-1-oxo-3-(4-phosphonophenyl)propan-2-aminium
    - '[(2S)-1-[2-[2-(carboxymethyloxy)ethoxy]ethylamino]-1-oxo-3-(4-phosphonophenyl)propan-2-yl]azanium'
    - X
    identifiers:
    - ns: pdb-ccd
      id: PFX
    structure: '[O-]C(=O)COCCOCCNC(=O)[C@H](Cc1ccc(cc1)P(=O)([O-])[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  PG1:
    id: PG1
    name: penicillin g acyl-serine
    synonyms:
    - S
    - (2R,4S)-2-[(1R)-2-[(2S)-2-amino-3-oxido-3-oxo-propoxy]-2-oxo-1-(2-phenylethanoylamino)ethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylate
    - (2R,4S)-2-{(1R)-2-[(2S)-2-amino-2-carboxylatoethoxy]-2-oxo-1-[(phenylacetyl)amino]ethyl}-5,5-dimethyl-1,3-thiazolidine-4-carboxylate
    identifiers:
    - ns: pdb-ccd
      id: PG1
    structure: O=C(N[C@@H]([C@@H]1[NH2+][C@H](C(S1)(C)C)C(=O)[O-])C(=O)OC[C@@H](C(=O)[O-])[NH3+])Cc1ccccc1
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  PH6:
    id: PH6
    name: (4s)-4-cyclohexyl-l-proline
    synonyms:
    - P
    - (2S,4S)-4-cyclohexylpyrrolidine-2-carboxylic acid
    - (4S)-4-cyclohexyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: PH6
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@@H](C1)C1CCCCC1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  PH8:
    id: PH8
    name: 5-phenyl-l-norvaline
    synonyms:
    - 5-phenyl-L-norvaline
    - (2S)-2-azanyl-5-phenyl-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PH8
    structure: '[O-]C(=O)[C@H](CCCc1ccccc1)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  PHA:
    id: PHA
    name: phenylalaninal
    synonyms:
    - F
    - (2S)-2-amino-3-phenyl-propanal
    - (2S)-2-amino-3-phenylpropanal
    identifiers:
    - ns: pdb-ccd
      id: PHA
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccccc1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PHI:
    id: PHI
    name: iodo-phenylalanine
    synonyms:
    - F
    - 4-iodo-L-phenylalanine
    - (2S)-2-amino-3-(4-iodophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PHI
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)I'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  PHL:
    id: PHL
    name: l-phenylalaninol
    synonyms:
    - F
    - (2S)-2-amino-3-phenylpropan-1-ol
    - (2S)-2-amino-3-phenyl-propan-1-ol
    identifiers:
    - ns: pdb-ccd
      id: PHL
    structure: OC[C@H](Cc1ccccc1)[NH3+]
    base_monomers:
    - F
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  PIA:
    id: PIA
    name: '[(4z)-2-[(1s)-1-aminoethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - AYG
    - 2-[(4Z)-2-[(1S)-1-azanylethyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - '[(4Z)-2-[(1S)-1-aminoethyl]-4-(4-hydroxybenzylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: PIA
    structure: C[C@@H](C1=N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
  PIV:
    id: PIV
    name: pivalic acid
    synonyms:
    - 2,2-dimethylpropanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: PIV
    structure: '[O-]C(=O)C(C)(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  PLJ:
    id: PLJ
    name: methyl l-prolinate
    synonyms:
    - methyl (2S)-pyrrolidine-2-carboxylate
    - methyl L-prolinate
    identifiers:
    - ns: pdb-ccd
      id: PLJ
    structure: COC(=O)[C@@H]1CCC[NH2+]1
    base_monomers:
    - P
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  PM3:
    id: PM3
    name: 2-amino-3-(4-phosphonomethyl-phenyl)-propionic acid
    synonyms:
    - F
    - 4-(phosphonomethyl)-L-phenylalanine
    - (2S)-2-amino-3-[4-(phosphonomethyl)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PM3
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)CP(=O)(O)[O-])[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  PNZ:
    id: PNZ
    name: p-nitro-benzylamine
    synonyms:
    - (4-nitrophenyl)methanamine
    - 1-(4-nitrophenyl)methanamine
    identifiers:
    - ns: pdb-ccd
      id: PNZ
    structure: '[NH3+]Cc1ccc(cc1)[N+](=O)[O-]'
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  POM:
    id: POM
    name: cis-5-methyl-4-oxoproline
    synonyms:
    - P
    - (2S,5S)-5-methyl-4-oxo-pyrrolidine-2-carboxylic acid
    - (5S)-5-methyl-4-oxo-L-proline
    identifiers:
    - ns: pdb-ccd
      id: POM
    structure: '[O-]C(=O)[C@@H]1CC(=O)[C@@H]([NH2+]1)C'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  PPN:
    id: PPN
    name: para-nitrophenylalanine
    synonyms:
    - F
    - 4-nitro-L-phenylalanine
    - (2S)-2-amino-3-(4-nitrophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PPN
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)[N+](=O)[O-])[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  PR3:
    id: PR3
    name: s,s-propylthiocysteine
    synonyms:
    - (2R)-2-amino-3-(propyldisulfanyl)propanal
    - C
    - (2R)-2-amino-3-propyldisulfanyl-propanal
    identifiers:
    - ns: pdb-ccd
      id: PR3
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSCCC'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  PR4:
    id: PR4
    name: 1-[(2r)-2-carboxy-2-hydroxyethyl]-l-proline
    synonyms:
    - (1S,2S)-1-[(2R)-2,3-dihydroxy-3-oxo-propyl]pyrrolidine-2-carboxylic acid
    - 1-[(2R)-2-carboxy-2-hydroxyethyl]-L-proline
    identifiers:
    - ns: pdb-ccd
      id: PR4
    structure: O[C@@H](C(=O)[O-])C[NH+]1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
      charge: -1
  PR7:
    id: PR7
    name: 1-[(2s)-2-carboxy-2-hydroxyethyl]-l-proline
    synonyms:
    - (1S,2S)-1-[(2S)-2,3-dihydroxy-3-oxo-propyl]pyrrolidine-2-carboxylic acid
    - 1-[(2S)-2-carboxy-2-hydroxyethyl]-L-proline
    identifiers:
    - ns: pdb-ccd
      id: PR7
    structure: O[C@H](C(=O)[O-])C[NH+]1CCC[C@H]1C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
      charge: -1
  PRJ:
    id: PRJ
    name: (2s,3as,6r,7as)-6-hydroxyoctahydro-1h-indole-2-carboxylic acid
    synonyms:
    - (2S,3aS,6R,7aS)-6-hydroxy-2,3,3a,4,5,6,7,7a-octahydro-1H-indole-2-carboxylic
      acid
    - (2S,3aS,6R,7aS)-6-hydroxyoctahydro-1H-indole-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: PRJ
    structure: O[C@@H]1CC[C@@H]2[C@H](C1)[NH2+][C@@H](C2)C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  PRR:
    id: PRR
    name: 3-(methyl-pyridinium)alanine
    synonyms:
    - (2S)-2-azanyl-3-(1-methylpyridin-1-ium-3-yl)propanoic acid
    - 3-(1-methylpyridinium-3-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: PRR
    structure: '[O-]C(=O)[C@H](Cc1ccc[n+](c1)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  PRS:
    id: PRS
    name: thioproline
    synonyms:
    - P
    - (4R)-1,3-thiazolidine-4-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: PRS
    structure: '[O-]C(=O)[C@@H]1CSC[NH2+]1'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  PRV:
    id: PRV
    name: (2r)-amino(2-nitrophenyl)ethanoic acid
    synonyms:
    - G
    - (2R)-2-amino-2-(2-nitrophenyl)ethanoic acid
    - (2R)-amino(2-nitrophenyl)ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PRV
    structure: '[O-]C(=O)[C@@H](c1ccccc1[N+](=O)[O-])[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  PSH:
    id: PSH
    name: 1-thiophosphono-l-histidine
    synonyms:
    - (2S)-2-amino-3-[1-(hydroxy-sulfanyl-phosphoryl)imidazol-4-yl]propanoic acid
    - 1-thiophosphono-L-histidine
    - H
    identifiers:
    - ns: pdb-ccd
      id: PSH
    structure: '[O-]C(=O)[C@H](Cc1ncn(c1)P(=O)(S)[O-])[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  PSW:
    id: PSW
    name: 3-(sulfanylselanyl)-l-alanine
    synonyms:
    - U
    - 3-(sulfanylselanyl)-L-alanine
    - (2R)-2-amino-3-sulfanylselanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PSW
    structure: '[O-]C(=O)[C@@H]([NH3+])C[Se]S'
    base_monomers:
    - SEC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  PTH:
    id: PTH
    name: ce1-methylene-hydroxy-phosphotyrosine
    synonyms:
    - 3-(hydroxymethyl)-O-phosphono-L-tyrosine
    - Y
    - (2S)-2-amino-3-[3-(hydroxymethyl)-4-phosphonooxy-phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PTH
    structure: OCc1cc(ccc1OP(=O)([O-])[O-])C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  PTM:
    id: PTM
    name: alpha-methyl-o-phosphotyrosine
    synonyms:
    - (2S)-2-amino-2-methyl-3-(4-phosphonooxyphenyl)propanoic acid
    - Y
    - alpha-methyl-O-phosphono-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: PTM
    structure: '[O-]C(=O)[C@](Cc1ccc(cc1)OP(=O)([O-])[O-])([NH3+])C'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  PVH:
    id: PVH
    name: histidine-methyl-ester
    synonyms:
    - H
    - methyl (2S)-2-amino-3-(1H-imidazol-3-ium-4-yl)propanoate
    - methyl 3-(1H-imidazol-3-ium-4-yl)-L-alaninate
    identifiers:
    - ns: pdb-ccd
      id: PVH
    structure: COC(=O)[C@H](Cc1c[nH]cn1)N
    base_monomers:
    - H
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  PVO:
    id: PVO
    name: 2,2-bis(oxidanyl)propanoic acid
    synonyms:
    - 2,2-bis(oxidanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PVO
    structure: '[O-]C(=O)C(O)(O)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  PYA:
    id: PYA
    name: 3-(1,10-phenanthrol-2-yl)-l-alanine
    synonyms:
    - A
    - 3-(1,10-phenanthrolin-2-yl)-L-alanine
    - (2S)-2-amino-3-(1,10-phenanthrolin-2-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: PYA
    structure: '[O-]C(=O)[C@H](Cc1ccc2c(n1)c1ncccc1cc2)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  PYL:
    id: PYL
    name: pyrrolysine
    synonyms:
    - N~6~-{[(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrol-2-yl]carbonyl}-L-lysine
    - (2S)-2-azanyl-6-[[(2R,3R)-3-methyl-3,4-dihydro-2H-pyrrol-2-yl]carbonylamino]hexanoic
      acid
    - O
    identifiers:
    - ns: pdb-ccd
      id: PYL
    structure: '[O-]C(=O)[C@H](CCCCNC(=O)[C@@H]1N=CC[C@H]1C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  PYX:
    id: PYX
    name: s-[s-thiopyridoxaminyl]cysteine
    synonyms:
    - 3-({[4-(aminomethyl)-5-hydroxy-6-methylpyridin-3-yl]methyl}disulfanyl)-L-alanine
    - C
    - (2R)-2-amino-3-[[4-(aminomethyl)-5-hydroxy-6-methyl-pyridin-3-yl]methyldisulfanyl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: PYX
    structure: '[NH3+]Cc1c(CSSC[C@@H](C(=O)[O-])[NH3+])cnc(c1O)C'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  QAC:
    id: QAC
    name: n-[4-(hydroxymethyl)benzoyl]-beta-alanine
    synonyms:
    - N-[4-(hydroxymethyl)benzoyl]-beta-alanine
    - 3-[[4-(hydroxymethyl)phenyl]carbonylamino]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: QAC
    structure: OCc1ccc(cc1)C(=O)NCCC(=O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  QFG:
    id: QFG
    name: '{(4e)-2-[(1e)-4-amino-4-oxobutanimidoyl]-4-benzylidene-5-oxo-4,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - 2-[(4E)-2-(4-azanyl-4-oxidanylidene-butanimidoyl)-5-oxidanylidene-4-(phenylmethylidene)imidazol-1-yl]ethanoic
      acid
    - '{(4E)-2-[(1E)-4-amino-4-oxobutanimidoyl]-4-benzylidene-5-oxo-4,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - QFG
    identifiers:
    - ns: pdb-ccd
      id: QFG
    structure: '[O-]C(=O)CN1C(=N/C(=C/c2ccccc2)/C1=O)C(=N)CCC(=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  QIL:
    id: QIL
    name: n-formyl-l-isoleucine
    synonyms:
    - (2S,3S)-2-formamido-3-methyl-pentanoic acid
    - N-formyl-L-isoleucine
    identifiers:
    - ns: pdb-ccd
      id: QIL
    structure: '[O-]C(=O)[C@H]([C@H](CC)C)NC=O'
    base_monomers:
    - I
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  QLG:
    id: QLG
    name: '[(4z)-2-[(1z)-4-amino-4-oxobutanimidoyl]-4-(2-methylpropylidene)-5-oxo-4,5-dihydro-1h-imidazol-1-yl]acetic
      acid'
    synonyms:
    - '[(4E)-2-[(1Z)-4-amino-4-oxobutanimidoyl]-4-(2-methylpropylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]acetic
      acid'
    - 2-[2-(4-amino-4-oxo-butanimidoyl)-4-(2-methylpropylidene)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - QLG
    identifiers:
    - ns: pdb-ccd
      id: QLG
    structure: '[O-]C(=O)CN1C(=NC(=CC(C)C)C1=O)C(=N)CCC(=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  QMM:
    id: QMM
    name: n,n-dimethyl-l-glutamine
    synonyms:
    - N,N-dimethyl-L-glutamine
    - Q
    - (2S)-2-azanyl-5-(dimethylamino)-5-oxo-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: QMM
    structure: '[O-]C(=O)[C@H](CCC(=O)N(C)C)[NH3+]'
    base_monomers:
    - Q
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  QPH:
    id: QPH
    name: n-formyl-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-formamido-3-phenyl-propanoic acid
    - N-formyl-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: QPH
    structure: O=CN[C@H](C(=O)[O-])Cc1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 3
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 3
  R1A:
    id: R1A
    name: 3-{[(2,2,5,5-tetramethyl-1-oxo-2,5-dihydro-1h-pyrrolium-3-yl)methyl]disulfanyl}-d-alanine
    synonyms:
    - 3-{[(2,2,5,5-tetramethyl-1-oxo-2,5-dihydro-1H-pyrrolium-3-yl)methyl]disulfanyl}-L-alanine
    - (2R)-2-amino-3-[(2,2,5,5-tetramethyl-1-oxo-pyrrol-1-ium-3-yl)methyldisulfanyl]propanoic
      acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: R1A
    structure: '[O-]C(=O)[C@H](CSSCC1=CC([N+](=O)C1(C)C)(C)C)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  R2T:
    id: R2T
    name: beta,gamma-dihydroxyglutamine
    synonyms:
    - (2S,3R,4S)-2,5-bis(azanyl)-3,4-bis(oxidanyl)-5-oxidanylidene-pentanoic acid
    - (2S,3R,4S)-2,5-diamino-3,4-dihydroxy-5-oxopentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: R2T
    structure: '[NH3+][C@@H]([C@H]([C@@H](C(=O)N)O)O)C(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 18
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  R4K:
    id: R4K
    name: (2s,3r)-2-azanyl-3-hydroxy-3-[(3s)-3-hydroxy-2-oxo-1h-indol-3-yl]propanoic
      acid
    synonyms:
    - (3R)-3-[(3S)-3-hydroxy-2-oxo-2,3-dihydro-1H-indol-3-yl]-L-serine
    - (2S,3R)-2-azanyl-3-oxidanyl-3-[(3S)-3-oxidanyl-2-oxidanylidene-1H-indol-3-yl]propanoic
      acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: R4K
    structure: '[O-]C(=O)[C@H]([C@H]([C@]1(O)C(=O)Nc2c1cccc2)O)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  RC7:
    id: RC7
    name: '{(2r)-4-(4-hydroxybenzyl)-2-[2-(1h-imidazol-4-yl)ethyl]-5-oxo-2,5-dihydro-1h-imidazol-1-yl}acetaldehyde'
    synonyms:
    - 2-[4-[(4-hydroxyphenyl)methyl]-2-[2-(1H-imidazol-4-yl)ethyl]-5-oxo-2H-imidazol-1-yl]ethanoic
      acid
    - HYG
    - '{(2R)-4-(4-hydroxybenzyl)-2-[2-(1H-imidazol-4-yl)ethyl]-5-oxo-2,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: RC7
    structure: '[O-]C(=O)CN1C(CCc2c[nH]cn2)N=C(C1=O)Cc1ccc(cc1)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
  RE0:
    id: RE0
    name: 3-[(3r)-3-hydroxy-2-oxo-2,3-dihydro-1h-indol-3-yl]-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[(3R)-3-hydroxy-2-oxo-1H-indol-3-yl]propanoic acid
    - 3-[(3R)-3-hydroxy-2-oxo-2,3-dihydro-1H-indol-3-yl]-L-alanine
    - W
    identifiers:
    - ns: pdb-ccd
      id: RE0
    structure: '[O-]C(=O)[C@H](C[C@]1(O)C(=O)Nc2c1cccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  RE3:
    id: RE3
    name: 3-[(3s)-3-hydroxy-2-oxo-2,3-dihydro-1h-indol-3-yl]-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[(3S)-3-hydroxy-2-oxo-1H-indol-3-yl]propanoic acid
    - 3-[(3S)-3-hydroxy-2-oxo-2,3-dihydro-1H-indol-3-yl]-L-alanine
    - W
    identifiers:
    - ns: pdb-ccd
      id: RE3
    structure: '[O-]C(=O)[C@H](C[C@@]1(O)C(=O)Nc2c1cccc2)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  RGL:
    id: RGL
    name: arginal
    synonyms:
    - amino{[(4S)-4-amino-5-oxopentyl]amino}methaniminium
    - '[amino-[[(4S)-4-amino-5-oxo-pentyl]amino]methylidene]azanium'
    - R
    identifiers:
    - ns: pdb-ccd
      id: RGL
    structure: '[O-]C(=O)[C@H](CCCNC(=[NH2+])N)[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  RPI:
    id: RPI
    name: phospho-arginine
    synonyms:
    - (2~{S})-2-azanyl-5-[(~{N}-phosphonocarbamimidoyl)amino]pentanoic acid
    - R
    identifiers:
    - ns: pdb-ccd
      id: RPI
    structure: '[O-]C(=O)[C@H](CCCNC(=[NH2+])NP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  RT0:
    id: RT0
    name: (2s,4s)-4-[4-(4-fluorophenyl)-1,2,3-triazol-1-yl]pyrrolidine-2-carboxylic
      acid
    synonyms:
    - (2S,4S)-4-[4-(4-fluorophenyl)-1,2,3-triazol-1-yl]pyrrolidine-2-carboxylic acid
    - (4S)-4-[4-(4-fluorophenyl)-1H-1,2,3-triazol-1-yl]-L-proline
    identifiers:
    - ns: pdb-ccd
      id: RT0
    structure: '[O-]C(=O)[C@H]1[NH2+]C[C@H](C1)n1nnc(c1)c1ccc(cc1)F'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  RVX:
    id: RVX
    name: o-[methyl(2-methylpropoxy)phosphoryl]-l-serine
    synonyms:
    - S
    - O-[(R)-methyl(2-methylpropoxy)phosphoryl]-L-serine
    - (2S)-2-azanyl-3-[methyl(2-methylpropoxy)phosphoryl]oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: RVX
    structure: '[NH3+][C@H](C(=O)[O-])CO[P@](=O)(OCC(C)C)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  RZ4:
    id: RZ4
    name: o-tert-butyl-l-serine
    synonyms:
    - S
    - (2S)-2-azanyl-3-[(2-methylpropan-2-yl)oxy]propanoic acid
    - O-tert-butyl-L-serine
    identifiers:
    - ns: pdb-ccd
      id: RZ4
    structure: '[NH3+][C@H](C(=O)[O-])COC(C)(C)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  S12:
    id: S12
    name: o-[(s)-hydroxy{[(2s)-2-hydroxy-3-(octadec-9-enoyloxy)propyl]oxy}phosphoryl]-l-serine
    synonyms:
    - (2S)-2-azanyl-3-[[(2S)-3-octadec-9-enoyloxy-2-oxidanyl-propoxy]-oxidanyl-phosphoryl]oxy-propanoic
      acid
    - O-[(S)-hydroxy{[(2S)-2-hydroxy-3-(octadec-9-enoyloxy)propyl]oxy}phosphoryl]-L-serine
    identifiers:
    - ns: pdb-ccd
      id: S12
    structure: CCCCCCCCC=CCCCCCCCC(=O)OC[C@@H](CO[P@](=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-])O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 35
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 34
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 35
    - molecule: Monomer
      element: H
      position: 35
      charge: 1
  S1H:
    id: S1H
    name: 1-hexadecanosulfonyl-o-l-serine
    synonyms:
    - S
    - O-(hexadecylsulfonyl)-L-serine
    - (2S)-2-amino-3-hexadecylsulfonyloxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: S1H
    structure: CCCCCCCCCCCCCCCCS(=O)(=O)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 27
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    - molecule: Monomer
      element: H
      position: 27
      charge: 1
  S2C:
    id: S2C
    name: s-2-(boronoethyl)-l-cysteine
    synonyms:
    - (2-{[(2R)-2-amino-2-carboxyethyl]sulfanyl}ethyl)(trihydroxy)borate(1-)
    - 2-[(2R)-2-azanyl-3-hydroxy-3-oxo-propyl]sulfanylethyl-trihydroxy-boranuide
    - C
    identifiers:
    - ns: pdb-ccd
      id: S2C
    structure: '[O-]C(=O)[C@H](CSCC[B-](O)(O)O)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  S2P:
    id: S2P
    name: (2s)-2-amino-3-(4-hydroxy-1,2,5-thiadiazol-3-yl)propanoic acid
    synonyms:
    - A
    - (2S)-2-amino-3-(4-hydroxy-1,2,5-thiadiazol-3-yl)propanoic acid
    - 3-(4-hydroxy-1,2,5-thiadiazol-3-yl)-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: S2P
    structure: '[O-]C(=O)[C@H](Cc1nsnc1[O-])[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  SAH:
    id: SAH
    name: s-adenosyl-l-homocysteine
    synonyms:
    - (2S)-2-amino-4-[[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methylsulfanyl]butanoic
      acid
    - C
    - (2S)-2-amino-4-({[(2S,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl}sulfanyl)butanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: SAH
    structure: '[O-]C(=O)[C@H](CCSC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  SAO:
    id: SAO
    name: 5'-s-[(3s)-3-azaniumyl-3-carboxypropyl]-5'-thioadenosine
    synonyms:
    - '[(2~{S})-4-[[(2~{S},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methylsulfanyl]-1-oxidanyl-1-oxidanylidene-butan-2-yl]azanium'
    - 5'-S-[(3S)-3-azaniumyl-3-carboxypropyl]-5'-thioadenosine
    identifiers:
    - ns: pdb-ccd
      id: SAO
    structure: '[O-]C(=O)[C@H](CCSC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 31
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    - molecule: Monomer
      element: H
      position: 31
      charge: 1
  SBL:
    id: SBL
    name: l-naphthyl-1-acetamido boronic acid alanine
    synonyms:
    - S
    - '[(1R)-1-(acetylamino)-2-naphthalen-1-ylethyl](dihydroxy)(L-serinato-kappaO~3~)borate(1-)'
    - '[(1R)-1-acetamido-2-naphthalen-1-yl-ethyl]-[(2S)-2-amino-3-hydroxy-3-oxo-propoxy]-dihydroxy-boron'
    identifiers:
    - ns: pdb-ccd
      id: SBL
    structure: CC(=O)N[C@H]([B-](OC[C@@H](C(=O)[O-])[NH3+])(O)O)Cc1cccc2c1cccc2
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  SCS:
    id: SCS
    name: 3-(ethyldisulfanyl)-l-alanine
    synonyms:
    - 3-(ethyldisulfanyl)-L-alanine
    - C
    - (2R)-2-amino-3-ethyldisulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SCS
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSCC'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SD2:
    id: SD2
    name: n-(sulfanylacetyl)tyrosylprolylmethioninamide
    synonyms:
    - N-(sulfanylacetyl)-L-tyrosyl-L-prolyl-L-methioninamide
    - X
    - (2S)-N-[(2S)-1-amino-4-methylsulfanyl-1-oxo-butan-2-yl]-1-[(2S)-3-(4-hydroxyphenyl)-2-(2-sulfanylethanoylamino)propanoyl]pyrrolidine-2-carboxamide
    identifiers:
    - ns: pdb-ccd
      id: SD2
    structure: CSCC[C@@H](C(=O)N)NC(=O)[C@@H]1CCCN1C(=O)[C@H](Cc1ccc(cc1)O)NC(=O)CS
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  SD4:
    id: SD4
    name: n-hydroxy-l-asparagine
    synonyms:
    - (2S)-2-azanyl-4-(oxidanylamino)-4-oxidanylidene-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SD4
    structure: '[O-]C(=O)[C@@H]([NH3+])CC(=O)NO'
    base_monomers:
    - N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SDP:
    id: SDP
    name: 2-amino-3-(diethoxy-phosphoryloxy)-propionic acid
    synonyms:
    - S
    - (2S)-2-amino-3-diethoxyphosphoryloxy-propanoic acid
    - O-(diethoxyphosphoryl)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: SDP
    structure: CCOP(=O)(OCC)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  SE7:
    id: SE7
    name: 2-amino-3-selenino-propionic acid
    synonyms:
    - U
    - 3-selenino-L-alanine
    - (2R)-2-azanyl-3-selenino-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SE7
    structure: '[O-][Se](=O)C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - SEC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  SEB:
    id: SEB
    name: o-benzylsulfonyl-serine
    synonyms:
    - S
    - (2S)-2-amino-3-(phenylmethylsulfonyloxy)propanoic acid
    - O-(benzylsulfonyl)-L-serine
    identifiers:
    - ns: pdb-ccd
      id: SEB
    structure: '[NH3+][C@H](C(=O)[O-])COS(=O)(=O)Cc1ccccc1'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  SEC:
    id: SEC
    name: selenocysteine
    synonyms:
    - U
    - 3-selanyl-L-alanine
    - (2R)-2-azanyl-3-selanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SEC
    structure: '[O-]C(=O)[C@@H]([NH3+])C[SeH]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
    base_monomers:
    - C
  SEE:
    id: SEE
    name: trihydroxy(l-serinato-kappao~3~)borate(1-)
    synonyms:
    - trihydroxy(L-serinato-kappaO~3~)borate(1-)
    - '[(2S)-2-amino-3-hydroxy-3-oxo-propoxy]-trihydroxy-boron'
    identifiers:
    - ns: pdb-ccd
      id: SEE
    structure: O[B-](OC[C@@H](C(=O)[O-])[NH3+])(O)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  SEL:
    id: SEL
    name: 2-amino-1,3-propanediol
    synonyms:
    - S
    - 2-aminopropane-1,3-diol
    - 2-azanylpropane-1,3-diol
    identifiers:
    - ns: pdb-ccd
      id: SEL
    structure: OCC(CO)[NH3+]
    base_monomers:
    - S
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SEM:
    id: SEM
    name: o-benzyl-l-serine
    synonyms:
    - S
    - (2S)-2-azanyl-3-phenylmethoxy-propanoic acid
    - O-benzyl-L-serine
    identifiers:
    - ns: pdb-ccd
      id: SEM
    structure: '[NH3+][C@H](C(=O)[O-])COCc1ccccc1'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  SEN:
    id: SEN
    name: o-[n,n-dimethylphosphoramidate]-l-serine
    synonyms:
    - S
    - O-[(S)-(dimethylamino)(hydroxy)phosphoryl]-L-serine
    - (2S)-2-amino-3-(dimethylamino-hydroxy-phosphoryl)oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SEN
    structure: '[NH3+][C@H](C(=O)[O-])COP(=O)(N(C)C)[O-]'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  SGB:
    id: SGB
    name: o-[(s)-methyl(1-methylethoxy)phosphoryl]-l-serine
    synonyms:
    - S
    - O-[(S)-methyl(1-methylethoxy)phosphoryl]-L-serine
    - (2S)-2-amino-3-(methyl-propan-2-yloxy-phosphoryl)oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SGB
    structure: '[NH3+][C@H](C(=O)[O-])CO[P@](=O)(OC(C)C)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  SHC:
    id: SHC
    name: s-hexylcysteine
    synonyms:
    - (2R)-2-amino-3-hexylsulfanyl-propanoic acid
    - S-hexyl-L-cysteine
    - C
    identifiers:
    - ns: pdb-ccd
      id: SHC
    structure: CCCCCCSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  SHP:
    id: SHP
    name: (4-hydroxymaltosephenyl)glycine
    synonyms:
    - G
    - (2S)-amino{4-[(2-O-alpha-D-mannopyranosyl-alpha-D-mannopyranosyl)oxy]phenyl}ethanoic
      acid
    - (2S)-2-amino-2-[4-[(2R,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-oxan-2-yl]oxyphenyl]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: SHP
    structure: OC[C@H]1O[C@H](Oc2ccc(cc2)[C@@H](C(=O)[O-])[NH3+])[C@H]([C@H]([C@@H]1O)O)O[C@H]1O[C@H](CO)[C@H]([C@@H]([C@@H]1O)O)O
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  SHR:
    id: SHR
    name: n-(5-amino-5-carboxypentyl)glutamic acid
    synonyms:
    - (2S)-2-[[(5S)-5-amino-6-hydroxy-6-oxo-hexyl]amino]pentanedioic acid
    - K
    - N-[(5S)-5-amino-5-carboxypentyl]-L-glutamic acid
    identifiers:
    - ns: pdb-ccd
      id: SHR
    structure: '[O-]C(=O)CC[C@@H](C(=O)[O-])[NH2+]CCCC[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  SIB:
    id: SIB
    name: (2s)-2-amino-4-({[(2s,3s,4r,5r)-3,4-dihydroxy-5-(6-oxo-1,6-dihydro-9h-purin-9-yl)tetrahydrofuran-2-yl]methyl}thio)butanoic
      acid
    synonyms:
    - (2S)-2-amino-4-[[(2S,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1H-purin-9-yl)oxolan-2-yl]methylsulfanyl]butanoic
      acid
    - (2S)-2-amino-4-({[(2S,3S,4R,5R)-3,4-dihydroxy-5-(6-oxo-1,6-dihydro-9H-purin-9-yl)tetrahydrofuran-2-yl]methyl}sulfanyl)butanoic
      acid (non-preferred name)
    - C
    identifiers:
    - ns: pdb-ccd
      id: SIB
    structure: '[O-]C(=O)[C@H](CCSC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1nc[nH]c2=O)[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 32
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    - molecule: Monomer
      element: H
      position: 32
      charge: 1
  SKH:
    id: SKH
    name: (3~{s})-5-[[(5~{s})-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]amino]-3-methyl-3-oxidanyl-5-oxidanylidene-pentanoic
      acid
    synonyms:
    - (3~{S})-5-[[(5~{S})-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]amino]-3-methyl-3-oxidanyl-5-oxidanylidene-pentanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: SKH
    structure: O=C(C[C@@](CC(=O)[O-])(O)C)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  SLL:
    id: SLL
    name: (2s)-2-azanyl-6-[(4-hydroxy-4-oxo-butanoyl)amino]hexanoic acid
    synonyms:
    - (2S)-2-azanyl-6-[(4-hydroxy-4-oxo-butanoyl)amino]hexanoic acid
    - N~6~-(3-carboxypropanoyl)-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: SLL
    structure: O=C(CCC(=O)[O-])NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  SLZ:
    id: SLZ
    name: l-thialysine
    synonyms:
    - S-(2-aminoethyl)-L-cysteine
    - (2R)-2-amino-3-(2-aminoethylsulfanyl)propanoic acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: SLZ
    structure: '[O-]C(=O)[C@@H]([NH3+])CSCC[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SMF:
    id: SMF
    name: 4-sulfomethyl-l-phenylalanine
    synonyms:
    - F
    - 4-(sulfomethyl)-L-phenylalanine
    - (2S)-2-amino-3-[4-(sulfomethyl)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SMF
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)CS(=O)(=O)[O-])[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  SOC:
    id: SOC
    name: dioxyselenocysteine
    synonyms:
    - 3-(dioxidoselanyl)-L-alanine
    - U
    identifiers:
    - ns: pdb-ccd
      id: SOC
    structure: O=[Se-](=O)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - SEC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  SRZ:
    id: SRZ
    name: propoxy-l-serine
    synonyms:
    - S
    - O-(3-hydroxypropyl)-L-serine
    - (2S)-2-azanyl-3-(3-oxidanylpropoxy)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SRZ
    structure: OCCCOC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  SUB:
    id: SUB
    name: 3-phenyl-2-{[4-(toluene-4-sulfonyl)-thiomorpholine-3-carbonyl]-amino}-propionic
      acid ethyl ester
    synonyms:
    - ethyl 2-[[(3R,4R)-4-(4-methylphenyl)sulfonylthiomorpholin-3-yl]carbonylamino]-3-phenyl-propanoate
    - X
    - ethyl N-({(3R)-4-[(4-methylphenyl)sulfonyl]thiomorpholin-3-yl}carbonyl)-L-phenylalaninate
    identifiers:
    - ns: pdb-ccd
      id: SUB
    structure: CCOC(=O)C(Cc1ccccc1)NC(=O)[C@@H]1CSCCN1S(=O)(=O)c1ccc(cc1)C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
  SUI:
    id: SUI
    name: (3-amino-2,5-dioxo-1-pyrrolidinyl)acetic acid
    synonyms:
    - '[(3S)-3-amino-2,5-dioxopyrrolidin-1-yl]acetic acid'
    - 2-[(3S)-3-amino-2,5-dioxo-pyrrolidin-1-yl]ethanoic acid
    - DG
    identifiers:
    - ns: pdb-ccd
      id: SUI
    structure: '[O-]C(=O)CN1C(=O)C[C@@H](C1=O)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  SUN:
    id: SUN
    name: o-[(r)-(dimethylamino)(ethoxy)phosphoryl]-l-serine
    synonyms:
    - S
    - O-[(R)-(dimethylamino)(ethoxy)phosphoryl]-L-serine
    - (2S)-2-amino-3-(dimethylamino-ethoxy-phosphoryl)oxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SUN
    structure: CCO[P@](=O)(N(C)C)OC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  SVX:
    id: SVX
    name: o-[(r)-ethoxy(methyl)phosphoryl]-l-serine
    synonyms:
    - (2S)-2-azanyl-3-[ethoxy(methyl)phosphoryl]oxy-propanoic acid
    - S
    - O-[(R)-ethoxy(methyl)phosphoryl]-L-serine
    identifiers:
    - ns: pdb-ccd
      id: SVX
    structure: '[O-]C(=O)[C@@H]([NH3+])CO[P@](=O)(OCC)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SVY:
    id: SVY
    name: o-[bis(1-methylethoxy)phosphoryl]-l-serine
    synonyms:
    - S
    - O-[bis(propan-2-yloxy)phosphoryl]-L-serine
    - (2S)-2-azanyl-3-di(propan-2-yloxy)phosphoryloxy-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: SVY
    structure: '[NH3+][C@H](C(=O)[O-])COP(=O)(OC(C)C)OC(C)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  SWG:
    id: SWG
    name: 2-[(4z)-2-[(1r)-1-amino-2-hydroxy-ethyl]-4-(1h-indol-3-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic
      acid
    synonyms:
    - 2-[(4Z)-2-[(1R)-1-amino-2-hydroxy-ethyl]-4-(1H-indol-3-ylmethylidene)-5-oxo-imidazol-1-yl]ethanoic
      acid
    - SWG
    identifiers:
    - ns: pdb-ccd
      id: SWG
    structure: OC[C@@H](C1=N/C(=C\c2c[nH]c3c2cccc3)/C(=O)N1CC(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  SYS:
    id: SYS
    name: 3-[(2-amino-2-oxoethyl)selanyl]-l-alanine
    synonyms:
    - (2R)-2-amino-3-(2-amino-2-oxo-ethyl)selanyl-propanoic acid
    - U
    - 3-[(2-amino-2-oxoethyl)selanyl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: SYS
    structure: NC(=O)C[Se]C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - SEC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  T0I:
    id: T0I
    name: (2s)-2-amino-3-(2,4-dihydroxy-5-imidazol-1-yl-phenyl)propanoic acid
    synonyms:
    - (2S)-2-amino-3-(2,4-dihydroxy-5-imidazol-1-yl-phenyl)propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: T0I
    structure: '[O-]C(=O)[C@H](Cc1cc(c(cc1O)O)n1cncc1)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  T11:
    id: T11
    name: 4-[3-(trifluoromethyl)diaziridin-3-yl]-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-amino-3-[4-[3-(trifluoromethyl)-1,2-diaziridin-3-yl]phenyl]propanoic
      acid
    - 4-[3-(trifluoromethyl)diaziridin-3-yl]-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: T11
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)C1(NN1)C(F)(F)F'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  T66:
    id: T66
    name: 2-aminoethyllysine-carbonylmethylene-thymine
    synonyms:
    - (2R)-6-amino-2-[2-aminoethyl-[2-(5-methyl-2,4-dioxo-pyrimidin-1-yl)ethanoyl]amino]hexanoic
      acid
    - X
    - N~2~-(2-aminoethyl)-N~2~-[(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)acetyl]-D-lysine
    identifiers:
    - ns: pdb-ccd
      id: T66
    structure: '[NH3+]CCN([C@@H](C(=O)[O-])CCCC[NH3+])C(=O)Cn1cc(C)c(=O)[nH]c1=O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  T8L:
    id: T8L
    name: thio-phosohothreonine
    synonyms:
    - (2~{S},3~{R})-2-azanyl-3-[oxidanyl(sulfanyl)phosphoryl]oxy-butanoic acid
    - T
    identifiers:
    - ns: pdb-ccd
      id: T8L
    structure: '[O-]C(=O)[C@H]([C@H](OP(=O)(O)[S-])C)[NH3+]'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  TA4:
    id: TA4
    name: (s)-2-[4-(aminomethyl)-1h-1,2,3-triazol-1-yl]-4-methylpentanoic acid
    synonyms:
    - (2S)-2-[4-(aminomethyl)-1,2,3-triazol-1-yl]-4-methyl-pentanoic acid
    - (2S)-2-[4-(aminomethyl)-1H-1,2,3-triazol-1-yl]-4-methylpentanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: TA4
    structure: '[NH3+]Cc1nnn(c1)[C@H](C(=O)[O-])CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TAV:
    id: TAV
    name: n-methyl-n-{2-[(2-naphthylsulfonyl)amino]-5-[(2-naphthylsulfonyl)oxy]benzoyl}-l-aspartic
      acid
    synonyms:
    - (2S)-2-[methyl-[2-(naphthalen-2-ylsulfonylamino)-5-naphthalen-2-ylsulfonyloxy-phenyl]carbonyl-amino]butanedioic
      acid
    - D
    - N-methyl-N-({2-[(naphthalen-2-ylsulfonyl)amino]-5-[(naphthalen-2-ylsulfonyl)oxy]phenyl}carbonyl)-L-aspartic
      acid
    identifiers:
    - ns: pdb-ccd
      id: TAV
    structure: '[O-]C(=O)C[C@H](N(C(=O)c1cc(ccc1[N-]S(=O)(=O)c1ccc2c(c1)cccc2)OS(=O)(=O)c1ccc2c(c1)cccc2)C)C(=O)[O-]'
    base_monomers:
    - D
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  TBG:
    id: TBG
    name: 3-methyl-l-valine
    synonyms:
    - V
    - (2S)-2-azanyl-3,3-dimethyl-butanoic acid
    - 3-methyl-L-valine
    identifiers:
    - ns: pdb-ccd
      id: TBG
    structure: '[NH3+][C@@H](C(C)(C)C)C(=O)[O-]'
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TCQ:
    id: TCQ
    name: (1s,2r)-n-{(1e)-5-[(2s)-2-amino-2-carboxyethyl]-2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene}-2-phenylcyclopropanaminium
    synonyms:
    - (1S,2R)-N-{(1E)-5-[(2S)-2-amino-2-carboxyethyl]-2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene}-2-phenylcyclopropanaminium
    - (E)-[5-[(2S)-2-azanyl-3-oxidanyl-3-oxidanylidene-propyl]-2-oxidanyl-4-oxidanylidene-cyclohexa-2,5-dien-1-ylidene]-[(1S,2R)-2-phenylcyclopropyl]azanium
    - Y
    identifiers:
    - ns: pdb-ccd
      id: TCQ
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N\[C@H]2C[C@@H]2c2ccccc2)/C(=CC1=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TCR:
    id: TCR
    name: cyclomethyltryptophan
    synonyms:
    - (3S)-2,3,4,9-tetrahydro-1H-beta-carboline-3-carboxylic acid
    - (3S)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: TCR
    structure: '[O-]C(=O)[C@H]1[NH2+]Cc2c(C1)c1ccccc1[nH]2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TEF:
    id: TEF
    name: 4-(2h-tetrazol-2-yl)-l-phenylalanine
    synonyms:
    - (2S)-2-azanyl-3-[4-(1,2,3,4-tetrazol-2-yl)phenyl]propanoic acid
    - 4-(2H-tetrazol-2-yl)-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: TEF
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)n1nncn1)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TFQ:
    id: TFQ
    name: 4-(2,2,2-trifluoroethyl)-l-phenylalanine
    synonyms:
    - F
    - 4-(2,2,2-trifluoroethyl)-L-phenylalanine
    - (2S)-2-amino-3-[4-(2,2,2-trifluoroethyl)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TFQ
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)CC(F)(F)F'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TH6:
    id: TH6
    name: 4-hydroxy-l-threonine
    synonyms:
    - (2S,3S)-2-amino-3,4-dihydroxy-butanoic acid
    - 4-hydroxy-L-threonine
    - T
    identifiers:
    - ns: pdb-ccd
      id: TH6
    structure: OC[C@H]([C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  THO:
    id: THO
    name: reduced threonine
    synonyms:
    - (2R,3R)-2-aminobutane-1,3-diol
    - X
    identifiers:
    - ns: pdb-ccd
      id: THO
    structure: OC[C@H]([C@H](O)C)[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  THZ:
    id: THZ
    name: 1-[(4s)-4-amino-5-(1,3-benzothiazol-2-yl)-5-oxopentyl]guanidine
    synonyms:
    - 1-[(4S)-4-amino-5-(1,3-benzothiazol-2-yl)-5-oxopentyl]guanidine
    - 1-[(4S)-4-azanyl-5-(1,3-benzothiazol-2-yl)-5-oxo-pentyl]guanidine
    - R
    identifiers:
    - ns: pdb-ccd
      id: THZ
    structure: NC(=[NH2+])NCCC[C@@H](C(=O)c1nc2c(s1)cccc2)N
    base_monomers:
    - R
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  TIH:
    id: TIH
    name: beta(2-thienyl)alanine
    synonyms:
    - A
    - 3-thiophen-2-yl-L-alanine
    - (2S)-2-amino-3-thiophen-2-yl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TIH
    structure: '[O-]C(=O)[C@H](Cc1cccs1)[NH3+]'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  TIS:
    id: TIS
    name: o-(1,1-dihydroxyethyl)-l-serine
    synonyms:
    - O-(1,1-dihydroxyethyl)-L-serine
    - (2S)-2-amino-3-(1,1-dihydroxyethoxy)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TIS
    structure: '[NH3+][C@H](C(=O)[O-])COC(O)(O)C'
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TLY:
    id: TLY
    name: (2s)-2-azanyl-6-(ethanethioylamino)hexanoic acid
    synonyms:
    - N~6~-ethanethioyl-L-lysine
    - (2S)-2-azanyl-6-(ethanethioylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TLY
    structure: CC(=S)NCCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  TMD:
    id: TMD
    name: (6,7-dihydro)4-[(e)-butenyl]-4,n-dimethyl-threonine
    synonyms:
    - (2S,3R,4R)-3-hydroxy-4-methyl-2-methylamino-octanoic acid
    - T
    - 4-butyl-2,4,5-trideoxy-2-(methylamino)-L-xylonic acid
    identifiers:
    - ns: pdb-ccd
      id: TMD
    structure: CCCC[C@H]([C@H]([C@@H](C(=O)[O-])[NH2+]C)O)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  TNB:
    id: TNB
    name: s-(2,3,6-trinitrophenyl)cysteine
    synonyms:
    - S-(2,4,6-trinitrophenyl)-L-cysteine
    - (2R)-2-amino-3-(2,4,6-trinitrophenyl)sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: TNB
    structure: '[O-]C(=O)[C@H](CSc1c(cc(cc1[N+](=O)[O-])[N+](=O)[O-])[N+](=O)[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  TNQ:
    id: TNQ
    name: 6-[(carboxymethyl)amino]-7-hydroxy-l-tryptophan
    synonyms:
    - (2~{S})-2-azanyl-3-[6-(2-hydroxy-2-oxoethylamino)-7-oxidanyl-1~{H}-indol-3-yl]propanoic
      acid
    - 6-[(carboxymethyl)amino]-7-hydroxy-L-tryptophan
    identifiers:
    - ns: pdb-ccd
      id: TNQ
    structure: '[O-]C(=O)CNc1ccc2c(c1O)[nH]cc2C[C@@H](C(=O)[O-])[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  TNR:
    id: TNR
    name: o-(2-acetamido-2-deoxy-alpha-d-galactopyranosyl)-l-serine
    synonyms:
    - (2S)-3-[(2S,3R,4R,5R,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2-amino-propanoic
      acid
    - S
    - (2S)-3-{[(2S,3R,4R,5R,6R)-3-(acetylamino)-4,5-dihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl]oxy}-2-aminopropanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: TNR
    structure: OC[C@H]1O[C@H](OC[C@@H](C(=O)[O-])[NH3+])[C@@H]([C@H]([C@H]1O)O)NC(=O)C
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  TOQ:
    id: TOQ
    name: 6,7-dihydroxy-l-tryptophan
    synonyms:
    - (2S)-2-azanyl-3-[6,7-bis(oxidanyl)-1H-indol-3-yl]propanoic acid
    - 6,7-dihydroxy-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: TOQ
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1ccc(c2O)O'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TOX:
    id: TOX
    name: 1-hydroperoxy-l-tryptophan
    synonyms:
    - 1-hydroperoxy-L-tryptophan
    - (2S)-2-azanyl-3-[1-(dioxidanyl)indol-3-yl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TOX
    structure: OOn1cc(c2c1cccc2)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TPJ:
    id: TPJ
    name: (5r)-5-tert-butyl-l-proline
    synonyms:
    - (2S,5R)-5-tert-butylpyrrolidine-2-carboxylic acid
    - (5R)-5-tert-butyl-L-proline
    identifiers:
    - ns: pdb-ccd
      id: TPJ
    structure: '[O-]C(=O)[C@@H]1CC[C@@H]([NH2+]1)C(C)(C)C'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  TPK:
    id: TPK
    name: (1r)-1-[(2s)-pyrrolidin-2-yl]ethane-1,2-diol
    synonyms:
    - (1R)-1-[(2S)-pyrrolidin-2-yl]ethane-1,2-diol
    identifiers:
    - ns: pdb-ccd
      id: TPK
    structure: OC[C@@H]([C@@H]1CCC[NH2+]1)O
    base_monomers:
    - P
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  TPL:
    id: TPL
    name: tryptophanol
    synonyms:
    - (2S)-2-amino-3-(1H-indol-3-yl)propan-1-ol
    - W
    identifiers:
    - ns: pdb-ccd
      id: TPL
    structure: OC[C@H](Cc1c[nH]c2c1cccc2)[NH3+]
    base_monomers:
    - W
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  TQI:
    id: TQI
    name: n-{[4-chloro-3-(trifluoromethyl)phenyl]sulfonyl}-l-tryptophan
    synonyms:
    - (2S)-2-[[4-chloro-3-(trifluoromethyl)phenyl]sulfonylamino]-3-(1H-indol-3-yl)propanoic
      acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: TQI
    structure: '[O-]C(=O)[C@@H](NS(=O)(=O)c1ccc(c(c1)C(F)(F)F)Cl)Cc1c[nH]c2c1cccc2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  TQQ:
    id: TQQ
    name: (s)-2-amino-3-(6,7-dihydro-6-imino-7-oxo-1h-indol-3-yl)propanoic acid
    synonyms:
    - 3-[(6Z)-6-imino-7-oxo-6,7-dihydro-1H-indol-3-yl]-L-alanine
    - (2S)-2-amino-3-(6-imino-7-oxo-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: TQQ
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1C=CC(=N)C2=O)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 19
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    - molecule: Monomer
      element: H
      position: 19
      charge: 1
  TQZ:
    id: TQZ
    name: 2-amino-3-pentasulfanylpropan-1-ol
    synonyms:
    - 3-pentasulfanyl-L-alanine
    - (2R)-2-azanyl-3-(pentasulfanyl)propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: TQZ
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSSSS'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TRF:
    id: TRF
    name: n1-formyl-tryptophan
    synonyms:
    - (2S)-2-amino-3-(1-methanoylindol-3-yl)propanoic acid
    - 1-formyl-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: TRF
    structure: O=Cn1cc(c2c1cccc2)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TRN:
    id: TRN
    name: nz2-tryptophan
    synonyms:
    - (2S)-2-amino-3-(1H-pyrrolo[5,4-b]pyridin-3-yl)propanoic acid
    - 3-(1H-pyrrolo[2,3-b]pyridin-3-yl)-L-alanine
    - W
    identifiers:
    - ns: pdb-ccd
      id: TRN
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1cccn2'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TRW:
    id: TRW
    name: trw3-(2-amino-3-hydroxy-propyl)-6-(n'-cyclohexyl-hydrazino)octahydro-indol-7-ol
    synonyms:
    - (2S)-2-amino-3-[7-hydroxy-6-(2-phenylhydrazinyl)-1H-indol-3-yl]propanal
    - (2S)-2-amino-3-[7-hydroxy-6-(2-phenylhydrazino)-1H-indol-3-yl]propanal
    - W
    identifiers:
    - ns: pdb-ccd
      id: TRW
    structure: '[NH3+][C@H](C(=O)[O-])Cc1c[nH]c2c1ccc(c2O)NNc1ccccc1'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TRX:
    id: TRX
    name: 6-hydroxytryptophan
    synonyms:
    - (2S)-2-azanyl-3-(6-oxidanyl-1H-indol-3-yl)propanoic acid
    - 6-hydroxy-L-tryptophan
    - W
    identifiers:
    - ns: pdb-ccd
      id: TRX
    structure: '[O-]C(=O)[C@H](Cc1c[nH]c2c1ccc(c2)O)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TRY:
    id: TRY
    name: (2z)-2-amino-3-(1h-indol-3-yl)prop-2-enoic acid
    synonyms:
    - (2Z)-2-amino-3-(1H-indol-3-yl)prop-2-enoic acid
    - (Z)-2-azanyl-3-(1H-indol-3-yl)prop-2-enoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: TRY
    structure: '[O-]C(=O)/C(=C/c1c[nH]c2c1cccc2)/[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  TST:
    id: TST
    name: 4-methyl-2-{[4-(toluene-4-sulfonyl)-thiomorpholine-3-carbonyl]-amino}-pentanoic
      acid
    synonyms:
    - N-({(3R)-4-[(4-methylphenyl)sulfonyl]thiomorpholin-3-yl}carbonyl)-L-leucine
    - X
    - (2S)-4-methyl-2-[[(3R)-4-(4-methylphenyl)sulfonylthiomorpholin-3-yl]carbonylamino]pentanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: TST
    structure: CC(C[C@@H](C(=O)[O-])NC(=O)[C@@H]1CSCCN1S(=O)(=O)c1ccc(cc1)C)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
  TSY:
    id: TSY
    name: (2s)-2-amino-3-trisulfanylpropanoic acid
    synonyms:
    - (2R)-2-azanyl-3-(trisulfanyl)propanoic acid
    - 3-trisulfanyl-L-alanine
    - C
    identifiers:
    - ns: pdb-ccd
      id: TSY
    structure: '[O-]C(=O)[C@@H]([NH3+])CSSS'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TTQ:
    id: TTQ
    name: 6-amino-7-hydroxy-l-tryptophan
    synonyms:
    - 6-amino-7-hydroxy-L-tryptophan
    - (2S)-2-amino-3-(6-amino-7-hydroxy-1H-indol-3-yl)propanoic acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: TTQ
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1c[nH]c2c1ccc(c2O)N'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TTS:
    id: TTS
    name: 3-((3e)-4-hydroxy-3-{[2-(4-hydroxyphenyl)ethyl]imino}-6-oxocyclohexa-1,4-dien-1-yl)alanine
    synonyms:
    - (2S)-2-amino-3-[(3E)-4-hydroxy-3-[2-(4-hydroxyphenyl)ethylimino]-6-oxo-1-cyclohexa-1,4-dienyl]propanoic
      acid
    - 3-[(3E)-4-hydroxy-3-{[2-(4-hydroxyphenyl)ethyl]imino}-6-oxocyclohexa-1,4-dien-1-yl]-L-alanine
    - Y
    identifiers:
    - ns: pdb-ccd
      id: TTS
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N\CCc2ccc(cc2)O)/C(=CC1=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TXY:
    id: TXY
    name: 3-[(5s)-4,5-dihydroxycyclohexa-1,3-dien-1-yl]-l-alanine
    synonyms:
    - 3-[(5S)-4,5-dihydroxycyclohexa-1,3-dien-1-yl]-L-alanine
    - (2S)-2-azanyl-3-[(5S)-4,5-bis(oxidanyl)cyclohexa-1,3-dien-1-yl]propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: TXY
    structure: '[O-]C(=O)[C@@H]([NH3+])CC1=CC=C([C@H](C1)O)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TY1:
    id: TY1
    name: o-tert-butyl-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[4-[(2-methylpropan-2-yl)oxy]phenyl]propanoic acid
    - Y
    - O-tert-butyl-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: TY1
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)OC(C)(C)C'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TY5:
    id: TY5
    name: o-benzyl-l-tyrosine
    synonyms:
    - O-benzyl-L-tyrosine
    - Y
    - (2S)-2-azanyl-3-(4-phenylmethoxyphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TY5
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)OCc1ccccc1'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TY8:
    id: TY8
    name: 2,4-bis(hydroperoxy)-5-hydroxy-l-phenylalanine
    synonyms:
    - 2,4-bis(hydroperoxy)-5-hydroxy-L-phenylalanine
    - (2S)-2-azanyl-3-(2,4-dihydroperoxy-5-hydroxy-phenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TY8
    structure: OOc1cc(OO)c(cc1C[C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  TY9:
    id: TY9
    name: 3,4-bis(hydroperoxy)-5-hydroxy-l-phenylalanine
    synonyms:
    - 3,4-bis(hydroperoxy)-5-hydroxy-L-phenylalanine
    - (2S)-2-azanyl-3-(3,4-dihydroperoxy-5-hydroxy-phenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TY9
    structure: OOc1c(O)cc(cc1OO)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TYB:
    id: TYB
    name: tyrosinal
    synonyms:
    - Y
    - (2S)-2-amino-3-(4-hydroxyphenyl)propanal
    identifiers:
    - ns: pdb-ccd
      id: TYB
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TYE:
    id: TYE
    name: 4-[(2s)-2-amino-3-hydroxypropyl]phenol
    synonyms:
    - 4-[(2S)-2-amino-3-hydroxypropyl]phenol
    - 4-[(2S)-2-azanyl-3-hydroxy-propyl]phenol
    identifiers:
    - ns: pdb-ccd
      id: TYE
    structure: OC[C@H](Cc1ccc(cc1)O)[NH3+]
    base_monomers:
    - Y
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  TYJ:
    id: TYJ
    name: 2,5-dihydroxy-n-methyl-l-tyrosine
    synonyms:
    - 2,5-dihydroxy-N-methyl-L-tyrosine
    - Y
    - (2S)-2-(methylamino)-3-(2,4,5-trihydroxyphenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: TYJ
    structure: '[O-]C(=O)[C@@H]([NH2+]C)Cc1cc(O)c(cc1O)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TYN:
    id: TYN
    name: aminobenzofurazan-o-tyrosine
    synonyms:
    - (2S)-2-amino-3-[4-[(7-amino-1,3-dihydro-2,1,3-benzoxadiazol-4-yl)oxy]phenyl]propanoic
      acid
    - Y
    - O-(7-amino-1,3-dihydro-2,1,3-benzoxadiazol-4-yl)-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: TYN
    structure: '[O-]C(=O)[C@H](Cc1ccc(cc1)Oc1ccc(c2c1NON2)N)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 24
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    - molecule: Monomer
      element: H
      position: 24
      charge: 1
  TYO:
    id: TYO
    name: (4z,6e)-2-amino-7-hydroperoxy-4-[(e)-2-hydroxyvinyl]hepta-4,6-dienoic acid
    synonyms:
    - (2S,4Z,6E)-2-amino-7-hydroperoxy-4-[(E)-2-hydroxyethenyl]hepta-4,6-dienoic acid
    - Y
    - (2S,6E)-2-amino-7-hydroperoxy-4-(2-hydroxyethenyl)hepta-4,6-dienoic acid
    identifiers:
    - ns: pdb-ccd
      id: TYO
    structure: OC=CC(=C/C=C/OO)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  TYQ:
    id: TYQ
    name: 3-amino-6-hydroxy-tyrosine
    synonyms:
    - 3-amino-6-hydroxy-L-tyrosine
    - (2S)-2-amino-3-(5-amino-2,4-dihydroxy-phenyl)propanoic acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: TYQ
    structure: '[O-]C(=O)[C@@H]([NH3+])Cc1cc(N)c(cc1O)O'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  TYT:
    id: TYT
    name: tyrosine derivative
    synonyms:
    - (2S)-2-amino-3-[(5E)-4-hydroxy-2-oxo-5-(2-phenylcyclopropyl)imino-1-cyclohex-3-enyl]propanoic
      acid
    - 3-{(5E)-4-hydroxy-2-oxo-5-[(2-phenylcyclopropyl)imino]cyclohex-3-en-1-yl}alanine
    - Y
    identifiers:
    - ns: pdb-ccd
      id: TYT
    structure: '[O-]C(=O)[C@H](CC1C/C(=N\C2CC2c2ccccc2)/C(=CC1=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  TYX:
    id: TYX
    name: s-(2-anilino-2-oxoethyl)-l-cysteine
    synonyms:
    - S-[2-oxo-2-(phenylamino)ethyl]-L-cysteine
    - (2R)-2-amino-3-(2-oxo-2-phenylazanyl-ethyl)sulfanyl-propanoic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: TYX
    structure: '[NH3+][C@H](C(=O)[O-])CSCC(=O)Nc1ccccc1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  TYY:
    id: TYY
    name: 3-(4-hydroxy-3-imino-6-oxo-cyclohexa-1,4-dienyl)-alanine
    synonyms:
    - (2S)-2-amino-3-(4-hydroxy-3-imino-6-oxo-1-cyclohexa-1,4-dienyl)propanoic acid
    - Y
    - 3-[(3Z)-4-hydroxy-3-imino-6-oxocyclohexa-1,4-dien-1-yl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: TYY
    structure: '[O-]C(=O)[C@H](CC1=CC(=[NH2+])C(=CC1=O)[O-])[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  TZB:
    id: TZB
    name: (4s)-2-[(1e)-1-aminoprop-1-enyl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    synonyms:
    - (4S)-2-[(1Z)-1-aminoprop-1-en-1-yl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    - (4S)-2-[(Z)-1-aminoprop-1-enyl]-4,5-dihydro-1,3-thiazole-4-carboxylic acid
    - X
    identifiers:
    - ns: pdb-ccd
      id: TZB
    structure: '[O-]C(=O)[C@H]1CSC(=N1)/C(=C/C)/N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  U2X:
    id: U2X
    name: o-(cyclohexylmethyl)-l-tyrosine
    synonyms:
    - (2S)-2-azanyl-3-[4-(cyclohexylmethoxy)phenyl]propanoic acid
    - O-(cyclohexylmethyl)-L-tyrosine
    identifiers:
    - ns: pdb-ccd
      id: U2X
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)OCC1CCCCC1'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  U3X:
    id: U3X
    name: 4-[(cyclohexylmethyl)amino]-l-phenylalanine
    synonyms:
    - 4-[(cyclohexylmethyl)amino]-L-phenylalanine
    - (2S)-2-azanyl-3-[4-(cyclohexylmethylamino)phenyl]propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: U3X
    structure: '[NH3+][C@H](C(=O)[O-])Cc1ccc(cc1)NCC1CCCCC1'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  UF0:
    id: UF0
    name: o-[(r)-hydroxy{[(3r)-3-hydroxy-4-{[3-({2-[(hydroxyacetyl)amino]ethyl}amino)-3-oxopropyl]amino}-2,2-dimethyl-4-oxobutyl]oxy}phosphoryl]-l-serine
    synonyms:
    - (2S)-2-azanyl-3-[hydroxy-[(3R)-3-hydroxy-4-[[3-[2-(2-hydroxyethanoylamino)ethylamino]-3-oxo-propyl]amino]-2,2-dimethyl-4-oxo-butoxy]phosphoryl]oxy-propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: UF0
    structure: OCC(=O)NCCNC(=O)CCNC(=O)[C@@H](C(COP(=O)(OC[C@@H](C(=O)[O-])[NH3+])[O-])(C)C)O
    base_monomers:
    - S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 30
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 30
    - molecule: Monomer
      element: H
      position: 30
      charge: 1
  UM2:
    id: UM2
    name: (2s)-2-amino-n-butyl-propanamide
    synonyms:
    - (2S)-2-amino-N-butyl-propanamide
    - N-butyl-L-alaninamide
    identifiers:
    - ns: pdb-ccd
      id: UM2
    structure: CCCCNC(=O)[C@@H]([NH3+])C
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
  UMA:
    id: UMA
    name: uridine-5'-diphosphate-n-acetylmuramoyl-l-alanine
    synonyms:
    - A
    - (2S)-2-[[(2R)-2-[(2R,3R,4R,5S,6R)-3-acetamido-2-[[[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-4-yl]oxypropanoyl]amino]propanoic
      acid
    - (2S)-2-{[(2R)-2-{[(2R,3R,4R,5S,6R)-3-(acetylamino)-2-{[(R)-{[(R)-{[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}(hydroxy)phosphoryl]oxy}-5-hydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-4-yl]oxy}propanoyl]amino}propanoic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: UMA
    structure: OC[C@H]1O[C@H](O[P@](=O)(O[P@@](=O)(OC[C@H]2O[C@H]([C@@H]([C@@H]2O)O)n2ccc(=O)[nH]c2=O)[O-])[O-])[C@@H]([C@H]([C@@H]1O)O[C@@H](C(=O)N[C@H](C(=O)[O-])C)C)NC(=O)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 53
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 50
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 55
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 50
  UN2:
    id: UN2
    name: 2-amino-4,4-dihydroxybutanoic acid
    synonyms:
    - (2S)-2-amino-4,4-dihydroxy-butanoic acid
    - 4-hydroxy-L-homoserine
    - X
    identifiers:
    - ns: pdb-ccd
      id: UN2
    structure: '[NH3+][C@H](C(=O)[O-])CC(O)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  UNK:
    id: UNK
    name: unknown
    synonyms:
    - X
    - (2S)-2-aminobutanoic acid
    identifiers:
    - ns: pdb-ccd
      id: UNK
    structure: '[O-]C(=O)[C@@H]([NH3+])CC'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  UOX:
    id: UOX
    name: 3-(oxido-lambda~4~-selanyl)-l-alanine
    synonyms:
    - U
    - 3-(oxido-lambda~4~-selanyl)-L-alanine
    - (2R)-2-azanyl-3-hydroseleninyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: UOX
    structure: O=[Se-]C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - SEC
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  UU4:
    id: UU4
    name: (2s)-2-amino-4-(l-serylamino)butanoic acid
    synonyms:
    - (2S)-2-azanyl-4-[[(2S)-2-azanyl-3-oxidanyl-propanoyl]amino]butanoic acid
    - (2S)-2-amino-4-(L-serylamino)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: UU4
    structure: OC[C@@H](C(=O)NCC[C@@H](C(=O)[O-])[NH3+])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  UU5:
    id: UU5
    name: (2s)-2-amino-4-[(oxoacetyl)amino]butanoic acid
    synonyms:
    - (2S)-2-azanyl-4-(oxaldehydoylamino)butanoic acid
    - (2S)-2-amino-4-[(oxoacetyl)amino]butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: UU5
    structure: O=CC(=O)NCC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
    - molecule: Monomer
      element: H
      position: 13
      charge: 1
  VAD:
    id: VAD
    name: deaminohydroxyvaline
    synonyms:
    - V
    - (2R)-2-hydroxy-3-methylbutanoic acid
    - (2R)-2-hydroxy-3-methyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: VAD
    structure: O[C@@H](C(=O)[O-])C(C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 6
      charge: -1
  VAH:
    id: VAH
    name: (3r)-3-hydroxy-l-norvaline
    synonyms:
    - (2S,3R)-2-azanyl-3-hydroxy-pentanoic acid
    - (3R)-3-hydroxy-L-norvaline
    identifiers:
    - ns: pdb-ccd
      id: VAH
    structure: CC[C@H]([C@@H](C(=O)[O-])[NH3+])O
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  VB1:
    id: VB1
    name: n^6^-[(1r)-2-{[(1s)-1-carboxypropyl]amino}-2-oxo-1-(sulfanylmethyl)ethyl]-6-oxo-l-lysine
    synonyms:
    - (2S)-2-amino-6-[[(2R)-1-[[(2S)-1-hydroxy-1-oxo-butan-2-yl]amino]-1-oxo-3-sulfanyl-propan-2-yl]amino]-6-oxo-hexanoic
      acid
    - K
    - N~6~-[(1R)-2-{[(1S)-1-carboxypropyl]amino}-2-oxo-1-(sulfanylmethyl)ethyl]-6-oxo-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: VB1
    structure: SC[C@@H](C(=O)N[C@H](C(=O)[O-])CC)NC(=O)CCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 12
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  VH0:
    id: VH0
    name: (2s,4s)-4-[4-(aminomethyl)-1,2,3-triazol-1-yl]pyrrolidine-2-carboxylic acid
    synonyms:
    - (4S)-4-[4-(aminomethyl)-1H-1,2,3-triazol-1-yl]-L-proline
    - (2S,4S)-4-[4-(aminomethyl)-1,2,3-triazol-1-yl]pyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: VH0
    structure: '[NH3+]Cc1nnn(c1)[C@@H]1C[NH2+][C@@H](C1)C(=O)[O-]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  VLL:
    id: VLL
    name: (2s)-2,3-diaminobutanoic acid
    synonyms:
    - (2S,3R)-2,3-diaminobutanoic acid
    - X
    - (2S,3R)-2,3-bis(azanyl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: VLL
    structure: '[O-]C(=O)[C@H]([C@H]([NH3+])C)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  VMS:
    id: VMS
    name: 5'o-[n-(l-valyl)sulphamoyl]adenosine
    synonyms:
    - 5'-O-(L-valylsulfamoyl)adenosine
    - X
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl N-[(2S)-2-amino-3-methyl-butanoyl]sulfamate'
    identifiers:
    - ns: pdb-ccd
      id: VMS
    structure: CC([C@@H](C(=O)[N-]S(=O)(=O)OC[C@H]1O[C@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)N)C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 26
  VOL:
    id: VOL
    name: l-valinol
    synonyms:
    - (2S)-2-amino-3-methylbutan-1-ol
    - X
    - (2S)-2-amino-3-methyl-butan-1-ol
    identifiers:
    - ns: pdb-ccd
      id: VOL
    structure: OC[C@H](C(C)C)[NH3+]
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
    - molecule: Monomer
      element: H
      position: 8
      charge: 1
  VR0:
    id: VR0
    name: n~5~-[n-(methylcarbamoyl)carbamimidoyl]-l-ornithine
    synonyms:
    - N~5~-[N-(methylcarbamoyl)carbamimidoyl]-L-ornithine
    - (2S)-2-azanyl-5-[[N-(methylcarbamoyl)carbamimidoyl]amino]pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: VR0
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCNC(=[NH2+])NC(=O)NC'
    base_monomers:
    - R
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  VYA:
    id: VYA
    name: 2-[(4~{z})-2-[(1~{s})-1-azanyl-3-methyl-butyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    synonyms:
    - 2-[(4~{Z})-2-[(1~{S})-1-azanyl-3-methyl-butyl]-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - LYG
    identifiers:
    - ns: pdb-ccd
      id: VYA
    structure: '[NH3+][C@H](C1=N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-])CC(C)C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  WCR:
    id: WCR
    name: '[(2r,4z)-2-(aminomethyl)-2-hydroxy-4-(4-hydroxybenzylidene)-5-oxoimidazolidin-1-yl]acetic
      acid'
    synonyms:
    - GYG
    - 2-[(2R,4Z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-2-oxidanyl-5-oxidanylidene-imidazolidin-1-yl]ethanoic
      acid
    - '[(2R,4Z)-2-(aminomethyl)-2-hydroxy-4-(4-hydroxybenzylidene)-5-oxoimidazolidin-1-yl]acetic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: WCR
    structure: '[NH3+]C[C@@]1(O)N/C(=C\c2ccc(cc2)O)/C(=O)N1CC(=O)[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  WFP:
    id: WFP
    name: 3,5-difluoro-l-phenylalanine
    synonyms:
    - (2S)-2-azanyl-3-(3,5-difluorophenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: WFP
    structure: '[NH3+][C@H](C(=O)[O-])Cc1cc(F)cc(c1)F'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  WLU:
    id: WLU
    name: (4r)-5-hydroxy-n-methyl-l-leucine
    synonyms:
    - (2S,4R)-4-methyl-2-(methylamino)-5-oxidanyl-pentanoic acid
    - (4R)-5-hydroxy-N-methyl-L-leucine
    - L
    identifiers:
    - ns: pdb-ccd
      id: WLU
    structure: C[NH2+][C@H](C(=O)[O-])C[C@H](CO)C
    base_monomers:
    - L
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  WPA:
    id: WPA
    name: (betar)-beta-methoxy-l-phenylalanine
    synonyms:
    - F
    - (2S,3R)-2-azanyl-3-methoxy-3-phenyl-propanoic acid
    - (betaR)-beta-methoxy-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: WPA
    structure: CO[C@@H]([C@@H](C(=O)[O-])[NH3+])c1ccccc1
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  WRP:
    id: WRP
    name: (betar)-beta-hydroxy-1-[(3r)-3-hydroxy-2-methylbutan-2-yl]-l-tryptophan
    synonyms:
    - (betaR)-beta-hydroxy-1-[(3R)-3-hydroxy-2-methylbutan-2-yl]-L-tryptophan
    - (2S,3R)-2-azanyl-3-[1-[(3R)-2-methyl-3-oxidanyl-butan-2-yl]indol-3-yl]-3-oxidanyl-propanoic
      acid
    - W
    identifiers:
    - ns: pdb-ccd
      id: WRP
    structure: '[O-]C(=O)[C@H]([C@@H](c1cn(c2c1cccc2)C([C@H](O)C)(C)C)O)[NH3+]'
    base_monomers:
    - W
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 25
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    - molecule: Monomer
      element: H
      position: 25
      charge: 1
  WVL:
    id: WVL
    name: (2s,3r)-2-amino-3,5-dimethylhex-4-enoic acid
    synonyms:
    - V
    - (2S,3R)-2-azanyl-3,5-dimethyl-hex-4-enoic acid
    - (2S,3R)-2-amino-3,5-dimethylhex-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: WVL
    structure: CC(=C[C@H]([C@@H](C(=O)[O-])[NH3+])C)C
    base_monomers:
    - V
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 8
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  X2W:
    id: X2W
    name: n-acetyl-l-glutamyl 5-phosphate
    synonyms:
    - E
    - N-acetyl-5-oxo-5-(phosphonooxy)-L-norvaline
    - (2S)-2-acetamido-5-oxo-5-phosphonooxy-pentanoic acid
    identifiers:
    - ns: pdb-ccd
      id: X2W
    structure: CC(=O)N[C@H](C(=O)[O-])CCC(=O)OP(=O)([O-])[O-]
    base_monomers:
    - E
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
  X9Q:
    id: X9Q
    name: '{(2s)-2-[(1s)-1-aminoethyl]-4-benzyl-5-oxo-2,5-dihydro-1h-imidazol-1-yl}acetic
      acid'
    synonyms:
    - '{(2S)-2-[(1S)-1-aminoethyl]-4-benzyl-5-oxo-2,5-dihydro-1H-imidazol-1-yl}acetic
      acid'
    - 2-[2-[(1S)-1-aminoethyl]-5-oxo-4-(phenylmethyl)-2H-imidazol-1-yl]ethanoic acid
    - AFG
    identifiers:
    - ns: pdb-ccd
      id: X9Q
    structure: C[C@@H](C1N=C(C(=O)N1CC(=O)[O-])Cc1ccccc1)[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 5
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 13
      charge: -1
  XOK:
    id: XOK
    name: (2~{s})-2-azanyl-6-[[(6~{s})-6-sulfanyloctanoyl]amino]hexanoic acid
    synonyms:
    - (2~{S})-2-azanyl-6-[[(6~{S})-6-sulfanyloctanoyl]amino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: XOK
    structure: CC[C@@H](CCCCC(=O)NCCCC[C@@H](C(=O)[O-])[NH3+])S
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  XPL:
    id: XPL
    name: n~6~-[(3r,5r)-5-amino-3-methyl-d-prolyl]-l-lysine
    synonyms:
    - (2S)-2-azanyl-6-[[(2R,3R,5R)-5-azanyl-3-methyl-pyrrolidin-2-yl]carbonylamino]hexanoic
      acid
    - N~6~-[(3R,5R)-5-amino-3-methyl-D-prolyl]-L-lysine
    - O
    identifiers:
    - ns: pdb-ccd
      id: XPL
    structure: '[O-]C(=O)[C@@H]([NH3+])CCCCNC(=O)[C@@H]1N[C@H](C[C@H]1C)[NH3+]'
    base_monomers:
    - PYL
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  XPR:
    id: XPR
    name: (2s,3as,6r,7as)-6-(sulfooxy)octahydro-1h-indole-2-carboxylic acid
    synonyms:
    - P
    - (2S,3aS,6R,7aS)-6-sulfooxy-2,3,3a,4,5,6,7,7a-octahydro-1H-indole-2-carboxylic
      acid
    - (2S,3aS,6R,7aS)-6-(sulfooxy)octahydro-1H-indole-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: XPR
    structure: '[O-]C(=O)[C@@H]1C[C@H]2[C@@H]([NH2+]1)C[C@@H](CC2)OS(=O)(=O)[O-]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 11
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    - molecule: Monomer
      element: H
      position: 11
      charge: 1
  XW1:
    id: XW1
    name: (2s)-2-amino-7-ethoxy-7-oxoheptanoic acid
    synonyms:
    - (2S)-2-azanyl-7-ethoxy-7-oxidanylidene-heptanoic acid
    - (2S)-2-amino-7-ethoxy-7-oxoheptanoic acid
    identifiers:
    - ns: pdb-ccd
      id: XW1
    structure: CCOC(=O)CCCC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  XX1:
    id: XX1
    name: n~6~-7h-purin-6-yl-l-lysine
    synonyms:
    - K
    - N~6~-7H-purin-6-yl-L-lysine
    - (2S)-2-amino-6-(7H-purin-6-ylamino)hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: XX1
    structure: '[O-]C(=O)[C@H](CCCCNc1ncnc2c1[nH]cn2)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 21
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    - molecule: Monomer
      element: H
      position: 21
      charge: 1
  XXA:
    id: XXA
    name: 2,4,5-trideoxy-2-(methylamino)-4-[(2e)-penta-2,4-dien-1-yl]-l-xylonic acid
    synonyms:
    - (2S,3R,4R,6E)-3-hydroxy-4-methyl-2-(methylamino)nona-6,8-dienoic acid
    - 2,4,5-trideoxy-2-(methylamino)-4-[(2E)-penta-2,4-dien-1-yl]-L-xylonic acid
    identifiers:
    - ns: pdb-ccd
      id: XXA
    structure: '[O-]C(=O)[C@@H]([NH2+]C)[C@@H]([C@@H](C/C=C/C=C)C)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  XXY:
    id: XXY
    name: 2-[(1r,2r)-1-amino-2-hydroxypropyl]-1-(carboxymethyl)-4-(1h-imidazol-5-ylmethyl)-1h-imidazol-5-olate
    synonyms:
    - 2-[(1R,2R)-1-amino-2-hydroxypropyl]-1-(carboxymethyl)-4-(1H-imidazol-5-ylmethyl)-1H-imidazol-5-olate
    - 2-[(1R,2R)-1-amino-2-hydroxy-propyl]-3-(carboxymethyl)-5-(3H-imidazol-4-ylmethyl)imidazol-4-olate
    - THG
    identifiers:
    - ns: pdb-ccd
      id: XXY
    structure: '[O-]C(=O)Cn1c(O)c(nc1[C@H]([C@H](O)C)[NH3+])Cc1cnc[nH]1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  XYC:
    id: XYC
    name: (2~{s})-2-azanyl-3-cyclopentyl-propanoic acid
    synonyms:
    - (2~{S})-2-azanyl-3-cyclopentyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: XYC
    structure: '[NH3+][C@H](C(=O)[O-])CC1CCCC1'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  YCM:
    id: YCM
    name: s-(2-amino-2-oxoethyl)-l-cysteine
    synonyms:
    - S-(2-amino-2-oxoethyl)-L-cysteine
    - (2R)-2-amino-3-(2-amino-2-oxo-ethyl)sulfanyl-propanoic acid
    - C
    identifiers:
    - ns: pdb-ccd
      id: YCM
    structure: NC(=O)CSC[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  YCP:
    id: YCP
    name: (2s)-piperidine-2-carboxylic acid
    synonyms:
    - (2S)-piperidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: YCP
    structure: '[O-]C(=O)[C@@H]1CCCC[NH2+]1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  YOF:
    id: YOF
    name: 3-fluorotyrosine
    synonyms:
    - 3-fluoro-L-tyrosine
    - Y
    - (2S)-2-amino-3-(3-fluoro-4-hydroxy-phenyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: YOF
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)F)O)[NH3+]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  YPR:
    id: YPR
    name: (4r)-4-[(7-methoxy-2-phenylquinolin-4-yl)oxy]-l-proline
    synonyms:
    - (4R)-4-[(7-methoxy-2-phenylquinolin-4-yl)oxy]-L-proline
    - (2S,4R)-4-(7-methoxy-2-phenyl-quinolin-4-yl)oxypyrrolidine-2-carboxylic acid
    identifiers:
    - ns: pdb-ccd
      id: YPR
    structure: COc1ccc2c(c1)nc(cc2O[C@H]1C[NH2+][C@@H](C1)C(=O)[O-])c1ccccc1
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 17
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    - molecule: Monomer
      element: H
      position: 17
      charge: 1
  YPZ:
    id: YPZ
    name: 3-[(3z)-4-hydroxy-6-oxo-3-(2-phenylhydrazinylidene)cyclohexa-1,4-dien-1-yl]-l-alanine
    synonyms:
    - (2S)-2-azanyl-3-[(3Z)-4-oxidanyl-6-oxidanylidene-3-(phenylhydrazinylidene)cyclohexa-1,4-dien-1-yl]propanoic
      acid
    - 3-[(3Z)-4-hydroxy-6-oxo-3-(2-phenylhydrazinylidene)cyclohexa-1,4-dien-1-yl]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: YPZ
    structure: '[NH3+][C@H](C(=O)[O-])CC1=C/C(=N/Nc2ccccc2)/C(=CC1=O)[O-]'
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  YTH:
    id: YTH
    name: o-phosphono-l-allothreonine
    synonyms:
    - (2S,3S)-2-azanyl-3-phosphonooxy-butanoic acid
    - O-phosphono-L-allothreonine
    - T
    identifiers:
    - ns: pdb-ccd
      id: YTH
    structure: '[O-]C(=O)[C@H]([C@@H](OP(=O)([O-])[O-])C)[NH3+]'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  YYA:
    id: YYA
    name: 2,4,5-trideoxy-2-(methylamino)-4-[(2z)-penta-2,4-dien-1-yl]-l-xylonic acid
    synonyms:
    - (2S,3R,4R,6Z)-3-hydroxy-4-methyl-2-(methylamino)nona-6,8-dienoic acid
    - 2,4,5-trideoxy-2-(methylamino)-4-[(2Z)-penta-2,4-dien-1-yl]-L-xylonic acid
    identifiers:
    - ns: pdb-ccd
      id: YYA
    structure: '[O-]C(=O)[C@@H]([NH2+]C)[C@@H]([C@@H](C/C=C\C=C)C)O'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  Z01:
    id: Z01
    name: 3-[(2,2-dimethylpropanoyl)amino]-l-alanine
    synonyms:
    - A
    - (2S)-2-azanyl-3-(2,2-dimethylpropanoylamino)propanoic acid
    - 3-[(2,2-dimethylpropanoyl)amino]-L-alanine
    identifiers:
    - ns: pdb-ccd
      id: Z01
    structure: '[NH3+][C@H](C(=O)[O-])CNC(=O)C(C)(C)C'
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  Z3E:
    id: Z3E
    name: o-benzyl-l-threonine
    synonyms:
    - O-benzyl-L-threonine
    - (2S,3R)-2-azanyl-3-phenylmethoxy-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: Z3E
    structure: C[C@H]([C@@H](C(=O)[O-])[NH3+])OCc1ccccc1
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  Z70:
    id: Z70
    name: (2s)-2-amino-4-(2-amino-1h-imidazol-5-yl)butanoic acid
    synonyms:
    - (2S)-2-amino-4-(2-amino-1H-imidazol-5-yl)butanoic acid
    - (2S)-2-azanyl-4-(2-azanyl-1H-imidazol-5-yl)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: Z70
    structure: '[O-]C(=O)[C@@H]([NH3+])CCc1c[nH+]c([nH]1)N'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  ZBZ:
    id: ZBZ
    name: s-(phenylcarbonyl)-l-cysteine
    synonyms:
    - S-benzoyl-L-cysteine
    - (2R)-2-azanyl-3-(phenylcarbonylsulfanyl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ZBZ
    structure: '[NH3+][C@H](C(=O)[O-])CSC(=O)c1ccccc1'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  ZCL:
    id: ZCL
    name: 3,4-dichloro-l-phenylalanine
    synonyms:
    - F
    - (2S)-2-azanyl-3-(3,4-dichlorophenyl)propanoic acid
    - 3,4-dichloro-L-phenylalanine
    identifiers:
    - ns: pdb-ccd
      id: ZCL
    structure: '[O-]C(=O)[C@H](Cc1ccc(c(c1)Cl)Cl)[NH3+]'
    base_monomers:
    - F
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
    - molecule: Monomer
      element: H
      position: 15
      charge: 1
  ZFB:
    id: ZFB
    name: (3r)-3-{[(benzyloxy)carbonyl]amino}-2-oxo-4-phenylbutane-1-diazonium
    synonyms:
    - (3R)-2-oxo-4-phenyl-3-phenylmethoxycarbonylamino-butane-1-diazonium
    - (3R)-3-{[(benzyloxy)carbonyl]amino}-2-oxo-4-phenylbutane-1-diazonium
    - X
    identifiers:
    - ns: pdb-ccd
      id: ZFB
    structure: N#[N+]CC(=O)[C@@H](Cc1ccccc1)NC(=O)OCc1ccccc1
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 15
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 15
  ZU0:
    id: ZU0
    name: o-tert-butyl-l-threonine
    synonyms:
    - O-tert-butyl-L-threonine
    - (2S,3R)-2-azanyl-3-[(2-methylpropan-2-yl)oxy]butanoic acid
    - T
    identifiers:
    - ns: pdb-ccd
      id: ZU0
    structure: C[C@H]([C@@H](C(=O)[O-])[NH3+])OC(C)(C)C
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  ZYJ:
    id: ZYJ
    name: (4r)-4-({[(1e)-(3,4-dimethoxyphenyl)methylidene]amino}oxy)-l-proline
    synonyms:
    - (2S,4R)-4-[(E)-(3,4-dimethoxyphenyl)methylideneamino]oxypyrrolidine-2-carboxylic
      acid
    - (4R)-4-({[(E)-(3,4-dimethoxyphenyl)methylidene]amino}oxy)-L-proline
    identifiers:
    - ns: pdb-ccd
      id: ZYJ
    structure: COc1cc(/C=N/O[C@H]2C[NH2+][C@@H](C2)C(=O)[O-])ccc1OC
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 12
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    - molecule: Monomer
      element: H
      position: 12
      charge: 1
  ZYK:
    id: ZYK
    name: (4r)-4-({[(3,4-dimethoxyphenyl)carbonyl]amino}oxy)-l-proline
    synonyms:
    - (2S,4R)-4-[(3,4-dimethoxyphenyl)carbonylamino]oxypyrrolidine-2-carboxylic acid
    - (4R)-4-{[(3,4-dimethoxybenzoyl)amino]oxy}-L-proline
    identifiers:
    - ns: pdb-ccd
      id: ZYK
    structure: COc1cc(ccc1OC)C(=O)NO[C@H]1C[NH2+][C@@H](C1)C(=O)[O-]
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 18
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    - molecule: Monomer
      element: H
      position: 18
      charge: 1
  ZZD:
    id: ZZD
    name: s-trityl-l-cysteine
    synonyms:
    - S-trityl-L-cysteine
    - C
    - (2R)-2-amino-3-tritylsulfanyl-propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: ZZD
    structure: '[NH3+][C@H](C(=O)[O-])CSC(c1ccccc1)(c1ccccc1)c1ccccc1'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  ZZJ:
    id: ZZJ
    name: n^2^-methyl-l-alaninamide
    synonyms:
    - A
    - N~2~-methyl-L-alaninamide
    - (2S)-2-methylaminopropanamide
    identifiers:
    - ns: pdb-ccd
      id: ZZJ
    structure: C[C@H]([NH2+]C)C(=O)N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 4
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    - molecule: Monomer
      element: H
      position: 4
      charge: 1
  ZZU:
    id: ZZU
    name: (2s,3s)-3-hydroxyarginine
    synonyms:
    - (2S,3S)-2-amino-5-carbamimidamido-3-hydroxy-pentanoic acid
    - (2S,3S)-2-amino-5-carbamimidamido-3-hydroxypentanoic acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: ZZU
    structure: O[C@H]([C@@H](C(=O)[O-])[NH3+])CCNC(=[NH2+])N
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 8
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    - molecule: Monomer
      element: H
      position: 9
      charge: 1
  T9E:
    id: T9E
    name: selenothreonine
    synonyms:
    - T
    - (2~{R},3~{R})-2-azanyl-3-selanyl-butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: T9E
    structure: '[O-]C(=O)[C@@H]([NH3+])[C@H]([SeH])C'
    base_monomers:
    - T
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  FOD:
    id: FOD
    name: (2s)-2-amino-4-[1-(trans-4-hydroxycyclohexyl)-1h-1,2,3-triazol-4-yl]butanoic
      acid
    synonyms:
    - (2~{S})-2-azanyl-4-[1-(4-oxidanylcyclohexyl)-1,2,3-triazol-4-yl]butanoic acid
    - (2S)-2-amino-4-[1-(trans-4-hydroxycyclohexyl)-1H-1,2,3-triazol-4-yl]butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: FOD
    structure: OC1CCC(CC1)n1nnc(c1)CC[C@@H](C(=O)[O-])[NH3+]
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  HOO:
    id: HOO
    name: (2~{s})-2-azanyl-3-[2,5-bis(oxidanylidene)imidazol-4-yl]propanoic acid
    synonyms:
    - (2~{S})-2-azanyl-3-[2,5-bis(oxidanylidene)imidazol-4-yl]propanoic acid
    - H
    identifiers:
    - ns: pdb-ccd
      id: HOO
    structure: '[O-]C(=O)[C@H](CC1=NC(=O)[N-]C1=O)[NH3+]'
    base_monomers:
    - H
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 14
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 14
    - molecule: Monomer
      element: H
      position: 14
      charge: 1
  F7Q:
    id: F7Q
    name: (2~{s})-2-azanyl-3-[1-(dioxidanyl)-4-oxidanylidene-cyclohexa-2,5-dien-1-yl]propanoic
      acid
    synonyms:
    - (2~{S})-2-azanyl-3-[1-(dioxidanyl)-4-oxidanylidene-cyclohexa-2,5-dien-1-yl]propanoic
      acid
    - Y
    identifiers:
    - ns: pdb-ccd
      id: F7Q
    structure: OOC1(C=CC(=O)C=C1)C[C@@H](C(=O)[O-])[NH3+]
    base_monomers:
    - Y
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 13
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 16
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    - molecule: Monomer
      element: H
      position: 16
      charge: 1
  RF9:
    id: RF9
    name: n~6~-[(1r)-1-carboxyethyl]-l-lysine
    synonyms:
    - (2~{S})-2-azanyl-6-[[(2~{R})-1-oxidanyl-1-oxidanylidene-propan-2-yl]amino]hexanoic
      acid
    - N~6~-[(1R)-1-carboxyethyl]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: RF9
    structure: '[O-]C(=O)[C@H](CCCC[NH2+][C@@H](C(=O)[O-])C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 15
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 17
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  JBY:
    id: JBY
    name: (2s)-2-{(4z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1h-imidazol-1-yl}propanoic
      acid
    synonyms:
    - (2S)-2-{(4Z)-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxo-4,5-dihydro-1H-imidazol-1-yl}propanoic
      acid
    - (2~{S})-2-[(4~{Z})-2-(aminomethyl)-4-[(4-hydroxyphenyl)methylidene]-5-oxidanylidene-imidazol-1-yl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: JBY
    structure: '[NH3+]CC1=N/C(=C\c2ccc(cc2)O)/C(=O)N1[C@H](C(=O)[O-])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  BJO:
    id: BJO
    name: (4z)-4-amino-4-{1-(carboxymethyl)-5-oxo-4-[(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]-1,5-dihydro-2h-imidazol-2-ylidene}butanoic
      acid
    synonyms:
    - (4~{Z})-4-azanyl-4-[1-(2-hydroxy-2-oxoethyl)-5-oxidanylidene-4-[(4-oxidanylidenecyclohexa-2,5-dien-1-ylidene)methyl]imidazol-2-ylidene]butanoic
      acid
    - (4Z)-4-amino-4-{1-(carboxymethyl)-5-oxo-4-[(4-oxocyclohexa-2,5-dien-1-ylidene)methyl]-1,5-dihydro-2H-imidazol-2-ylidene}butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: BJO
    structure: '[O-]C(=O)CN1C(=O)C(=N/C/1=C(\CCC(=O)[O-])/N)C=C1C=CC(=O)C=C1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 9
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  EOE:
    id: EOE
    name: beta3-proline
    synonyms:
    - 2-[(2~{S})-pyrrolidin-2-yl]ethanoic acid
    identifiers:
    - ns: pdb-ccd
      id: EOE
    structure: '[O-]C(=O)C[C@@H]1CCC[NH2+]1'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  FQA:
    id: FQA
    name: n~6~-benzyl-l-lysine
    synonyms:
    - N~6~-benzyl-L-lysine
    - (2~{S})-2-azanyl-6-[(phenylmethyl)amino]hexanoic acid
    identifiers:
    - ns: pdb-ccd
      id: FQA
    structure: '[O-]C(=O)[C@H](CCCC[NH2+]Cc1ccccc1)[NH3+]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  9KP:
    id: 9KP
    name: (e)-n~6~-[(2e)-1-carboxy-3-(2-carboxyphenyl)prop-2-en-1-ylidene]-l-lysine
    synonyms:
    - 2-[(~{E},3~{E})-3-[(5~{S})-5-azanyl-6-oxidanyl-6-oxidanylidene-hexyl]imino-4-oxidanyl-4-oxidanylidene-but-1-enyl]benzoic
      acid
    - K
    - (E)-N~6~-[(2E)-1-carboxy-3-(2-carboxyphenyl)prop-2-en-1-ylidene]-L-lysine
    identifiers:
    - ns: pdb-ccd
      id: 9KP
    structure: '[NH3+][C@H](C(=O)[O-])CCCC/[NH+]=C(/C(=O)[O-])\C=C\c1ccccc1C(=O)[O-]'
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 1
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    - molecule: Monomer
      element: H
      position: 1
      charge: 1
  GZJ:
    id: GZJ
    name: (2s)-2-(acetylamino)butanoic acid
    synonyms:
    - (2~{S})-2-acetamidobutanoic acid
    - (2S)-2-(acetylamino)butanoic acid
    identifiers:
    - ns: pdb-ccd
      id: GZJ
    structure: CC[C@@H](C(=O)[O-])NC(=O)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 7
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 8
  HJH:
    id: HJH
    name: (2~{s})-2-azanyl-3-(2-methyl-5-oxidanyl-1,2,3-triazol-4-yl)propanoic acid
    synonyms:
    - (2~{S})-2-azanyl-3-(2-methyl-5-oxidanyl-1,2,3-triazol-4-yl)propanoic acid
    identifiers:
    - ns: pdb-ccd
      id: HJH
    structure: '[O-]c1nn(nc1C[C@H]([NH3+])C(=O)[O-])C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 14
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 16
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  FHE:
    id: FHE
    name: 2-[(4~{z})-2-[(1~{r})-1-azanyl-2-oxidanylidene-propyl]-4-[[4-[(2-nitrophenyl)methoxy]phenyl]methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    synonyms:
    - 2-[(4~{Z})-2-[(1~{R})-1-azanyl-2-oxidanylidene-propyl]-4-[[4-[(2-nitrophenyl)methoxy]phenyl]methylidene]-5-oxidanylidene-imidazol-1-yl]ethanoic
      acid
    - TYG
    identifiers:
    - ns: pdb-ccd
      id: FHE
    structure: '[O-]C(=O)CN1C(=N/C(=C\c2ccc(cc2)OCc2ccccc2[N+](=O)[O-])/C1=O)[C@H](C(=O)C)N'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
  JLP:
    id: JLP
    name: (2s)-2-azanyl-6-[e-[5-(hydroxymethyl)-2-methyl-3-oxidanyl-pyridin-4-yl]methylideneamino]hexanoic
      acid
    synonyms:
    - (2~{S})-2-azanyl-6-[(~{E})-[5-(hydroxymethyl)-2-methyl-3-oxidanyl-pyridin-4-yl]methylideneamino]hexanoic
      acid
    - K
    identifiers:
    - ns: pdb-ccd
      id: JLP
    structure: OCc1cnc(c(c1/C=N/CCCC[C@@H](C(=O)[O-])[NH3+])O)C
    base_monomers:
    - K
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 20
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    - molecule: Monomer
      element: H
      position: 20
      charge: 1
  JKH:
    id: JKH
    name: 4-amino-proline
    synonyms:
    - '[(3~{S},5~{S})-5-carboxypyrrolidin-3-yl]azanium'
    - P
    identifiers:
    - ns: pdb-ccd
      id: JKH
    structure: '[O-]C(=O)[C@@H]1C[C@@H](C[NH2+]1)[NH3+]'
    base_monomers:
    - P
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 10
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    - molecule: Monomer
      element: H
      position: 10
      charge: 1
  F7P:
    id: F7P
    name: 1-[(3r)-3-hydroxy-2-methylbutan-2-yl]-l-tryptophan
    synonyms:
    - 1-[(3R)-3-hydroxy-2-methylbutan-2-yl]-L-tryptophan
    - (2~{S})-2-azanyl-3-[1-[(3~{R})-2-methyl-3-oxidanyl-butan-2-yl]indol-3-yl]propanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: F7P
    structure: '[O-]C(=O)[C@H](Cc1cn(c2c1cccc2)C([C@H](O)C)(C)C)[NH3+]'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 23
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    - molecule: Monomer
      element: H
      position: 23
      charge: 1
  F7S:
    id: F7S
    name: (4s)-5-hydroxy-n-methyl-l-leucine
    synonyms:
    - (2~{S},4~{S})-4-methyl-2-(methylamino)-5-oxidanyl-pentanoic acid
    - (4S)-5-hydroxy-N-methyl-L-leucine
    identifiers:
    - ns: pdb-ccd
      id: F7S
    structure: C[NH2+][C@H](C(=O)[O-])C[C@@H](CO)C
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 2
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 2
    - molecule: Monomer
      element: H
      position: 2
      charge: 1
  F7V:
    id: F7V
    name: (2s,4e)-2-aminohex-4-enoic acid
    synonyms:
    - (2S,4E)-2-aminohex-4-enoic acid
    - (~{E},2~{S})-2-azanylhex-4-enoic acid
    identifiers:
    - ns: pdb-ccd
      id: F7V
    structure: '[O-]C(=O)[C@@H]([NH3+])C/C=C/C'
    r_bond_atoms:
    - molecule: Monomer
      element: C
      position: 2
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 6
      charge: -1
    r_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 1
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    - molecule: Monomer
      element: H
      position: 6
      charge: 1
  SGergerOMeCys:
    id: SGergerOMeCys
    name: S-geranylgeranyl-L-cysteine methyl ester
    identifiers:
    - ns: mod
      id: MOD:01119
    structure: COC(=O)[C@H](CSC/C=C(/CC/C=C(/CC/C=C(/CCC=C(C)C)\C)\C)\C)[NH3+]
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: N
      position: 29
      charge: -1
    l_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    - molecule: Monomer
      element: H
      position: 29
      charge: 1