KarrLab/bpforms

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bpforms/alphabet/rna.yml

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id: rna
name: RNA nucleotide monophosphates
description: The canonical RNA nucleotide monophosphates, plus non-canonical RNA nucleotide
  monophosphates based on <a href="http://modomics.genesilico.pl/modifications">MODOMICS</a>
  and the <a href="https://mods.rna.albany.edu/mods/">RNA Modification Database</a>
monomers:
  01A:
    id: 01A
    name: 1,2′-O-dimethyladenosine
    comments: <p>This compound is also listed under CA registry number 59867-24-2
      as the monohydriodide salt, reflecting the form in which the first reported
      synthesis was carried out.</p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - 1,2'-O-dimethyladenosine
    - m1Am
    - œ
    identifiers:
    - ns: cas
      id: 91101-00-7
    - ns: rnamods
      id: '97'
    - ns: modomics.short_name
      id: m1Am
    - ns: modomics.new_nomenclature
      id: 01A
    structure: COC1C(O)C(OC1n1cnc2c1ncn(c2=N)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  01G:
    id: 01G
    name: 1,2′-O-dimethylguanosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - 1,2'-O-dimethylguanosine
    - m1Gm
    - ε
    identifiers:
    - ns: modomics.new_nomenclature
      id: 01G
    - ns: cas
      id: 73667-71-7
    - ns: modomics.short_name
      id: m1Gm
    - ns: rnamods
      id: '96'
    structure: COC1C(O)C(OC1n1cnc2c1nc(N)n(c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  019A:
    id: 019A
    name: 1,2′-O-dimethylinosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - m1Im
    - ξ
    - 1,2'-O-dimethylinosine
    identifiers:
    - ns: rnamods
      id: '19'
    - ns: cas
      id: 65150-69-8
    - ns: modomics.new_nomenclature
      id: 019A
    - ns: modomics.short_name
      id: m1Im
    structure: COC1C(O)C(OC1n1cnc2c1ncn(c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  1309U:
    id: 1309U
    name: 1-methyl-3-(3-amino-3-carboxypropyl)pseudouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya rRNA</li></ul></p>
    synonyms:
    - α
    - 1-methyl-3-(3-amino-3-carboxypropyl) pseudouridine
    - m1acp3Y
    identifiers:
    - ns: modomics.short_name
      id: m1acp3Y
    - ns: rnamods
      id: '86'
    - ns: cas
      id: 52777-29-4
    - ns: modomics.new_nomenclature
      id: 1309U
    structure: '[O-]C(=O)C(CCn1c(=O)c(cn(c1=O)C)C1OC(C(C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  1A:
    id: 1A
    name: 1-methyladenosine
    comments: <p>First characterized as the base and later as the monoribonucleotide.</p>
      <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya
      tRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - A
    - m1A
    - '[(2R,3S,4R,5R)-5-(6-azanylidene-1-methyl-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - '"'
    - 6-hydro-1-methyladenosine-5'-monophosphate
    - 1MA
    - 1-methyladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 1MA
    - ns: modomics.new_nomenclature
      id: 1A
    - ns: rnamods
      id: '1'
    - ns: modomics.short_name
      id: m1A
    - ns: cas
      id: 15763-06-1
    - ns: pubchem.compound
      id: '27476'
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1ncn(c2=N)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  1G:
    id: 1G
    name: 1-methylguanosine
    comments: <p>Although the report in ref does not distinguish between the two subunits
      in bacteria, contemporary knowledge shows that m1G is not in the bacterial SSU
      (see SSU database) but is in the LSU (see table in Database section on rRNA
      modification).</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2-amino-1-methyl-6-oxo-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    - K
    - m1G
    - 1MG
    - 1n-methylguanosine-5'-monophosphate
    - 1-methylguanosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 1MG
    - ns: cas
      id: 2140-65-0
    - ns: modomics.short_name
      id: m1G
    - ns: pubchem.compound
      id: '96373'
    - ns: modomics.new_nomenclature
      id: 1G
    - ns: rnamods
      id: '29'
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(N)n(c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  19A:
    id: 19A
    name: 1-methylinosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - O
    - m1I
    identifiers:
    - ns: pubchem.compound
      id: '65095'
    - ns: cas
      id: 2140-73-0
    - ns: modomics.new_nomenclature
      id: 19A
    - ns: rnamods
      id: '18'
    - ns: modomics.short_name
      id: m1I
    structure: OC1C(O)C(OC1n1cnc2c1ncn(c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  19U:
    id: 19U
    name: 1-methylpseudouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      rRNA</li></ul></p>
    synonyms:
    - m1Y
    - ']'
    identifiers:
    - ns: cas
      id: 13860-38-3
    - ns: rnamods
      id: '55'
    - ns: modomics.new_nomenclature
      id: 19U
    - ns: modomics.short_name
      id: m1Y
    structure: OC1C(O)C(OC1c1cn(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  28A:
    id: 28A
    name: 2,8-dimethyladenosine
    synonyms:
    - ±
    identifiers:
    - ns: modomics.new_nomenclature
      id: 28A
    - ns: modomics.short_name
      id: m2,8A
    structure: OC1C(O)C(OC1n1c(C)nc2c1nc(C)nc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  msms2i6A:
    id: msms2i6A
    name: 2- methylthiomethylenethio-N6-isopentenyl-adenosine
    synonyms:
    - £
    identifiers:
    - ns: modomics.short_name
      id: msms2i6A
    structure: CSCSc1nc(NCC=C(C)C)c2c(n1)n(cn2)[C@@H]1O[C@@H](C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 31
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 34
      charge: -1
  21U:
    id: 21U
    name: 2-geranylthiouridine
    synonyms:
    - Γ
    identifiers:
    - ns: modomics.new_nomenclature
      id: 21U
    - ns: modomics.short_name
      id: ges2U
    structure: C/C(=C\CSc1nc(=O)ccn1[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])/CCC=C(C)C
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  21C:
    id: 21C
    name: 2-lysidine
    comments: <p>The registry number and Chemical Abstracts Index Name listed are
      for the chloride salt. The registry number (144796-96-3) and Chemical Abstracts
      Index Name (L-Lysine, N6-(1,4-dihydro-4-imino- 1-b-D-ribofuranosyl-2-pyrimidinyl)-)
      assigned to the neutral nucleoside are less effective in retrieval of lysidine
      literature. Alternate symbols are L and acp2C. The latter symbol is not recommended
      because the notation acp has a different structural definition, and is more
      commonly used in nucleoside acp3U. The common name "lysidine" was previously
      assigned to 4,5-dihydro-2-methyl-1H-imidazole (registry number 534-26-9).</p>
      <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - '}'
    - k2C
    - lysidine
    identifiers:
    - ns: cas
      id: 116120-47-9
    - ns: modomics.new_nomenclature
      id: 21C
    - ns: modomics.short_name
      id: k2C
    - ns: rnamods
      id: '28'
    structure: '[O-]C(=O)C(CCCCNC1[NH+]=C(N)C=CN1[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  2A:
    id: 2A
    name: 2-methyladenosine
    comments: <p>Although ref reports m2A to be in a mixture of SSU and LSU subunits,
      various more recent studies have shown that m2A is not present in the bacterial
      SSU (see SSU database) but is in the LSU.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>bacteria tRNA</li><li>bacteria rRNA</li></ul></p>
    synonyms:
    - m2A
    - /
    identifiers:
    - ns: cas
      id: 16526-56-0
    - ns: modomics.short_name
      id: m2A
    - ns: modomics.new_nomenclature
      id: 2A
    - ns: rnamods
      id: '2'
    - ns: pubchem.compound
      id: '261450'
    structure: OC1C(O)C(OC1n1cnc2c1nc(C)nc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  2164A:
    id: 2164A
    name: 2-methylthio cyclic N6-threonylcarbamoyladenosine
    synonyms:
    - ÿ
    identifiers:
    - ns: modomics.short_name
      id: ms2ct6A
    - ns: modomics.new_nomenclature
      id: 2164A
    structure: CSc1nc(C2C(=O)N[C@H](C2=O)[C@H](O)C)c2c(n1)n(cn2)[C@@H]1O[C@@H](C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  2160A:
    id: 2160A
    name: 2-methylthio-N6-(cis-hydroxyisopentenyl) adenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - ≠
    - ms2io6A
    identifiers:
    - ns: cas
      id: 52049-48-6
    - ns: rnamods
      id: '9'
    - ns: modomics.short_name
      id: ms2io6A
    - ns: modomics.new_nomenclature
      id: 2160A
    structure: OC/C(=C/CNc1nc(SC)nc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])/C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  2163A:
    id: 2163A
    name: 2-methylthio-N6-hydroxynorvalylcarbamoyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - ms2hn6A
    - 2-methylthio-N6-hydroxynorvalyl carbamoyladenosine
    - ≈
    identifiers:
    - ns: modomics.short_name
      id: ms2hn6A
    - ns: cas
      id: 146426-21-3
    - ns: modomics.new_nomenclature
      id: 2163A
    - ns: rnamods
      id: '15'
    structure: CCC(C(C(=O)[O-])NC(=O)Nc1nc(SC)nc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  2161A:
    id: 2161A
    name: 2-methylthio-N6-isopentenyladenosine
    comments: <p>Subsequently and independently characterized in E. coli tRNATyr.</p>
      <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - ms2i6A
    - '*'
    identifiers:
    - ns: rnamods
      id: '7'
    - ns: modomics.short_name
      id: ms2i6A
    - ns: pubchem.compound
      id: '161337'
    - ns: cas
      id: 20859-00-1
    - ns: modomics.new_nomenclature
      id: 2161A
    structure: CSc1nc(NCC=C(C)C)c2c(n1)n(cn2)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  621A:
    id: 621A
    name: 2-methylthio-N6-methyladenosine
    comments: '<p>Structure assigment is reported as a preliminary communication,
      without details. Source of tRNA: Thermodesulfobacterium commune.</p> <p>Phylogenetic
      distribution<ul><li>bacteria tRNA</li></ul></p>'
    synonyms:
    - ms2m6A
    - ∞
    identifiers:
    - ns: modomics.new_nomenclature
      id: 621A
    - ns: modomics.short_name
      id: ms2m6A
    - ns: cas
      id: 13406-51-4
    - ns: rnamods
      id: '5'
    structure: CNc1nc(SC)nc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  2162A:
    id: 2162A
    name: 2-methylthio-N6-threonylcarbamoyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - A
    - '['
    - 12A
    - 2-methylthio-N6-threonyl carbamoyladenosine
    - ms2t6A
    - (2S,3R)-2-[[9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-2-methylsulfanyl-purin-6-yl]carbamoylamino]-3-hydroxy-butanoic
      acid
    - (2S,3R)-2-({[9-{(2R,3R,4S,5R)-3,4-dihydroxy-5-[(phosphonooxy)methyl]tetrahydrofuran-2-yl}-2-(methylsulfanyl)-9H-purin-6-yl]carbamoyl}amino)-3-hydroxybutanoic
      acid (non-preferred name)
    - 2-methylthio-n6-(aminocarbonyl-l-threonyl)-adenosine-5'-monophosphate
    identifiers:
    - ns: modomics.short_name
      id: ms2t6A
    - ns: modomics.new_nomenclature
      id: 2162A
    - ns: rnamods
      id: '12'
    - ns: pdb-ccd
      id: 12A
    - ns: cas
      id: 70333-82-3
    structure: CSc1nc(NC(=O)N[C@@H](C(=O)O)[C@@H](O)C)c2c(n1)n(cn2)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 35
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 38
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 35
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 40
      charge: -1
  20U:
    id: 20U
    name: 2-selenouridine
    synonyms:
    - ω
    identifiers:
    - ns: modomics.short_name
      id: se2U
    - ns: modomics.new_nomenclature
      id: 20U
    structure: OC1C(O)C(OC1n1ccc(=O)[nH]c1=[Se])COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  02U:
    id: 02U
    name: 2-thio-2′-O-methyluridine
    comments: <p>Preliminary communication of structural characterization and chemical
      synthesis is given in.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - ∏
    - 2-thio-2'-O-methyluridine
    - s2Um
    identifiers:
    - ns: rnamods
      id: '60'
    - ns: modomics.new_nomenclature
      id: 02U
    - ns: modomics.short_name
      id: s2Um
    - ns: cas
      id: 113886-72-9
    structure: COC1C(O)C(OC1n1ccc(=O)[nH]c1=S)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  2C:
    id: 2C
    name: 2-thiocytidine
    comments: <p>Initial structural and spectroscopic data are reported in, without
      derivation of a final structure.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>bacteria tRNA</li></ul></p>
    synonyms:
    - '%'
    - '[(2R,3S,4R,5R)-5-(4-azanyl-2-sulfanylidene-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - RSP
    - s2C
    - 4-amino-1-(5-o-phosphono-beta-d-ribofuranosyl)pyrimidine-2(1h)-thione
    identifiers:
    - ns: cas
      id: 13239-97-9
    - ns: pdb-ccd
      id: RSP
    - ns: pubchem.compound
      id: '3011746'
    - ns: modomics.new_nomenclature
      id: 2C
    - ns: rnamods
      id: '23'
    - ns: modomics.short_name
      id: s2C
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(nc1=S)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  2U:
    id: 2U
    name: 2-thiouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - '2'
    - s2U
    identifiers:
    - ns: cas
      id: 20235-78-3
    - ns: modomics.short_name
      id: s2U
    - ns: pubchem.compound
      id: '3036443'
    - ns: modomics.new_nomenclature
      id: 2U
    - ns: rnamods
      id: '57'
    structure: OC1C(O)C(OC1n1ccc(=O)[nH]c1=S)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  0A:
    id: 0A
    name: 2′-O-methyladenosine
    comments: <p>Occurrence is rare in eukaryotes. First characterized as an O-2'
      or O-3' methyl derivative, and subsequently shown to be O-2'.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya tRNA</li><li>archaea
      rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>eukarya mRNA</li><li>eukarya
      snRNA</li></ul></p>
    synonyms:
    - A
    - Am
    - 2'-o-methyladenosine 5'-(dihydrogen phosphate)
    - 2'-O-methyladenosine 5'-(dihydrogen phosphate)
    - A2M
    - '[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-3-hydroxy-4-methoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-methyladenosine
    - ':'
    identifiers:
    - ns: pdb-ccd
      id: A2M
    - ns: modomics.new_nomenclature
      id: 0A
    - ns: modomics.short_name
      id: Am
    - ns: cas
      id: 2140-79-6
    - ns: rnamods
      id: '4'
    structure: CO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  0C:
    id: 0C
    name: 2′-O-methylcytidine
    comments: <p>Cm was first characterized as an O-2' or O-3' methyl derivative,
      and subsequently shown to be O-2'.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>bacteria tRNA</li><li>eukarya tRNA</li><li>archaea rRNA</li><li>bacteria
      rRNA</li><li>eukarya rRNA</li><li>eukarya mRNA</li><li>eukarya snRNA</li></ul></p>
    synonyms:
    - o2'-methylycytidine-5'-monophosphate
    - Cm
    - OMC
    - 2'-O-methylcytidine 5'-(dihydrogen phosphate)
    - 2'-O-methylcytidine
    - C
    - B
    - '[(2R,3R,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-4-methoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: modomics.new_nomenclature
      id: 0C
    - ns: cas
      id: 2140-72-9
    - ns: pdb-ccd
      id: OMC
    - ns: modomics.short_name
      id: Cm
    - ns: pubchem.compound
      id: '150971'
    - ns: rnamods
      id: '22'
    structure: CO[C@H]1[C@H](O)[C@@H](O[C@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  0G:
    id: 0G
    name: 2′-O-methylguanosine
    comments: <p>First characterized as an O-2' or O-3' methyl derivative, and subsequently
      shown to be O-2'.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya
      rRNA</li><li>eukarya mRNA</li><li>eukarya snRNA</li></ul></p>
    synonyms:
    - G
    - o2'-methylguanosine-5'-monophosphate
    - Gm
    - 2'-O-methylguanosine
    - 2'-O-methylguanosine 5'-(dihydrogen phosphate)
    - '#'
    - OMG
    - '[(2R,3R,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3-hydroxy-4-methoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: OMG
    - ns: modomics.short_name
      id: Gm
    - ns: rnamods
      id: '32'
    - ns: modomics.new_nomenclature
      id: 0G
    - ns: pubchem.compound
      id: '188959'
    - ns: cas
      id: 2140-71-8
    structure: CO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  09A:
    id: 09A
    name: 2′-O-methylinosine
    comments: <p>More thorough characterization is reported in.</p> <p>Phylogenetic
      distribution<ul><li>eukarya rRNA</li></ul></p>
    synonyms:
    - ≤
    - 2'-O-methylinosine
    - Im
    identifiers:
    - ns: modomics.short_name
      id: Im
    - ns: cas
      id: 3881-21-8
    - ns: modomics.new_nomenclature
      id: 09A
    - ns: rnamods
      id: '81'
    structure: COC1C(O)C(OC1n1cnc2c1nc[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  09U:
    id: 09U
    name: 2′-O-methylpseudouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      tRNA</li><li>eukarya rRNA</li><li>eukarya snRNA</li></ul></p>
    synonyms:
    - Ym
    - Z
    - 2'-O-methylpseudouridine
    identifiers:
    - ns: modomics.short_name
      id: Ym
    - ns: modomics.new_nomenclature
      id: 09U
    - ns: rnamods
      id: '56'
    - ns: cas
      id: 2140-68-3
    structure: COC1C(O)C(OC1c1c[nH]c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  0U:
    id: 0U
    name: 2′-O-methyluridine
    comments: <p>First characterized as an O-2' or O-3' methyl derivative, and subsequently
      shown to be O-2'.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya
      rRNA</li><li>eukarya mRNA</li><li>eukarya snRNA</li></ul></p>
    synonyms:
    - 2'-O-methyluridine
    - '[(2R,3R,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3-hydroxy-4-methoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    - o2'-methyluridine 5'-monophosphate
    - Um
    - 2'-O-methyluridine 5'-(dihydrogen phosphate)
    - J
    - OMU
    identifiers:
    - ns: modomics.short_name
      id: Um
    - ns: modomics.new_nomenclature
      id: 0U
    - ns: cas
      id: 2140-76-3
    - ns: rnamods
      id: '53'
    - ns: pdb-ccd
      id: OMU
    structure: CO[C@H]1[C@H](O)[C@@H](O[C@H]1n1ccc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  0503U:
    id: 0503U
    name: "2′-O-methyluridine 5-oxyacetic acid methyl ester\t"
    synonyms:
    - Ͽ
    identifiers:
    - ns: modomics.short_name
      id: mcmo5Um
    - ns: modomics.new_nomenclature
      id: 0503U
    structure: COC1[C@@H](O)[C@H](O[C@H]1n1cc(OCC(=O)OC)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  00A:
    id: 00A
    name: 2′-O-ribosyladenosine (phosphate)
    comments: "<p>A nucleoside component of yeast tRNA was isolated and tentatively\
      \ characterized as 2'(3')-O-ribosyladenosine by Hall, but whether the source\
      \ material was tRNA was later concluded to be uncertain. Substitution at O-2'\
      \ vs. O-3' was not established in an early reported synthesis. A recent and\
      \ more detailed synthesis is given in. Ar registry number: 28269-89-8, Chemical\
      \ Abstracts Index Name: Adenosine, 2'-O-b-D-ribofuranosyl-.</p> <p>Phylogenetic\
      \ distribution<ul><li>eukarya tRNA</li></ul></p>"
    synonyms:
    - ^
    - V3L
    - 2'-O-(5-O-phosphono-alpha-D-ribofuranosyl)adenosine 5'-(dihydrogen phosphate)
    - Ar(p)
    - '[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-4-[(2R,3R,4S,5R)-3,4-bis(oxidanyl)-5-(phosphonooxymethyl)oxolan-2-yl]oxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-o-(5-o-phosphono-alpha-d-ribofuranosyl)adenosine 5'-(dihydrogen phosphate)
    - 2'-O-ribosyladenosine (phosphate)
    identifiers:
    - ns: cas
      id: 28050-13-7
    - ns: pdb-ccd
      id: V3L
    - ns: modomics.new_nomenclature
      id: 00A
    - ns: rnamods
      id: '16'
    - ns: modomics.short_name
      id: Ar(p)
    structure: O[C@@H]1[C@@H](O[C@H]([C@@H]1O)COP(=O)(O)O)O[C@@H]1[C@H](O)[C@@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 41
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 43
      charge: -1
  00G:
    id: 00G
    name: 2′-O-ribosylguanosine (phosphate)
    comments: "<p>This structure was initially reported in; more extensive structural\
      \ data are presented in.\r\nGr registry number: 148711-49-3, Chemical Abstracts\
      \ Index Name: Guanosine, 2'-O-b-D-ribofuranosyl-.</p> <p>Phylogenetic distribution<ul><li>eukarya\
      \ tRNA</li></ul></p>"
    synonyms:
    - 2'-O-ribosylguanosine (phosphate)
    - ℑ
    - Gr(p)
    identifiers:
    - ns: modomics.short_name
      id: Gr(p)
    - ns: pubchem.compound
      id: '131365'
    - ns: rnamods
      id: '36'
    - ns: cas
      id: 131293-20-4
    - ns: modomics.new_nomenclature
      id: 00G
    structure: Nc1[nH]c(=O)c2c(n1)n(cn2)[C@@H]1O[C@@H](C([C@@H]1O[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 38
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 41
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 38
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 44
      charge: -1
  03U:
    id: 03U
    name: 3,2′-O-dimethyluridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya mRNA</li></ul></p>
    synonyms:
    - m3Um
    - σ
    - 3,2'-O-dimethyluridine
    identifiers:
    - ns: rnamods
      id: '92'
    - ns: modomics.new_nomenclature
      id: 03U
    - ns: cas
      id: 7103-27-7
    - ns: modomics.short_name
      id: m3Um
    structure: COC1[C@@H](O)[C@H](O[C@H]1n1ccc(=O)n(c1=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  308U:
    id: 308U
    name: 3-(3-amino-3-carboxypropyl)-5,6-dihydrouridine
    synonyms:
    - Ð
    identifiers:
    - ns: modomics.short_name
      id: acp3D
    - ns: modomics.new_nomenclature
      id: 308U
    structure: '[O-]C(=O)C(CCN1C(=O)CCN(C1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  309U:
    id: 309U
    name: 3-(3-amino-3-carboxypropyl)pseudouridine
    synonyms:
    - Þ
    identifiers:
    - ns: modomics.new_nomenclature
      id: 309U
    - ns: modomics.short_name
      id: acp3Y
    structure: '[O-]C(=O)C(CCn1c(=O)[nH]cc(c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  30U:
    id: 30U
    name: 3-(3-amino-3-carboxypropyl)uridine
    comments: <p>Earlier symbols used were 4abu3U and X. Symbol X for acp3U has been
      confused in the literature with "unknown nucleoside" and its use is therefore
      discouraged.</p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li><li>archaea
      rRNA</li></ul></p>
    synonyms:
    - acp3U
    - X
    identifiers:
    - ns: modomics.short_name
      id: acp3U
    - ns: rnamods
      id: '61'
    - ns: cas
      id: 52745-94-5
    - ns: modomics.new_nomenclature
      id: 30U
    structure: '[O-]C(=O)C(CCn1c(=O)ccn(c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  3C:
    id: 3C
    name: 3-methylcytidine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li><li>eukarya
      tRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - "'"
    - m3C
    identifiers:
    - ns: rnamods
      id: '20'
    - ns: cas
      id: 2140-64-9
    - ns: pubchem.compound
      id: '159649'
    - ns: modomics.new_nomenclature
      id: 3C
    - ns: modomics.short_name
      id: m3C
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1ccc([n+](c1=O)C)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  39U:
    id: 39U
    name: 3-methylpseudouridine
    comments: <p>Preparation of m3Y was reported in as one of several products formed
      by reaction of Y with diazomethane; however, the structure assignment of the
      synthetic material was regarded as tentative.</p> <p>Phylogenetic distribution<ul><li>bacteria
      rRNA</li></ul></p>
    synonyms:
    - κ
    - m3Y
    identifiers:
    - ns: rnamods
      id: '94'
    - ns: modomics.new_nomenclature
      id: 39U
    - ns: cas
      id: 81691-06-7
    - ns: modomics.short_name
      id: m3Y
    structure: OC1C(O)C(OC1c1c[nH]c(=O)n(c1=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  3U:
    id: 3U
    name: 3-methyluridine
    comments: <p>Verification that the early report of m3U synthesis was correct was
      made much later. Although this nucleoside was reported present in both 18S and
      28S rRNA from HeLa cells, later studies showed it to be confined to the 28S
      rRNA.</p> <p>Phylogenetic distribution<ul><li>archaea rRNA</li><li>bacteria
      rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - 3-methyluridine-5'-monophoshate
    - U
    - m3U
    - 3-methyluridine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-[3-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - δ
    - UR3
    identifiers:
    - ns: pubchem.compound
      id: '316991'
    - ns: modomics.short_name
      id: m3U
    - ns: rnamods
      id: '85'
    - ns: modomics.new_nomenclature
      id: 3U
    - ns: cas
      id: 2140-69-4
    - ns: pdb-ccd
      id: UR3
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(=O)n(c1=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  4G:
    id: 4G
    name: 4-demethylwyosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Numbering is based on 1H-imidazo[1,2-a]purine.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li></ul></p>
    synonyms:
    - imG-14
    - †
    identifiers:
    - ns: modomics.new_nomenclature
      id: 4G
    - ns: rnamods
      id: '100'
    - ns: cas
      id: 59327-60-5
    - ns: modomics.short_name
      id: imG-14
    - ns: pubchem.compound
      id: '477875'
    structure: OC1C(O)C(OC1n1cnc2c1[nH]c1nc(cn1c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  74U:
    id: 74U
    name: 4-thiouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - '4'
    - U
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(2-oxo-4-sulfanylidene-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - s4U
    - 4-thiouridine-5'-monophosphate
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-4-thioxo-3,4-dihydropyrimidin-2(1H)-one
    - 4SU
    identifiers:
    - ns: pubchem.compound
      id: '3954028'
    - ns: modomics.short_name
      id: s4U
    - ns: modomics.new_nomenclature
      id: 74U
    - ns: cas
      id: 13957-31-8
    - ns: rnamods
      id: '58'
    - ns: pdb-ccd
      id: 4SU
    structure: O[C@H]1[C@H](O)[C@@H](O[C@H]1n1ccc(=S)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  05C:
    id: 05C
    name: 5,2′-O-dimethylcytidine
    comments: <p>Preliminary communication of structural characterization and chemical
      synthesis is given in.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - 5,2'-O-dimethylcytidine
    - τ
    - m5Cm
    identifiers:
    - ns: rnamods
      id: '26'
    - ns: modomics.new_nomenclature
      id: 05C
    - ns: modomics.short_name
      id: m5Cm
    - ns: cas
      id: 113886-70-7
    structure: COC1C(O)C(OC1n1cc(C)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  05U:
    id: 05U
    name: 5,2′-O-dimethyluridine
    comments: <p>Alternate symbol is Tm.</p> <p>Phylogenetic distribution<ul><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - m5Um
    - 2',5-dimethyluridine-5'-monophosphate
    - \
    - '[(2R,3R,4R,5R)-3-hydroxy-4-methoxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5,2'-O-dimethyluridine
    - 2MU
    - U
    - 5-methyl-2'-O-methyluridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 2MU
    - ns: cas
      id: 55486-09-4
    - ns: rnamods
      id: '54'
    - ns: modomics.short_name
      id: m5Um
    - ns: modomics.new_nomenclature
      id: 05U
    structure: CO[C@H]1[C@H](O)[C@@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  0522U:
    id: 0522U
    name: 5-(carboxyhydroxymethyl)-2′-O-methyluridine methyl ester
    synonyms:
    - b
    identifiers:
    - ns: modomics.short_name
      id: mchm5Um
    - ns: modomics.new_nomenclature
      id: 0522U
    structure: COC1[C@@H](O)[C@H](O[C@H]1n1cc(c(=O)[nH]c1=O)C(C(=O)OC)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  522U:
    id: 522U
    name: 5-(carboxyhydroxymethyl)uridine methyl ester
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - mchm5U
    - ','
    identifiers:
    - ns: rnamods
      id: '67'
    - ns: modomics.short_name
      id: mchm5U
    - ns: modomics.new_nomenclature
      id: 522U
    - ns: cas
      id: 89665-83-8
    structure: COC(=O)C(c1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  2583U:
    id: 2583U
    name: 5-(isopentenylaminomethyl)-2-thiouridine
    comments: '<p>Preparation of conventional manuscript is in progress. Source of
      tRNA: Thermodesulfobacterium commune. Coautors for this work: Phillips, D.R.,
      Hashizume, T., Crain, P.F., Widdel, F.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>'
    synonyms:
    - inm5s2U
    - 5-(isopentenylaminomethyl)- 2-thiouridine
    - ½
    identifiers:
    - ns: rnamods
      id: '104'
    - ns: modomics.short_name
      id: inm5s2U
    - ns: cas
      id: 872710-78-6
    - ns: modomics.new_nomenclature
      id: 2583U
    structure: CC(=CC[NH2+]Cc1cn(c(=S)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  0583U:
    id: 0583U
    name: 5-(isopentenylaminomethyl)-2′-O-methyluridine
    comments: '<p>Preparation of conventional manuscript is in progress. Source of
      tRNA: Thermodesulfobacterium commune. Coautors for this work: Phillips, D.R.,
      Hashizume, T., Crain, P.F., Widdel, F.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>'
    synonyms:
    - inm5Um
    - ¼
    - 5-(isopentenylaminomethyl)- 2'-O-methyluridine
    identifiers:
    - ns: cas
      id: 872710-80-0
    - ns: rnamods
      id: '105'
    - ns: modomics.new_nomenclature
      id: 0583U
    - ns: modomics.short_name
      id: inm5Um
    structure: COC1C(O)C(OC1n1cc(C[NH2+]CC=C(C)C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  583U:
    id: 583U
    name: 5-(isopentenylaminomethyl)uridine
    comments: '<p>Preparation of conventional manuscript is in progress. Source of
      tRNA: Thermodesulfobacterium commune. Coautors for this work: Phillips, D.R.,
      Hashizume, T., Crain, P.F., Widdel, F.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>'
    synonyms:
    - ¾
    - inm5U
    identifiers:
    - ns: modomics.new_nomenclature
      id: 583U
    - ns: modomics.short_name
      id: inm5U
    - ns: rnamods
      id: '103'
    - ns: cas
      id: 872710-76-4
    structure: CC(=CC[NH2+]Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  21510U:
    id: 21510U
    name: 5-aminomethyl-2-geranylthiouridine
    synonyms:
    - Δ
    identifiers:
    - ns: modomics.new_nomenclature
      id: 21510U
    - ns: modomics.short_name
      id: nm5ges2U
    structure: '[NH3+]Cc1cn(c(nc1=O)SC/C=C(/CCC=C(C)C)\C)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 33
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 36
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 33
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 39
      charge: -1
  20510U:
    id: 20510U
    name: 5-aminomethyl-2-selenouridine
    synonyms:
    - π
    identifiers:
    - ns: modomics.new_nomenclature
      id: 20510U
    - ns: modomics.short_name
      id: nm5se2U
    structure: '[NH3+]Cc1cn(c(=[Se])[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  2510U:
    id: 2510U
    name: 5-aminomethyl-2-thiouridine
    comments: <p>Observed as a component of unfractionated tRNA from E. coli mutants,
      as a biosynthetic precursor to mnm5s2U; not rigorously characterized by conventional
      means. No chemical synthesis reported.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - ∫
    - nm5s2U
    identifiers:
    - ns: modomics.new_nomenclature
      id: 2510U
    - ns: modomics.short_name
      id: nm5s2U
    - ns: cas
      id: 109666-14-0
    - ns: rnamods
      id: '71'
    structure: '[NH3+]Cc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  510U:
    id: 510U
    name: 5-aminomethyluridine
    synonyms:
    - ∪
    identifiers:
    - ns: modomics.new_nomenclature
      id: 510U
    - ns: modomics.short_name
      id: nm5U
    structure: '[NH3+]Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  531U:
    id: 531U
    name: 5-carbamoylhydroxymethyluridine
    synonyms:
    - r
    identifiers:
    - ns: modomics.short_name
      id: nchm5U
    - ns: modomics.new_nomenclature
      id: 531U
    structure: NC(=O)C(c1cn(c(=O)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  253U:
    id: 253U
    name: 5-carbamoylmethyl-2-thiouridine
    synonyms:
    - l
    identifiers:
    - ns: modomics.new_nomenclature
      id: 253U
    - ns: modomics.short_name
      id: ncm5s2U
    structure: NC(=O)Cc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  053U:
    id: 053U
    name: 5-carbamoylmethyl-2′-O-methyluridine
    comments: <p>The first preparation of ncm5Um was by conversion of cm5Um which
      had been isolated from tRNA in the same study. Conventional chemical synthesis
      of ncm5Um is reported in.</p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - ncm5Um
    - '~'
    - 5-carbamoylmethyl-2'-O-methyluridine
    identifiers:
    - ns: rnamods
      id: '76'
    - ns: modomics.short_name
      id: ncm5Um
    - ns: modomics.new_nomenclature
      id: 053U
    - ns: cas
      id: 60197-30-0
    structure: COC1C(O)C(OC1n1cc(CC(=O)N)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  53U:
    id: 53U
    name: 5-carbamoylmethyluridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - ncm5U
    - '&'
    identifiers:
    - ns: modomics.short_name
      id: ncm5U
    - ns: cas
      id: 29569-30-0
    - ns: modomics.new_nomenclature
      id: 53U
    - ns: rnamods
      id: '75'
    structure: NC(=O)Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  520U:
    id: 520U
    name: 5-carboxyhydroxymethyluridine
    comments: <p>The Chemical Abstracts registry number listed is for the natural
      (S)-isomer; the (R)-isomer registry number is 127911-55-1.</p> <p>Phylogenetic
      distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - 5-(carboxyhydroxymethyl)uridine
    - ≥
    - chm5U
    identifiers:
    - ns: cas
      id: 89708-80-5
    - ns: modomics.new_nomenclature
      id: 520U
    - ns: modomics.short_name
      id: chm5U
    - ns: rnamods
      id: '66'
    structure: '[O-]C(=O)C(c1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-])O'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  2540U:
    id: 2540U
    name: 5-carboxymethyl-2-thiouridine
    synonyms:
    - ℘
    identifiers:
    - ns: modomics.new_nomenclature
      id: 2540U
    - ns: modomics.short_name
      id: cm5s2U
    structure: '[O-]C(=O)Cc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  2151U:
    id: 2151U
    name: 5-carboxymethylaminomethyl-2-geranylthiouridine
    comments: <p>None</p> <p>Phylogenetic distribution<ul><li></li></ul></p>
    synonyms:
    - f
    - geranylated 5-carboxymethylaminomethyl-2-thiouridine
    - gcmnm5s2U
    identifiers:
    - ns: modomics.new_nomenclature
      id: 2151U
    - ns: modomics.short_name
      id: cmnm5ges2U
    - ns: cas
      id: 1401688-11-6
    - ns: rnamods
      id: '119'
    structure: '[O-]C(=O)C[NH2+]Cc1cn(c(nc1=O)SC/C=C(/CCC=C(C)C)\C)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 36
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 39
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 36
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 42
      charge: -1
  2051U:
    id: 2051U
    name: 5-carboxymethylaminomethyl-2-selenouridine
    synonyms:
    - ⊥
    identifiers:
    - ns: modomics.short_name
      id: cmnm5se2U
    - ns: modomics.new_nomenclature
      id: 2051U
    structure: '[O-]C(=O)C[NH2+]Cc1cn(c(=[Se])[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  251U:
    id: 251U
    name: 5-carboxymethylaminomethyl-2-thiouridine
    comments: <p>Alternate symbol is cmam5s2U.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - $
    - cmnm5s2U
    identifiers:
    - ns: modomics.short_name
      id: cmnm5s2U
    - ns: modomics.new_nomenclature
      id: 251U
    - ns: cas
      id: 78173-95-2
    - ns: pubchem.compound
      id: '3037867'
    - ns: rnamods
      id: '79'
    structure: '[O-]C(=O)C[NH2+]Cc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  051U:
    id: 051U
    name: 5-carboxymethylaminomethyl-2′-O-methyluridine
    comments: <p>Alternate symbol is cmam5Um. The natural nucleoside from E. coli
      tRNALeu was originally characterized by comparison of its NMR spectrum with
      that of synthetic material. The discovery of cmnm5Um is cited in as a meeting
      abstract, in which, however, the compound is neither named nor structural data
      presented. A recent and more rigorous structural characterization is reported
      in.</p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - 5-carboxymethylaminomethyl- 2'-O-methyluridine
    - )
    - cmnm5Um
    identifiers:
    - ns: cas
      id: 110419-13-1
    - ns: modomics.short_name
      id: cmnm5Um
    - ns: modomics.new_nomenclature
      id: 051U
    - ns: rnamods
      id: '78'
    structure: COC1C(O)C(OC1n1cc(C[NH2+]CC(=O)[O-])c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  51U:
    id: 51U
    name: 5-carboxymethylaminomethyluridine
    comments: <p>Alternate symbol is cmam5U.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - cmnm5U
    - '!'
    identifiers:
    - ns: rnamods
      id: '77'
    - ns: modomics.short_name
      id: cmnm5U
    - ns: modomics.new_nomenclature
      id: 51U
    - ns: pubchem.compound
      id: '194306'
    - ns: cas
      id: 69181-26-6
    structure: '[O-]C(=O)C[NH2+]Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  52U:
    id: 52U
    name: 5-carboxymethyluridine
    comments: <p>5-(Hydroxymethyl)cytidine and 5-(carboxymethyl)uridine were identified
      as the monophosphates by their UV spectra following separation by 2D-TLC (data
      not shown); however, availability of authentic compounds or of previously cited
      properties was not addressed. These structure assignments are therefore considered
      inconclusive.</p> <p>Phylogenetic distribution<ul><li>eukarya rRNA</li></ul></p>
    synonyms:
    - ◊
    - cm5U
    identifiers:
    - ns: pubchem.compound
      id: '3080720'
    - ns: modomics.short_name
      id: cm5U
    - ns: cas
      id: 20964-06-1
    - ns: modomics.new_nomenclature
      id: 52U
    - ns: rnamods
      id: '87'
    structure: '[O-]C(=O)Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  55U:
    id: 55U
    name: 5-cyanomethyluridine
    comments: <p>None</p> <p>Phylogenetic distribution<ul><li></li></ul></p>
    synonyms:
    - cnm5U
    - Ѷ
    - 5-cyanomethyl-uridine
    identifiers:
    - ns: cas
      id: 58479-73-5
    - ns: modomics.new_nomenclature
      id: 55U
    - ns: rnamods
      id: '120'
    - ns: modomics.short_name
      id: cnm5U
    structure: N#CCc1cn(c(=O)[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  071C:
    id: 071C
    name: 5-formyl-2′-O-methylcytidine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - °
    - f5Cm
    - 5-formyl-2'-O-methylcytidine
    identifiers:
    - ns: rnamods
      id: '95'
    - ns: modomics.short_name
      id: f5Cm
    - ns: modomics.new_nomenclature
      id: 071C
    - ns: cas
      id: 176858-79-0
    structure: COC1C(O)C(OC1n1cc(C=O)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  71C:
    id: 71C
    name: 5-formylcytidine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - 5-formylcytidine 5'-(dihydrogen phosphate)
    - RSQ
    - '[(2R,3S,4R,5R)-5-(4-azanyl-5-methanoyl-2-oxidanylidene-pyrimidin-1-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - f5C
    - '>'
    identifiers:
    - ns: modomics.short_name
      id: f5C
    - ns: modomics.new_nomenclature
      id: 71C
    - ns: pdb-ccd
      id: RSQ
    - ns: cas
      id: 148608-53-1
    - ns: rnamods
      id: '25'
    structure: O=Cc1cn(c(=O)nc1N)[C@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  50C:
    id: 50C
    name: 5-hydroxycytidine
    synonyms:
    - Ç
    identifiers:
    - ns: modomics.new_nomenclature
      id: 50C
    - ns: modomics.short_name
      id: ho5C
    structure: OC1C(O)C(OC1n1cc(O)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  51C:
    id: 51C
    name: 5-hydroxymethylcytidine
    comments: <p>5-(Hydroxymethyl)cytidine and 5-(carboxymethyl)uridine were identified
      as the monophosphates by their UV spectra following separation by 2D-TLC (data
      not shown); however, availability of authentic compounds or of previously cited
      properties was not addressed. These structure assignments are therefore considered
      inconclusive.</p> <p>Phylogenetic distribution<ul><li>eukarya rRNA</li></ul></p>
    synonyms:
    - ∅
    - hm5C
    identifiers:
    - ns: modomics.short_name
      id: hm5C
    - ns: cas
      id: 19235-17-7
    - ns: rnamods
      id: '84'
    - ns: modomics.new_nomenclature
      id: 51C
    structure: OCc1cn(c(=O)nc1N)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 17
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  50U:
    id: 50U
    name: 5-hydroxyuridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - ∝
    - ho5U
    identifiers:
    - ns: modomics.new_nomenclature
      id: 50U
    - ns: modomics.short_name
      id: ho5U
    - ns: rnamods
      id: '62'
    - ns: cas
      id: 957-77-7
    structure: OC1C(O)C(OC1n1cc(O)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  2521U:
    id: 2521U
    name: 5-methoxycarbonylmethyl-2-thiouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - 5-(o-methylaceto)-2-thio-2-deoxy-uridine-5'-monophosphate
    - 5-(2-methoxy-2-oxoethyl)-1-(5-O-phosphono-beta-D-ribofuranosyl)-2-thioxo-2,3-dihydropyrimidin-4(1H)-one
    - 70U
    - mcm5s2U
    - U
    - '3'
    - methyl 2-[1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-4-oxo-2-sulfanylidene-pyrimidin-5-yl]ethanoate
    identifiers:
    - ns: pdb-ccd
      id: 70U
    - ns: rnamods
      id: '70'
    - ns: modomics.new_nomenclature
      id: 2521U
    - ns: modomics.short_name
      id: mcm5s2U
    - ns: cas
      id: 20299-15-4
    structure: COC(=O)Cc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  0521U:
    id: 0521U
    name: 5-methoxycarbonylmethyl-2′-O-methyluridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - ∩
    - 5-methoxycarbonylmethyl-2'-O-methyluridine
    - mcm5Um
    identifiers:
    - ns: modomics.short_name
      id: mcm5Um
    - ns: cas
      id: 60197-31-1
    - ns: rnamods
      id: '69'
    - ns: modomics.new_nomenclature
      id: 0521U
    structure: COC1C(O)C(OC1n1cc(CC(=O)OC)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  521U:
    id: 521U
    name: 5-methoxycarbonylmethyluridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - '1'
    - mcm5U
    identifiers:
    - ns: cas
      id: 29428-50-0
    - ns: modomics.short_name
      id: mcm5U
    - ns: rnamods
      id: '68'
    - ns: modomics.new_nomenclature
      id: 521U
    structure: COC(=O)Cc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  501U:
    id: 501U
    name: 5-methoxyuridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - '5'
    - mo5U
    identifiers:
    - ns: cas
      id: 35542-01-9
    - ns: modomics.short_name
      id: mo5U
    - ns: modomics.new_nomenclature
      id: 501U
    - ns: rnamods
      id: '63'
    - ns: pubchem.compound
      id: '169704'
    structure: COc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  25U:
    id: 25U
    name: 5-methyl-2-thiouridine
    comments: <p>Alternate symbol is s2T. The occurrence of m5s2U in archaeal tRNA
      is unusual.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - F
    - m5s2U
    identifiers:
    - ns: pubchem.compound
      id: '3035361'
    - ns: cas
      id: 32738-09-3
    - ns: modomics.short_name
      id: m5s2U
    - ns: rnamods
      id: '59'
    - ns: modomics.new_nomenclature
      id: 25U
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=S)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  21511U:
    id: 21511U
    name: 5-methylaminomethyl-2-geranylthiouridine
    comments: <p>None</p> <p>Phylogenetic distribution<ul><li></li></ul></p>
    synonyms:
    - geranylated 5-methylaminomethyl-2-thiouridine
    - gmnm5s2U
    - h
    identifiers:
    - ns: cas
      id: 1401688-10-5
    - ns: rnamods
      id: '118'
    - ns: modomics.new_nomenclature
      id: 21511U
    - ns: modomics.short_name
      id: mnm5ges2U
    structure: C[NH2+]Cc1cn(c(nc1=O)SC/C=C(/CCC=C(C)C)\C)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 33
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 36
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 33
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 39
      charge: -1
  20511U:
    id: 20511U
    name: 5-methylaminomethyl-2-selenouridine
    comments: <p>Earlier reports of se4U in RNA cited in were discounted, as discussed
      in. Although only one selenonucleoside, mnm5se2U, has been structurally characterized,
      it is likely that others exist but have not been detected due to oxidation,
      for example, in eukaryotic tRNA.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>bacteria tRNA</li></ul></p>
    synonyms:
    - mnm5se2U
    - ≅
    identifiers:
    - ns: rnamods
      id: '74'
    - ns: cas
      id: 89314-80-7
    - ns: modomics.new_nomenclature
      id: 20511U
    - ns: pubchem.compound
      id: '6336326'
    - ns: modomics.short_name
      id: mnm5se2U
    structure: C[NH2+]Cc1cn(c(=[Se])[nH]c1=O)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  2511U:
    id: 2511U
    name: 5-methylaminomethyl-2-thiouridine
    comments: <p>Alternate symbol is mam5s2U.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>bacteria tRNA</li></ul></p>
    synonyms:
    - S
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-[5-(methylaminomethyl)-4-oxo-2-sulfanylidene-pyrimidin-1-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    - 5-[(methylamino)methyl]-1-(5-O-phosphono-beta-D-ribofuranosyl)-2-thioxo-2,3-dihydropyrimidin-4(1H)-one
    - U8U
    - 5-methylaminomethyl-2-thiouridine-5'-monophosphate
    - mnm5s2U
    identifiers:
    - ns: rnamods
      id: '73'
    - ns: pdb-ccd
      id: U8U
    - ns: modomics.short_name
      id: mnm5s2U
    - ns: modomics.new_nomenclature
      id: 2511U
    - ns: pubchem.compound
      id: '3036488'
    - ns: cas
      id: 32860-54-1
    structure: CNCc1cn(c(=S)[nH]c1=O)[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  511U:
    id: 511U
    name: 5-methylaminomethyluridine
    comments: <p>Alternate symbol is mam5U. More thorough characterization in.</p>
      <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - 5-[(methylamino)methyl]uridine 5'-(dihydrogen phosphate)
    - U
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-[5-(methylaminomethyl)-2,4-dioxo-pyrimidin-1-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - MNU
    - '{'
    - mnm5U
    - (2r,4s)-1-[(4r)-3,4-dihydroxytetrahydrofuran-2-yl]-5-[(methylamino)methyl]-1,2,3,4-tetrahydropyrimidine-2,4-diol-5'-monophosphate
    identifiers:
    - ns: modomics.new_nomenclature
      id: 511U
    - ns: modomics.short_name
      id: mnm5U
    - ns: pdb-ccd
      id: MNU
    - ns: rnamods
      id: '72'
    - ns: cas
      id: 72667-55-1
    structure: CNCc1cn(c(=O)[nH]c1=O)[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  5C:
    id: 5C
    name: 5-methylcytidine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>eukarya
      mRNA</li></ul></p>
    synonyms:
    - m5C
    - 5MC
    - C
    - '?'
    - 5-methylcytidine-5'-monophosphate
    - 5-methylcytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-amino-5-methyl-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: cas
      id: 2140-61-6
    - ns: rnamods
      id: '21'
    - ns: pdb-ccd
      id: 5MC
    - ns: pubchem.compound
      id: '92918'
    - ns: modomics.short_name
      id: m5C
    - ns: modomics.new_nomenclature
      id: 5C
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  58U:
    id: 58U
    name: 5-methyldihydrouridine
    comments: <p>This RNA is reported as a chromatin-associated 3.2-3.8S species,
      with an unusual concentration of dihydropyrimidine nucleosides, but its occurrence
      as a separate class of RNA remains controversial. For review, see. Characterization
      of this nucleoside, not otherwise reported in RNA, was based on detection of
      2-amino-isobutyric acid following treatment with alkali. Direct comparison with
      the authentic nucleoside was not made.</p> <p>Phylogenetic distribution<ul><li>eukarya
      chromosomal RNA</li></ul></p>
    synonyms:
    - ρ
    - m5D
    identifiers:
    - ns: rnamods
      id: '93'
    - ns: cas
      id: 23067-10-9
    - ns: modomics.new_nomenclature
      id: 58U
    - ns: modomics.short_name
      id: m5D
    structure: OC1C(O)C(OC1N1CC(C)C(=O)NC1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  5U:
    id: 5U
    name: 5-methyluridine
    comments: <p>Alternate commonly used symbol is T. Other common names are thymine
      riboside and ribosylthymine. Occurrence is rare in archaeal tRNA. Enzymatic
      synthesis was reported in, which preceded the first report of chemical synthesis.</p>
      <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya
      tRNA</li><li>bacteria rRNA</li><li>bacteria tmRNA</li></ul></p>
    synonyms:
    - m5U
    - 5MU
    - T
    - U
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-methyluridine 5'-(dihydrogen phosphate)
    - 5-methyluridine 5'-monophosphate
    identifiers:
    - ns: modomics.new_nomenclature
      id: 5U
    - ns: pubchem.compound
      id: '445408'
    - ns: modomics.short_name
      id: m5U
    - ns: pdb-ccd
      id: 5MU
    - ns: rnamods
      id: '52'
    - ns: cas
      id: 1463-10-1
    structure: O[C@H]1[C@H](O)[C@@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  254U:
    id: 254U
    name: 5-taurinomethyl-2-thiouridine
    comments: <p>Alternate symbol is taum5s2U. See also</p> <p>Phylogenetic distribution<ul><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - tm5s2U
    - ∃
    identifiers:
    - ns: modomics.new_nomenclature
      id: 254U
    - ns: modomics.short_name
      id: tm5s2U
    - ns: rnamods
      id: '99'
    - ns: cas
      id: 497258-54-5
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cc(C[NH2+]CCS(=O)(=O)[O-])c(=O)[nH]c1=S)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 32
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 35
      charge: -1
  54U:
    id: 54U
    name: 5-taurinomethyluridine
    comments: <p>Alternate symbol is tau5U. See also</p> <p>Phylogenetic distribution<ul><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - Ê
    - tm5U
    identifiers:
    - ns: modomics.new_nomenclature
      id: 54U
    - ns: rnamods
      id: '98'
    - ns: modomics.short_name
      id: tm5U
    - ns: cas
      id: 497258-53-4
    structure: OC1C(O)C(OC1n1cc(C[NH2+]CCS(=O)(=O)[O-])c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  47G:
    id: 47G
    name: 7-aminocarboxypropyl-demethylwyosine
    synonyms:
    - ¥
    identifiers:
    - ns: modomics.new_nomenclature
      id: 47G
    - ns: modomics.short_name
      id: yW-86
    structure: '[O-]C(=O)C(CCc1c(C)nc2n1c(=O)c1c([nH]2)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 34
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 37
      charge: -1
  347G:
    id: 347G
    name: 7-aminocarboxypropylwyosine
    synonyms:
    - Ω
    identifiers:
    - ns: modomics.new_nomenclature
      id: 347G
    - ns: modomics.short_name
      id: yW-72
    structure: '[O-]C(=O)C(CCc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])[NH3+]'
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 31
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 34
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 31
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 37
      charge: -1
  348G:
    id: 348G
    name: 7-aminocarboxypropylwyosine methyl ester
    synonyms:
    - ⇑
    identifiers:
    - ns: modomics.new_nomenclature
      id: 348G
    - ns: modomics.short_name
      id: yW-58
    structure: COC(=O)C(CCc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])[NH3+]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  101G:
    id: 101G
    name: 7-aminomethyl-7-deazaguanosine
    comments: <p>preQ0 and preQ1 are undermodified Q nucleosides isolated from methyl-deficient
      mutant E. coli tRNA.</p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - ∉
    - preQ1
    identifiers:
    - ns: cas
      id: 66048-70-2
    - ns: modomics.new_nomenclature
      id: 101G
    - ns: rnamods
      id: '48'
    - ns: modomics.short_name
      id: preQ1tRNA
    structure: '[NH3+]Cc1cn(c2c1c(=O)[nH]c(n2)N)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]'
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  100G:
    id: 100G
    name: 7-cyano-7-deazaguanosine
    comments: <p>preQ0 and preQ1 are undermodified Q nucleosides isolated from methyl-deficient
      mutant E. coli tRNA.</p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - preQ0
    - φ
    identifiers:
    - ns: modomics.short_name
      id: preQ0tRNA
    - ns: cas
      id: 61210-21-7
    - ns: modomics.new_nomenclature
      id: 100G
    - ns: rnamods
      id: '47'
    structure: N#Cc1cn(c2c1c(=O)[nH]c(n2)N)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  7G:
    id: 7G
    name: 7-methylguanosine
    comments: <p>First characterized as the base and later as the monoribonucleotide.</p>
      <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya
      tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>eukarya
      mRNA</li></ul></p>
    synonyms:
    - '7'
    - m7G
    identifiers:
    - ns: rnamods
      id: '31'
    - ns: cas
      id: 20244-86-4
    - ns: modomics.short_name
      id: m7G
    - ns: modomics.new_nomenclature
      id: 7G
    structure: OC1[C@H](O)[C@@H](O[C@@H]1n1c[n+](c2c1N=C(N)NC2O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  8A:
    id: 8A
    name: 8-methyladenosine
    comments: <p>None</p> <p>Phylogenetic distribution<ul><li>bacteria rRNA</li></ul></p>
    synonyms:
    - m8A
    - â
    identifiers:
    - ns: cas
      id: 56973-12-7
    - ns: rnamods
      id: '114'
    - ns: modomics.new_nomenclature
      id: 8A
    - ns: modomics.short_name
      id: m8A
    structure: OC1C(O)C(OC1n1c(C)nc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  02G:
    id: 02G
    name: N2,2′-O-dimethylguanosine
    comments: <p>A preliminary report of characterization is given in.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - γ
    - N2,2'-O-dimethylguanosine
    - m2Gm
    identifiers:
    - ns: modomics.short_name
      id: m2Gm
    - ns: rnamods
      id: '34'
    - ns: cas
      id: 135023-21-1
    - ns: modomics.new_nomenclature
      id: 02G
    structure: COC1C(O)C(OC1n1cnc2c1nc(NC)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  027G:
    id: 027G
    name: N2,7,2′-O-trimethylguanosine
    comments: '<p>Sources of tRNA: Aeropyrum pernix, Stetteria hydrogenophila. See
      also: Noon, K.R. et al. (2003) J. Bacteriol., 185, 5483-5490. Coauthors for
      this work: Van Wagoner, R.M., Hashizume, T., Nomura, M., Sako, Y.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li></ul></p>'
    synonyms:
    - æ
    - m2,7Gm
    - N2,7,2'-O-trimethylguanosine
    identifiers:
    - ns: cas
      id: 872710-82-2
    - ns: modomics.new_nomenclature
      id: 027G
    - ns: modomics.short_name
      id: m2,7Gm
    - ns: rnamods
      id: '106'
    structure: COC1[C@H](O)[C@@H](O[C@@H]1n1c[n+](c2c1[NH+]=C(NC)NC2O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  27G:
    id: 27G
    name: N2,7-dimethylguanosine
    comments: <p>This 5'-cap nucleoside is joined to the RNA through a unique 3'-triphosphate
      bridge (GpppN...).</p> <p>Phylogenetic distribution<ul><li>eukarya mRNA</li></ul></p>
    synonyms:
    - m2,7G
    - ∨
    identifiers:
    - ns: modomics.short_name
      id: m2,7G
    - ns: rnamods
      id: '90'
    - ns: modomics.new_nomenclature
      id: 27G
    - ns: cas
      id: 62122-07-0
    structure: CNC1=[NH+]c2c(C(N1)O)[n+](cn2[C@H]1O[C@H]([C@H](C1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  022G:
    id: 022G
    name: N2,N2,2′-O-trimethylguanosine
    comments: <p>Preliminary communication of structural characterization and chemical
      synthesis is given in. Unknown nucleoside N-26 in Sulfolobus acidocaldarius
      tRNAiMet was postulated to be m22Gm in, without experimental evidence.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - '|'
    - m22Gm
    - N2,N2,2'-O-trimethylguanosine
    identifiers:
    - ns: modomics.new_nomenclature
      id: 022G
    - ns: rnamods
      id: '35'
    - ns: cas
      id: 113886-73-0
    - ns: modomics.short_name
      id: m2,2Gm
    structure: COC1C(O)C(OC1n1cnc2c1nc([nH]c2=O)N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  227G:
    id: 227G
    name: N2,N2,7-trimethylguanosine
    comments: <p>The structure was first assigned using material from 2-10S RNA from
      Chinese hamster ovary cells, and later from snRNA from Novikoff hepatoma ascites
      cells. More rigorous characterization of the synthetic nucleoside used for comparison
      is given in.</p> <p>Phylogenetic distribution<ul><li>eukarya mRNA</li><li>eukarya
      snRNA</li></ul></p>
    synonyms:
    - ∠
    - m2,2,7G
    identifiers:
    - ns: rnamods
      id: '91'
    - ns: modomics.new_nomenclature
      id: 227G
    - ns: modomics.short_name
      id: m2,2,7G
    - ns: cas
      id: 40027-70-1
    structure: OC1[C@H](O)[C@@H](O[C@@H]1n1c[n+](c2c1[NH+]=C(NC2O)N(C)C)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  22G:
    id: 22G
    name: N2,N2-dimethylguanosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      tRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - M2G
    - G
    - '[(2R,3S,4R,5R)-5-(2-dimethylamino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - m22G
    - n2-dimethylguanosine-5'-monophosphate
    - N,N-dimethylguanosine 5'-(dihydrogen phosphate)
    - R
    identifiers:
    - ns: modomics.short_name
      id: m2,2G
    - ns: rnamods
      id: '33'
    - ns: cas
      id: 2140-67-2
    - ns: pubchem.compound
      id: '601633'
    - ns: modomics.new_nomenclature
      id: 22G
    - ns: pdb-ccd
      id: M2G
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc([nH]c2=O)N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  2G:
    id: 2G
    name: N2-methylguanosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>eukarya
      tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>eukarya
      snRNA</li></ul></p>
    synonyms:
    - L
    - G
    - 2n-methylguanosine-5'-monophosphate
    - N-methylguanosine 5'-(dihydrogen phosphate)
    - m2G
    - 2MG
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(2-methylamino-6-oxo-1H-purin-9-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: cas
      id: 2140-77-4
    - ns: pubchem.compound
      id: '3035422'
    - ns: modomics.short_name
      id: m2G
    - ns: pdb-ccd
      id: 2MG
    - ns: rnamods
      id: '30'
    - ns: modomics.new_nomenclature
      id: 2G
    structure: CNc1[nH]c(=O)c2c(n1)n(cn2)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 24
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 24
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  04C:
    id: 04C
    name: N4,2′-O-dimethylcytidine
    comments: <p>More thorough characterization is reported in.</p> <p>Phylogenetic
      distribution<ul><li>bacteria rRNA</li></ul></p>
    synonyms:
    - λ
    - N-methyl-2'-O-methylcytidine 5'-(dihydrogen phosphate)
    - C
    - m4Cm
    - '[(2R,3R,4R,5R)-3-hydroxy-4-methoxy-5-(4-methylamino-2-oxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N4,2'-O-dimethylcytidine
    - 4n,o2'-methylcytidine-5'-monophosphate
    - 4OC
    identifiers:
    - ns: modomics.short_name
      id: m4Cm
    - ns: modomics.new_nomenclature
      id: 04C
    - ns: rnamods
      id: '83'
    - ns: cas
      id: 13048-95-8
    - ns: pdb-ccd
      id: 4OC
    structure: CO[C@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(nc1=O)NC)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  044C:
    id: 044C
    name: N4,N4,2′-O-trimethylcytidine
    comments: <p>Source of RNA, Aeropyrum pernix attributed to 16S rRNA although tRNA
      cannot be rigorously excluded.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li></ul></p>
    synonyms:
    - m42Cm
    - β
    - N4,N4,2'-O-trimethylcytidine
    identifiers:
    - ns: modomics.short_name
      id: m4,4Cm
    - ns: modomics.new_nomenclature
      id: 044C
    - ns: rnamods
      id: '107'
    - ns: cas
      id: 34218-81-0
    structure: COC1C(O)C(OC1n1ccc(nc1=O)N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  44C:
    id: 44C
    name: N4,N4-dimethylcytidine
    synonyms:
    - μ
    identifiers:
    - ns: pubchem.compound
      id: '3082389'
    - ns: modomics.new_nomenclature
      id: 44C
    - ns: modomics.short_name
      id: m4,4C
    structure: OC1C(O)C(OC1n1ccc(nc1=O)N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  042C:
    id: 042C
    name: N4-acetyl-2′-O-methylcytidine
    comments: <p>Preliminary communication of structural characterization and chemical
      synthesis is given in.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>archaea
      rRNA</li></ul></p>
    synonyms:
    - ℵ
    - ac4Cm
    - N4-acetyl-2'-O-methylcytidine
    identifiers:
    - ns: rnamods
      id: '27'
    - ns: modomics.new_nomenclature
      id: 042C
    - ns: modomics.short_name
      id: ac4Cm
    - ns: cas
      id: 113886-71-8
    structure: COC1C(O)C(OC1n1ccc(nc1=O)NC(=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  42C:
    id: 42C
    name: N4-acetylcytidine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>archaea rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - '[(2R,3S,4R,5R)-5-(4-acetamido-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N-acetylcytidine 5'-(dihydrogen phosphate)
    - ac4C
    - N
    - M
    - 4AC
    - n(4)-acetylcytidine-5'-monophosphate
    identifiers:
    - ns: rnamods
      id: '24'
    - ns: pdb-ccd
      id: 4AC
    - ns: modomics.short_name
      id: ac4C
    - ns: modomics.new_nomenclature
      id: 42C
    - ns: cas
      id: 3768-18-1
    structure: CC(=O)Nc1ccn(c(=O)n1)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  4C:
    id: 4C
    name: N4-methylcytidine
    comments: <p>The base (m4Cyt) was previously reported in acid-treated HeLa rRNA,
      and was presumed to have originated from N4,2'-O-dimethylcytidine.</p> <p>Phylogenetic
      distribution<ul><li>eukarya rRNA</li></ul></p>
    synonyms:
    - m4C
    - ν
    identifiers:
    - ns: modomics.new_nomenclature
      id: 4C
    - ns: modomics.short_name
      id: m4C
    - ns: cas
      id: 10578-79-7
    - ns: rnamods
      id: '82'
    structure: CNc1ccn(c(=O)n1)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  06A:
    id: 06A
    name: N6,2′-O-dimethyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya mRNA</li><li>eukarya
      snRNA</li></ul></p>
    synonyms:
    - m6Am
    - N6,2'-O-dimethyladenosine
    - χ
    identifiers:
    - ns: modomics.short_name
      id: m6Am
    - ns: rnamods
      id: '88'
    - ns: modomics.new_nomenclature
      id: 06A
    - ns: cas
      id: 57817-83-1
    structure: COC1C(O)C(OC1n1cnc2c1ncnc2NC)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  066A:
    id: 066A
    name: N6,N6,2′-O-trimethyladenosine
    comments: <p>Presence of m62Am in adenovirus mRNA was inferred from 3H labeling
      data, but it was not chemically characterized.</p> <p>Phylogenetic distribution<ul><li>eukarya
      mRNA</li></ul></p>
    synonyms:
    - N6,N6,2'-O-trimethyladenosine
    - η
    - m62Am
    identifiers:
    - ns: modomics.new_nomenclature
      id: 066A
    - ns: rnamods
      id: '89'
    - ns: modomics.short_name
      id: m6,6Am
    - ns: cas
      id: 30891-53-3
    structure: COC1C(O)C(OC1n1cnc2c1ncnc2N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  66A:
    id: 66A
    name: N6,N6-dimethyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea rRNA</li><li>bacteria
      rRNA</li><li>eukarya rRNA</li></ul></p>
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-(6-dimethylaminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - ζ
    - MA6
    - m62A
    - 6n-dimethyladenosine-5'-monophoshate
    - N,N-dimethyladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pubchem.compound
      id: '72266'
    - ns: rnamods
      id: '80'
    - ns: modomics.short_name
      id: m6,6A
    - ns: pdb-ccd
      id: MA6
    - ns: modomics.new_nomenclature
      id: 66A
    - ns: cas
      id: 2620-62-4
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1cnc2c1ncnc2N(C)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  60A:
    id: 60A
    name: N6-(cis-hydroxyisopentenyl)adenosine
    comments: <p>Also known as cis-zeatin riboside (symbol cZ). The name zeatin riboside
      refers to the trans-isomer, a cytokinin (registry number 6025-53-2).</p> <p>Phylogenetic
      distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - io6A
    - '`'
    identifiers:
    - ns: cas
      id: 15896-46-5
    - ns: modomics.new_nomenclature
      id: 60A
    - ns: rnamods
      id: '8'
    - ns: modomics.short_name
      id: io6A
    structure: OCC(=CCNc1ncnc2c1ncn2C1OC(C(C1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  64A:
    id: 64A
    name: N6-acetyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - ac6A
    - ⇓
    identifiers:
    - ns: rnamods
      id: '102'
    - ns: modomics.short_name
      id: ac6A
    - ns: cas
      id: 16265-37-5
    - ns: modomics.new_nomenclature
      id: 64A
    structure: CC(=O)Nc1ncnc2c1ncn2C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 20
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  67A:
    id: 67A
    name: N6-formyladenosine
    synonyms:
    - Ϩ
    identifiers:
    - ns: modomics.short_name
      id: f6A
    - ns: modomics.new_nomenclature
      id: 67A
    structure: O=CNc1ncnc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  65A:
    id: 65A
    name: N6-glycinylcarbamoyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - g6A
    - ≡
    identifiers:
    - ns: modomics.new_nomenclature
      id: 65A
    - ns: modomics.short_name
      id: g6A
    - ns: rnamods
      id: '10'
    - ns: cas
      id: 29902-55-4
    structure: O=C(Nc1ncnc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])NCC(=O)[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  68A:
    id: 68A
    name: N6-hydroxymethyladenosine
    synonyms:
    - Ϫ
    identifiers:
    - ns: modomics.short_name
      id: hm6A
    - ns: modomics.new_nomenclature
      id: 68A
    structure: OCNc1ncnc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  63A:
    id: 63A
    name: N6-hydroxynorvalylcarbamoyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - √
    - hn6A
    identifiers:
    - ns: cas
      id: 146426-20-2
    - ns: modomics.short_name
      id: hn6A
    - ns: rnamods
      id: '14'
    - ns: modomics.new_nomenclature
      id: 63A
    structure: CCC(C(C(=O)[O-])NC(=O)Nc1ncnc2c1ncn2C1OC(C(C1O)O)COP(=O)([O-])[O-])O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  61A:
    id: 61A
    name: N6-isopentenyladenosine
    comments: <p>i6A is somewhat characteristically eukaryal but does occur in some
      bacterial tRNAs, e.g., E. coli. It appears to be absent in archaea. Symbol used
      in early literature is IPA.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - +
    - i6A
    identifiers:
    - ns: cas
      id: 7724-76-7
    - ns: pubchem.compound
      id: '266767'
    - ns: modomics.new_nomenclature
      id: 61A
    - ns: modomics.short_name
      id: i6A
    - ns: rnamods
      id: '6'
    structure: CC(=CCNc1ncnc2c1ncn2C1OC(C(C1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  662A:
    id: 662A
    name: N6-methyl-N6-threonylcarbamoyladenosine
    comments: <p>Previously used symbol is mt6A.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - A
    - (2S,3R)-2-[[[9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]purin-6-yl]-methyl-carbamoyl]amino]-3-hydroxy-butanoic
      acid
    - E
    - AET
    - n-[n-(9-b-d-ribofuranosylpurin-6-yl)methylcarbamoyl]threonine-5'-monophosphate
    - (2S,3R)-2-{[(9-{(2R,3R,4S,5R)-3,4-dihydroxy-5-[(phosphonooxy)methyl]tetrahydrofuran-2-yl}-9H-purin-6-yl)(methyl)carbamoyl]amino}-3-hydroxybutanoic
      acid (non-preferred name)
    - m6t6A
    identifiers:
    - ns: modomics.new_nomenclature
      id: 662A
    - ns: rnamods
      id: '13'
    - ns: pdb-ccd
      id: AET
    - ns: cas
      id: 39667-81-7
    - ns: modomics.short_name
      id: m6t6A
    structure: C[C@@H]([C@H](C(=O)O)NC(=O)N(c1ncnc2c1ncn2[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-])C)O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  6A:
    id: 6A
    name: N6-methyladenosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>archaea rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>eukarya
      mRNA</li><li>eukarya snRNA</li></ul></p>
    synonyms:
    - m6A
    - '='
    identifiers:
    - ns: cas
      id: 1867-73-8
    - ns: rnamods
      id: '3'
    - ns: modomics.short_name
      id: m6A
    - ns: modomics.new_nomenclature
      id: 6A
    structure: CNc1ncnc2c1ncn2C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 18
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  62A:
    id: 62A
    name: N6-threonylcarbamoyladenosine
    comments: <p>[1] reports characterization of the base of this nucleoside. The
      L configuration for threonine in t6A was established in.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - t6A
    - '6'
    identifiers:
    - ns: cas
      id: 24719-82-2
    - ns: rnamods
      id: '11'
    - ns: modomics.short_name
      id: t6A
    - ns: modomics.new_nomenclature
      id: 62A
    structure: O=C(Nc1ncnc2c1ncn2[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])NC(=O)C(C(O)C)N
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  A:
    id: A
    name: adenosine
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    - adenosine-5'-monophosphate
    - 5'-adenylic acid
    identifiers:
    - ns: pubchem.compound
      id: '60961'
    - ns: pdb-ccd
      id: A
    - ns: modomics.short_name
      id: A
    - ns: modomics.new_nomenclature
      id: A
    structure: OC1C(O)C(OC1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  20C:
    id: 20C
    name: agmatidine
    comments: <p>[1]</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - C+
    - ¿
    identifiers:
    - ns: rnamods
      id: '113'
    - ns: modomics.new_nomenclature
      id: 20C
    - ns: modomics.short_name
      id: C+
    - ns: cas
      id: 1221169-70-5
    structure: OC1C(O)C(OC1n1ccc(=N)[nH+]c1NCCCCNC(=[NH2+])N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  103G:
    id: 103G
    name: archaeosine
    comments: "<p>Symbol G+ was assigned based on the positive charge carried by the\
      \ nucleoside, as noted at the time of its original discovery; G* or G*-15 have\
      \ been used but are no longer preferred. Alternate name is 7-formamidino-7-deazaguanosine.\
      \ The Chemical Abstracts Index Name is based on nomenclature for the 4(1H)-quinazolinone\
      \ ring system. Chemical synthesis of the corresponding base is reported in.\r\
      \nThe bacterial nucleoside preQ0 is a biosynthetic precursor of G+.</p> <p>Phylogenetic\
      \ distribution<ul><li>archaea tRNA</li></ul></p>"
    synonyms:
    - (
    - G+
    identifiers:
    - ns: cas
      id: 148608-52-0
    - ns: modomics.short_name
      id: G+
    - ns: rnamods
      id: '49'
    - ns: modomics.new_nomenclature
      id: 103G
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cc(c2c1nc(N)[nH]c2=O)C(=[NH2+])N)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  69A:
    id: 69A
    name: cyclic N6-threonylcarbamoyladenosine
    synonyms:
    - e
    identifiers:
    - ns: modomics.new_nomenclature
      id: 69A
    - ns: modomics.short_name
      id: ct6A
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cnc2c1ncnc2/N=C\1/OC(=O)C(N1)C(O)C)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 32
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 35
      charge: -1
  C:
    id: C
    name: cytidine
    synonyms:
    - C
    - 5'-cytidylic acid
    - cytidine-5'-monophosphate
    - '[(2R,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pubchem.compound
      id: '6175'
    - ns: modomics.short_name
      id: C
    - ns: pdb-ccd
      id: C
    - ns: modomics.new_nomenclature
      id: C
    structure: OC1C(O)C(OC1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 18
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
  8U:
    id: 8U
    name: dihydrouridine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>bacteria rRNA</li><li>eukarya snRNA</li><li>eukarya
      chromosomal RNA</li></ul></p>
    synonyms:
    - 5'-uridylic acid
    - '[(2R,3S,4R,5R)-5-(2,4-dioxo-1,3-diazinan-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    - H2U
    - D
    - 5,6-dihydrouridine-5'-monophosphate
    identifiers:
    - ns: rnamods
      id: '51'
    - ns: pubchem.compound
      id: '94312'
    - ns: cas
      id: 5627-05-4
    - ns: modomics.short_name
      id: D
    - ns: pdb-ccd
      id: H2U
    - ns: modomics.new_nomenclature
      id: 8U
    structure: O=C1CCN(C(=O)N1)[C@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  102G:
    id: 102G
    name: epoxyqueuosine
    comments: <p></p> <p>Phylogenetic distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - oQ
    - ς
    identifiers:
    - ns: modomics.short_name
      id: oQtRNA
    - ns: rnamods
      id: '44'
    - ns: cas
      id: 107865-20-3
    - ns: modomics.new_nomenclature
      id: 102G
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cc(c2c1nc(N)[nH]c2=O)CNC1C(O)C(C2C1O2)O)COP(=O)([O-])[O-]
    base_monomers:
    - 10G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  104G:
    id: 104G
    name: galactosyl-queuosine
    comments: <p>Symbol Q* is also used for either manQ, galQ, or a mixture of the
      two.</p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - galQ
    - '9'
    identifiers:
    - ns: cas
      id: 60426-58-6
    - ns: modomics.new_nomenclature
      id: 104G
    - ns: rnamods
      id: '45'
    - ns: modomics.short_name
      id: galQtRNA
    structure: OCC1O[C@@H](OC2C(C=CC2O)NCc2cn(c3c2c(=O)[nH]c(n3)N)[C@@H]2O[C@@H](C([C@@H]2O)O)COP(=O)([O-])[O-])C([C@@H]([C@H]1O)O)O
    base_monomers:
    - 10G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 37
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 40
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 43
      charge: -1
  G:
    id: G
    name: guanosine
    synonyms:
    - 5'-guanylic acid
    - G
    - guanosine-5'-monophosphate
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: modomics.new_nomenclature
      id: G
    - ns: pdb-ccd
      id: G
    - ns: pubchem.compound
      id: '6802'
    - ns: modomics.short_name
      id: G
    structure: OC1C(O)C(OC1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  2165A:
    id: 2165A
    name: hydroxy-N6-threonylcarbamoyladenosine
    synonyms:
    - «
    identifiers:
    - ns: modomics.new_nomenclature
      id: 2165A
    - ns: modomics.short_name
      id: ht6A
    structure: OCC(C(C(=O)[O-])NC(=O)Nc1ncnc2c1ncn2[C@@H]1O[C@@H](C(C1O)O)COP(=O)([O-])[O-])O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 29
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 32
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 35
      charge: -1
  34830G:
    id: 34830G
    name: hydroxywybutosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Structural characterization was made from the acid-liberated base. A Chemical
      Abstracts registry number was then assigned to the corresponding ribonucleoside.
      Common name for the corresponding base is hydroxy-Y.</p> <p>Phylogenetic distribution<ul><li>eukarya
      tRNA</li></ul></p>
    synonyms:
    - ⊆
    - OHyW
    identifiers:
    - ns: rnamods
      id: '39'
    - ns: cas
      id: 84270-21-3
    - ns: modomics.new_nomenclature
      id: 34830G
    - ns: modomics.short_name
      id: OHyW
    structure: COC(=O)C(C(Cc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])O)NC(=O)OC
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  9A:
    id: 9A
    name: inosine
    comments: <p>The presence of I in mRNA had been implied earlier from discrepencies
      between genomic and cDNA sequences, but provides the first direct evidence for
      its occurrence.</p> <p>Phylogenetic distribution<ul><li>archaea tRNA</li><li>bacteria
      tRNA</li><li>eukarya tRNA</li><li>eukarya mRNA</li></ul></p>
    synonyms:
    - 9-(5-O-phosphono-alpha-D-xylofuranosyl)-1,9-dihydro-6H-purin-6-one
    - I
    - '[(2R,3S,4R,5R)-3,4-bis(oxidanyl)-5-(6-oxidanylidene-1H-purin-9-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - inosinic acid
    identifiers:
    - ns: pdb-ccd
      id: I
    - ns: rnamods
      id: '17'
    - ns: pubchem.compound
      id: '6021'
    - ns: cas
      id: 58-63-9
    - ns: modomics.short_name
      id: I
    - ns: modomics.new_nomenclature
      id: 9A
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  42G:
    id: 42G
    name: isowyosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Numbering is based on 1H-imidazo[1,2-a]purine.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li></ul></p>
    synonyms:
    - imG2
    - ⊇
    identifiers:
    - ns: cas
      id: 577773-09-2
    - ns: modomics.new_nomenclature
      id: 42G
    - ns: modomics.short_name
      id: imG2
    - ns: rnamods
      id: '101'
    structure: OC1C(COP(=O)([O-])[O-])OC(C1O)n1cnc2c1[nH]c1nc(c(n1c2=O)C)C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
  106G:
    id: 106G
    name: mannosyl-queuosine
    synonyms:
    - '8'
    identifiers:
    - ns: modomics.short_name
      id: manQtRNA
    - ns: modomics.new_nomenclature
      id: 106G
    structure: OCC1O[C@@H](OC2C(C=CC2O)NCc2cn(c3c2c(=O)[nH]c(n3)N)[C@@H]2O[C@@H](C([C@@H]2O)O)COP(=O)([O-])[O-])C([C@@H]([C@@H]1O)O)O
    base_monomers:
    - 10G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 37
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 40
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 43
      charge: -1
  3480G:
    id: 3480G
    name: methylated undermodified hydroxywybutosine
    synonyms:
    - y
    identifiers:
    - ns: modomics.new_nomenclature
      id: 3480G
    - ns: modomics.short_name
      id: OHyWy
    structure: COC(=O)C(C(Cc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-])O)N
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 32
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 35
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 32
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 38
      charge: -1
  342G:
    id: 342G
    name: methylwyosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.</p>
      <p>Phylogenetic distribution<ul><li>archaea tRNA</li></ul></p>
    synonyms:
    - mimG
    - ∑
    identifiers:
    - ns: modomics.new_nomenclature
      id: 342G
    - ns: cas
      id: 108274-04-0
    - ns: modomics.short_name
      id: mimG
    - ns: rnamods
      id: '42'
    structure: OC1C(COP(=O)([O-])[O-])OC(C1O)n1cnc2c1n(C)c1nc(c(n1c2=O)C)C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 9
      charge: -1
  34832G:
    id: 34832G
    name: peroxywybutosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Structural characterization was made from the acid-liberated base. A Chemical
      Abstracts registry number was then assigned to the corresponding ribonucleoside.
      Alternate name is wybutoxine. Common name for the corresponding base is peroxy-Y,
      symbol Yr. Initial report in with complete characterization in. Occurrence of
      the peroxy function in the natural nucleoside has been questioned and led to
      the confusing use of Yr as a symbol for the base of hydroxywybutosine in.</p>
      <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - W
    - o2yW
    identifiers:
    - ns: modomics.short_name
      id: o2yW
    - ns: cas
      id: 78355-49-4
    - ns: modomics.new_nomenclature
      id: 34832G
    - ns: rnamods
      id: '38'
    structure: OOC(C(C(=O)OC)NC(=O)OC)Cc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 39
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 42
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 45
      charge: -1
  9U:
    id: 9U
    name: pseudouridine
    comments: <p>The structure of pseudouridine was determined by Yu and Allen from
      material isolated from unfractionated yeast RNA, and was independently reported
      by Cohn in a manuscript submitted eight days later. Leading references to the
      pseudouridine literature can be found in a recent review.</p> <p>Phylogenetic
      distribution<ul><li>archaea tRNA</li><li>bacteria tRNA</li><li>eukarya tRNA</li><li>archaea
      rRNA</li><li>bacteria rRNA</li><li>eukarya rRNA</li><li>bacteria tmRNA</li><li>eukarya
      snRNA</li></ul></p>
    synonyms:
    - '[(2R,3S,4R,5S)-5-(2,4-dioxo-1H-pyrimidin-5-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - PSU
    - pseudouridine-5'-monophosphate
    - (1S)-1,4-anhydro-1-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5-O-phosphono-D-ribitol
    - U
    - P
    - Y
    identifiers:
    - ns: pubchem.compound
      id: '15047'
    - ns: modomics.short_name
      id: Y
    - ns: rnamods
      id: '50'
    - ns: cas
      id: 1445-07-4
    - ns: modomics.new_nomenclature
      id: 9U
    - ns: pdb-ccd
      id: PSU
    structure: O[C@H]1[C@H](O)[C@@H](O[C@H]1c1c[nH]c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  10G:
    id: 10G
    name: queuosine
    comments: <p>Characterization of queuine, the base of queuosine, is reported in.
      Biosynthesis of qeuosine has recently been reviewed.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - Q
    identifiers:
    - ns: cas
      id: 57072-36-3
    - ns: modomics.short_name
      id: QtRNA
    - ns: rnamods
      id: '43'
    - ns: modomics.new_nomenclature
      id: 10G
    structure: OC1[C@@H](O)[C@H](O[C@H]1n1cc(c2c1nc(N)[nH]c2=O)CNC1C=CC(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 5
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 34
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 5
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 37
      charge: -1
  3470G:
    id: 3470G
    name: undermodified hydroxywybutosine
    synonyms:
    - š
    identifiers:
    - ns: modomics.new_nomenclature
      id: 3470G
    - ns: modomics.short_name
      id: OHyWx
    structure: OC(C(C(=O)[O-])[NH3+])Cc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@@H]1O[C@@H]([C@@H](C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 36
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 39
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 36
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 42
      charge: -1
  U:
    id: U
    name: uridine
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5'-uridylic acid
    - uridine-5'-monophosphate
    - U
    identifiers:
    - ns: modomics.short_name
      id: U
    - ns: pdb-ccd
      id: U
    - ns: modomics.new_nomenclature
      id: U
    - ns: pubchem.compound
      id: '6029'
    structure: OC1C(O)C(OC1n1ccc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 4
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 19
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 4
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 22
      charge: -1
  502U:
    id: 502U
    name: uridine 5-oxyacetic acid
    comments: <p>Alternate commonly used symbols are o5U and V.</p> <p>Phylogenetic
      distribution<ul><li>bacteria tRNA</li></ul></p>
    synonyms:
    - cmo5U
    - V
    identifiers:
    - ns: modomics.short_name
      id: cmo5U
    - ns: cas
      id: 28144-25-4
    - ns: modomics.new_nomenclature
      id: 502U
    - ns: pubchem.compound
      id: '193091'
    - ns: rnamods
      id: '64'
    structure: '[O-]C(=O)COc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]'
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  503U:
    id: 503U
    name: uridine 5-oxyacetic acid methyl ester
    comments: <p>Alternate commonly used symbol is mV.</p> <p>Phylogenetic distribution<ul><li>bacteria
      tRNA</li></ul></p>
    synonyms:
    - υ
    - mcmo5U
    identifiers:
    - ns: cas
      id: 66536-81-0
    - ns: modomics.new_nomenclature
      id: 503U
    - ns: pubchem.compound
      id: '191808'
    - ns: rnamods
      id: '65'
    - ns: modomics.short_name
      id: mcmo5U
    structure: COC(=O)COc1cn(c(=O)[nH]c1=O)C1OC(C(C1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  3483G:
    id: 3483G
    name: wybutosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Errata for structure determination of yW are reported in. Alternate commonly
      used name is "Y nucleoside". Commonly used symbol for the corresponding base
      is Y. Structural characterization was made from the acid-liberated base. A Chemical
      Abstracts registry number was then assigned to the corresponding ribonucleoside.</p>
      <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    synonyms:
    - G
    - YYG
    - yW
    - 4-(3-[5-o-phosphonoribofuranosyl]-4,6-dimethyl-8-oxo-4,8-dihydro-3h-1,3,4,5,7a-pentaaza-s-indacen-ylamino-butyric
      acid methyl ester
    - methyl (2S)-4-[3-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-4,6-dimethyl-9-oxo-imidazo[3,2-a]purin-7-yl]-2-(methoxycarbonylamino)butanoate
    - Y
    - 7-{(3S)-4-methoxy-3-[(methoxycarbonyl)amino]-4-oxobutyl}-4,6-dimethyl-3-(5-O-phosphono-beta-D-ribofuranosyl)-3,4-dihydro-9H-imidazo[1,2-a]purin-9-one
    identifiers:
    - ns: pdb-ccd
      id: YYG
    - ns: cas
      id: 55196-46-8
    - ns: modomics.new_nomenclature
      id: 3483G
    - ns: rnamods
      id: '37'
    - ns: modomics.short_name
      id: yW
    structure: COC(=O)[C@@H](NC(=O)OC)CCc1c(C)nc2n1c(=O)c1c(n2C)n(cn1)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 39
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 42
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 39
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 45
      charge: -1
  34G:
    id: 34G
    name: wyosine
    comments: <p>Nomenclature for the yW family of nucleosides is discussed in and.
      Structural characterization was made from the acid-liberated base. A Chemical
      Abstracts registry number was then assigned to the corresponding ribonucleoside.
      Symbol for the corresponding base is Yt.</p> <p>Phylogenetic distribution<ul><li>archaea
      tRNA</li><li>eukarya tRNA</li></ul></p>
    synonyms:
    - €
    - imG
    identifiers:
    - ns: cas
      id: 52662-10-9
    - ns: modomics.new_nomenclature
      id: 34G
    - ns: rnamods
      id: '41'
    - ns: modomics.short_name
      id: imG
    structure: O[C@@H]1[C@H](O)[C@H](O[C@H]1n1cnc2c1n(C)c1n(c2=O)cc(n1)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  OHyW*:
    id: OHyW*
    name: undermodified hydroxywybutosine
    comments: <p>Nomenclature for the yW nucleosides is discussed in and. Structure
      characterization was from the acid-liberated base. A Chemical Abstracts registry
      number was then assigned to the corresponding ribonucleoside. Symbol for the
      corresponding base is Ye.</p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    identifiers:
    - ns: cas
      id: 84270-20-2
    - ns: rnamods
      id: '40'
    structure: OC(C(C(=O)[O-])[NH3+])Cc1c(C)nc2n1c(=O)c1c(n2C)ncn1[C@@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 37
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 40
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 43
      charge: -1
  manQ:
    id: manQ
    name: mannosyl-queuosine
    comments: <p>Symbol Q* is also used for either manQ, galQ, or a mixture of the
      two.</p> <p>Phylogenetic distribution<ul><li>eukarya tRNA</li></ul></p>
    identifiers:
    - ns: rnamods
      id: '46'
    - ns: cas
      id: 60398-20-1
    structure: OC[C@H]1O[C@@H](O[C@@H]2[C@H](C=C[C@@H]2O)NCc2cn(c3c2c(=O)nc([nH]3)N)[C@@H]2O[C@@H]([C@H]([C@H]2O)O)COP(=O)([O-])[O-])[C@H]([C@H]([C@@H]1O)O)O
    base_monomers:
    - 10G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 42
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 45
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 42
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 48
      charge: -1
  10C:
    id: 10C
    name: 4-amino-1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-l-lyxofuranosyl}pyrimidin-2(1h)-one
    synonyms:
    - C
    - 4-amino-1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}pyrimidin-2(1H)-one
    - '[(1R,4R,5R,7S)-5-(4-amino-2-oxo-pyrimidin-1-yl)-7-hydroxy-3,6-dioxabicyclo[2.2.1]heptan-1-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 10C
    structure: Nc1ccn(c(=O)n1)[C@@H]1O[C@]2([C@H]([C@H]1OC2)O)COP(=O)(O)O
    base_monomers:
    - C
  '125':
    id: '125'
    name: 2'-o-fluoroethyl-5-methyl-uridine-5'-monophosphate
    synonyms:
    - '[(2R,3R,4R,5R)-4-(2-fluoroethoxy)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-(2-fluoroethyl)-5-methyluridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: '125'
    structure: FCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  '126':
    id: '126'
    name: 2'-o-methyl-[tri(oxyethyl)]-5-methyl-uridine-5'-monophosphate
    synonyms:
    - '[(2R,3R,4R,5R)-3-hydroxy-4-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-{2-[2-(2-methoxyethoxy)ethoxy]ethyl}-5-methyluridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: '126'
    structure: COCCOCCOCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 16
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 34
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 37
      charge: -1
  '127':
    id: '127'
    name: 2'-o-aminooxy-ethyl-5-methyl-uridine-5'-monophosphate
    synonyms:
    - '[(2R,3R,4R,5R)-4-(2-aminooxyethoxy)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-[2-(aminooxy)ethyl]-5-methyluridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: '127'
    structure: NOCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  18M:
    id: 18M
    name: 2'-o-methylguanosine 3',5'-bis(dihydrogen phosphate)
    synonyms:
    - '[(2R,3R,4R,5R)-5-(2-azanyl-6-oxidanylidene-3H-purin-9-yl)-4-methoxy-2-(phosphonooxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    - 2'-O-methylguanosine 3',5'-bis(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 18M
    structure: CO[C@@H]1[C@@H](OP(=O)(O)O)[C@@H](O[C@@H]1n1cnc2c1[nH]c(N)nc2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 31
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  1DP:
    id: 1DP
    name: n1-deaza-adenosine-5'-monophosphate
    synonyms:
    - 3-(5-O-phosphono-beta-D-ribofuranosyl)-3H-imidazo[4,5-b]pyridin-7-amine
    - '[(2R,3S,4R,5R)-5-(7-aminoimidazo[5,4-b]pyridin-3-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 1DP
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@@H]1n1cnc2c1nccc2N)COP(=O)(O)O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  1PR:
    id: 1PR
    name: phosphoric acid mono-[5-({[5-carbamoyl-3-(5-phosphonooxy-5-deoxy-ribofuranosyl)-
      3h-imidazol-4-ylamino]-methyl}-amino)-2,3,4-trihydroxy-pentyl] ester
    synonyms:
    - '[(2R,3S)-5-[[[5-aminocarbonyl-3-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]imidazol-4-yl]amino]methylamino]-2,3,4-trihydroxy-pentyl]
      dihydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: 1PR
    structure: O[C@H]([C@@H](COP(=O)(O)O)O)[C@H](CNCNc1n(cnc1C(=O)N)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(O)O)O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 37
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 37
  1RN:
    id: 1RN
    name: (e)-n-{[4-oxo-1-(5-o-phosphono-beta-d-arabinofuranosyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl]methylidene}glycine
    synonyms:
    - (E)-N-{[4-oxo-1-(5-O-phosphono-beta-D-arabinofuranosyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl]methylidene}glycine
    - 2-[(E)-[1-[(2R,3S,4S,5R)-3,4-bis(oxidanyl)-5-(phosphonooxymethyl)oxolan-2-yl]-4-oxidanylidene-2-sulfanylidene-pyrimidin-5-yl]methylideneamino]ethanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: 1RN
    structure: OC(=O)C/N=C/c1cn(c(=S)[nH]c1=O)[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - U
  1SC:
    id: 1SC
    name: 5'-o-thiophosphonocytidine
    synonyms:
    - C
    - '[(2R,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    - 5'-O-thiophosphonocytidine
    identifiers:
    - ns: pdb-ccd
      id: 1SC
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(nc1=O)N)CO[P@@](=O)(S)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  23G:
    id: 23G
    name: guanosine-5'-phosphate-2',3'-cyclic phosphate
    synonyms:
    - '[(2S,3aR,4R,6R,6aR)-6-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-2-hydroxy-2-oxidotetrahydrofuro[3,4-d][1,3,2]dioxaphosphol-4-yl]methyl
      dihydrogen phosphate'
    - '[(1R,3S,5R,6R,8R)-8-(2-azanyl-6-oxo-1H-purin-9-yl)-3-hydroxy-3-oxo-2,4,7-trioxa-3$l^{5}-phosphabicyclo[3.3.0]octan-6-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 23G
    structure: Nc1[nH]c(=O)c2c(n1)n(cn2)[C@@H]1O[C@H]([C@H]2[C@@H]1O[P@@](=O)(O2)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  2AT:
    id: 2AT
    name: 2'-o-allyl thymidine-5'-monophosphate
    synonyms:
    - 5-methyl-2'-O-prop-2-en-1-yluridine 5'-(dihydrogen phosphate)
    - T
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-4-prop-2-enoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 2AT
    structure: C=CCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  2AU:
    id: 2AU
    name: 2'-aminouridine
    synonyms:
    - '[(2R,3S,4R,5R)-4-amino-5-(2,4-dioxopyrimidin-1-yl)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-amino-2'-deoxyuridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: 2AU
    structure: N[C@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  2BT:
    id: 2BT
    name: 2'-o-butyl-thymidine
    synonyms:
    - '[(2R,3R,4R,5R)-4-butoxy-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - T
    - 2'-O-butyl-5-methyluridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 2BT
    structure: CCCCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  2GT:
    id: 2GT
    name: 2'-o-propargyl thymidine-5'-monophosphate
    synonyms:
    - T
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-4-prop-2-ynoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-methyl-2'-O-prop-2-yn-1-yluridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 2GT
    structure: C#CCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  2MA:
    id: 2MA
    name: 2-methyladenosine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-imino-2-methyl-1H-purin-9-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - A
    - 2-methyladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 2MA
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(C)[nH]c2=N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  2NT:
    id: 2NT
    name: 2'-o-[2-[hydroxy(methyleneamino)oxy]ethyl thymidine-5'-monophosphate
    synonyms:
    - 2'-O-(2-{[(hydroxymethyl)amino]oxy}ethyl)-5-methyluridine 5'-(dihydrogen phosphate)
    - T
    - '[(2R,3R,4R,5R)-3-hydroxy-4-[2-(hydroxymethylamino)oxyethoxy]-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 2NT
    structure: OCNOCCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 12
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  2OM:
    id: 2OM
    name: 5,6-dihydroorotidine 5'-monophosphate
    synonyms:
    - (4R)-3-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-2,6-dioxo-1,3-diazinane-4-carboxylic
      acid
    - 6-carboxyuridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: 2OM
    structure: O=C1NC(=O)N([C@@H](C1)C(=O)O)[C@H]1O[C@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  2OT:
    id: 2OT
    name: 2'-o-[2-(n,n-dimethylaminooxy)ethyl] thymidine-5'-monophosphate
    synonyms:
    - 2'-O-{2-[(dimethylamino)oxy]ethyl}-5-methyluridine 5'-(dihydrogen phosphate)
    - T
    - '[(2R,3R,4R,5R)-4-(2-dimethylaminooxyethoxy)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 2OT
    structure: CN(OCCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-])C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 11
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 29
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 11
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  2SA:
    id: 2SA
    name: 2-[9-(3,4-dihydroxy-5-phosphonooxymethyl-tetrahydro-furan-2-yl)-9h-purin-6-ylamino]-succinic
      acid
    synonyms:
    - (2S)-2-[(9-{(2R,3R,4S,5R)-3,4-dihydroxy-5-[(phosphonooxy)methyl]tetrahydrofuran-2-yl}-9H-purin-6-yl)amino]butanedioic
      acid (non-preferred name)
    - (2S)-2-[[9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]purin-6-yl]amino]butanedioic
      acid
    - N
    identifiers:
    - ns: pdb-ccd
      id: 2SA
    structure: OC(=O)C[C@H](C(=O)O)Nc1ncnc2c1ncn2[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
  2SG:
    id: 2SG
    name: guanosine phosphorodithioate
    synonyms:
    - 2-azanyl-9-[(2R,3R,4S,5R)-3,4-bis(oxidanyl)-5-[[oxidanyl-bis(sulfanyl)-$l^{5}-phosphanyl]oxymethyl]oxolan-2-yl]-1H-purin-6-one
    - 5'-O-[hydroxy(disulfanyl)-lambda~5~-phosphanyl]guanosine
    identifiers:
    - ns: pdb-ccd
      id: 2SG
    structure: O[C@H]1[C@H](O)[C@H](O[C@H]1n1cnc2c1nc(N)[nH]c2=O)COP(S)(S)O
    base_monomers:
    - G
  31H:
    id: 31H
    name: 3'-deoxy-3'-[(n-formyl-l-methionyl)amino]adenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3-[[(2S)-2-formamido-4-methylsulfanyl-butanoyl]amino]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-3'-[(N-formyl-L-methionyl)amino]adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 31H
    structure: CSCC[C@H](C(=O)N[C@@H]1[C@H](COP(=O)([O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1ncnc2N)NC=O
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 16
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 19
      charge: -1
  31M:
    id: 31M
    name: 3'-deoxy-3'-[(l-methionyl-l-phenylalanyl)amino]adenosine 5'-(dihydrogen
      phosphate)
    synonyms:
    - '[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3-[[(2S)-2-[[(2S)-2-azanyl-4-methylsulfanyl-butanoyl]amino]-3-phenyl-propanoyl]amino]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-3'-[(L-methionyl-L-phenylalanyl)amino]adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 31M
    structure: CSCC[C@H](C(=O)N[C@H](C(=O)N[C@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1ncnc2N)Cc1ccccc1)N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  3AU:
    id: 3AU
    name: 3-[(3s)-3-amino-3-carboxypropyl]uridine 5'-(dihydrogen phosphate)
    synonyms:
    - (2S)-2-azanyl-4-[3-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-2,6-dioxo-pyrimidin-1-yl]butanoic
      acid
    - 3-[(3S)-3-amino-3-carboxypropyl]uridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 3AU
    structure: OC(=O)[C@H](CCn1c(=O)ccn(c1=O)[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O)N
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 26
  3DA:
    id: 3DA
    name: 3'-deoxyadenosine-5'-monophosphate
    synonyms:
    - A
    - '[(2S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-oxolan-2-yl]methyl dihydrogen phosphate'
    - 3'-deoxy-5'-adenylic acid
    identifiers:
    - ns: pdb-ccd
      id: 3DA
    structure: O[C@H]1C[C@H](O[C@H]1n1cnc2c1ncnc2N)COP(=O)(O)O
  3ME:
    id: 3ME
    name: 2'-o-{2-[2-(dimethylamino)ethoxy]ethyl}-5-methyluridine 5'-(dihydrogen phosphate)
    synonyms:
    - 2'-O-{2-[2-(dimethylamino)ethoxy]ethyl}-5-methyluridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-4-[2-(2-dimethylaminoethyloxy)ethoxy]-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: 3ME
    structure: CN(CCOCCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O)C
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 13
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 13
  3TD:
    id: 3TD
    name: (1s)-1,4-anhydro-1-(3-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5-o-phosphono-d-ribitol
    synonyms:
    - (1S)-1,4-anhydro-1-(3-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5-O-phosphono-D-ribitol
    - '[(2R,3S,4R,5S)-5-[3-methyl-2,4-bis(oxidanylidene)-1H-pyrimidin-5-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 3TD
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@H]1c1c[nH]c(=O)n(c1=O)C)COP(=O)(O)O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  45A:
    id: 45A
    name: 5'-o-[(s)-hydroxy(methyl)phosphoryl]adenosine
    synonyms:
    - A
    - 5'-O-[(S)-hydroxy(methyl)phosphoryl]adenosine
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-methyl-phosphinic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: 45A
    structure: O[C@@H]1[C@@H](O)[C@@H](O[C@H]1n1cnc2c1ncnc2N)CO[P@](=O)(O)C
    base_monomers:
    - A
  4TA:
    id: 4TA
    name: p1-(5'-adenosyl)p4-(5'-(2'-deoxy-thymidyl))tetraphosphate
    synonyms:
    - '[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanidyl-phosphoryl]
      [[[(2R,3S,5R)-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methoxy-oxidanidyl-phosphoryl]oxy-oxidanidyl-phosphoryl]
      phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: 4TA
    structure: O[C@@H]1C[C@@H](O[C@@H]1CO[P@@](=O)(O[P@@](=O)(O[P@@](=O)(O[P@@](=O)(OC[C@H]1O[C@@H]([C@H]([C@H]1O)O)n1cnc2c1ncnc2N)[O-])[O-])[O-])[O-])n1cc(C)c(=O)[nH]c1=O
  50L:
    id: 50L
    name: '[(2r,3s,4r,5r)-5-(4-azanyl-2-oxidanylidene-1$l^{4},3,5,7-tetrazabicyclo[4.3.0]nona-1(6),3,8-trien-7-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(2R,3S,4R,5R)-5-(4-azanyl-2-oxidanylidene-1$l^{4},3,5,7-tetrazabicyclo[4.3.0]nona-1(6),3,8-trien-7-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 50L
    structure: NC1NC(=O)N2C(N1)N(CC2)[C@@H]1O[C@@H]([C@@H]([C@H]1O)O)COP(=O)(O)O
  50N:
    id: 50N
    name: (1s)-1-(6-amino-2-hydroxy-5-nitropyridin-3-yl)-1,4-anhydro-5-o-phosphono-d-ribitol
    synonyms:
    - (1S)-1-(6-amino-2-hydroxy-5-nitropyridin-3-yl)-1,4-anhydro-5-O-phosphono-D-ribitol
    - '[(2R,3S,4R,5S)-5-(6-azanyl-5-nitro-2-oxidanyl-pyridin-3-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 50N
    structure: O[C@H]1[C@H](O)[C@H](O[C@H]1c1cc([N+](=O)[O-])c(nc1O)N)COP(=O)([O-])[O-]
  56B:
    id: 56B
    name: 2-amino-5-({[(1s,4s,5r)-4,5-dihydroxycyclopent-2-en-1-yl]amino}methyl)-7-(5-o-phosphono-beta-d-ribofuranosyl)-3,7-dihydro-4h-pyrrolo[2,3-d]pyrimidin-4-one
    synonyms:
    - 2-amino-5-({[(1S,4S,5R)-4,5-dihydroxycyclopent-2-en-1-yl]amino}methyl)-7-(5-O-phosphono-beta-D-ribofuranosyl)-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one
    - '[(2R,3S,4R,5R)-5-[2-azanyl-5-[[[(1S,4S,5R)-4,5-bis(oxidanyl)cyclopent-2-en-1-yl]amino]methyl]-4-oxidanylidene-3H-pyrrolo[2,3-d]pyrimidin-7-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 56B
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(c2c1nc(N)[nH]c2=O)CN[C@H]1C=C[C@H]([C@@H]1O)O)CO[P@@](=O)(O)[O-]
  '574':
    id: '574'
    name: '[(3as,4r,6r,6ar)-2-{2-[(1s)-2-amino-1-hydroxyethyl]phenyl}-6-(6-amino-9h-purin-9-yl)tetrahydrofuro[3,4-d][1,3,2]dioxaborol-4-yl]methyl
      dihydrogen phosphite'
    synonyms:
    - '[(3aR,4R,6R,6aS)-4-(6-aminopurin-9-yl)-2-[2-[(1S)-2-azanyl-1-oxidanyl-ethyl]phenyl]-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxaborol-6-yl]methyl
      dihydrogen phosphate'
    - '[(3aS,4R,6R,6aR)-2-{2-[(1S)-2-amino-1-hydroxyethyl]phenyl}-6-(6-amino-9H-purin-9-yl)tetrahydrofuro[3,4-d][1,3,2]dioxaborol-4-yl]methyl
      dihydrogen phosphite'
    identifiers:
    - ns: pdb-ccd
      id: '574'
    structure: NC[C@H](c1ccccc1B1O[C@H]2[C@H](O1)[C@@H](O[C@@H]2n1cnc2c1ncnc2N)COP(=O)(O)O)O
  5AA:
    id: 5AA
    name: n6-dimethyl-3'-amino-adenosine-5'-monophosphate
    synonyms:
    - A
    - 3'-amino-3'-deoxy-N,N-dimethyladenosine 5'-(dihydrogen phosphate)
    - '[(2S,3S,4R,5R)-3-amino-5-(6-dimethylaminopurin-9-yl)-4-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 5AA
    structure: O[C@H]1[C@@H](N)[C@H](O[C@H]1n1cnc2c1ncnc2N(C)C)COP(=O)([O-])[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  5BU:
    id: 5BU
    name: 5-bromo-uridine-5'-monophosphate
    synonyms:
    - 5-bromouridine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(5-bromo-2,4-dioxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: 5BU
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(Br)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  5CF:
    id: 5CF
    name: 5-fluorocytidine 5'-(dihydrogen phosphate)
    synonyms:
    - 5-fluorocytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-azanyl-5-fluoro-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 5CF
    structure: O[C@@H]1[C@@H](O)[C@H](O[C@H]1n1cc(F)c(nc1=O)N)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  5CG:
    id: 5CG
    name: 5'-chloro-5'-deoxy-guanosine
    synonyms:
    - 2-amino-9-[(2R,3R,4S,5S)-5-(chloromethyl)-3,4-dihydroxy-oxolan-2-yl]-1H-purin-6-one
    - G
    - 5'-chloro-5'-deoxyguanosine
    identifiers:
    - ns: pdb-ccd
      id: 5CG
    structure: ClC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cnc2c1nc(N)[nH]c2=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  5FA:
    id: 5FA
    name: adenosine-5'-pentaphosphate
    synonyms:
    - A
    - 5'-O-[(S)-hydroxy{[(R)-hydroxy{[(R)-hydroxy{[(S)-hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl]oxy}phosphoryl]oxy}phosphoryl]adenosine
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl [hydroxy-[hydroxy-(hydroxy-phosphonooxy-phosphoryl)oxy-phosphoryl]oxy-phosphoryl]
      hydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 5FA
    structure: O[C@@H]1[C@@H](CO[P@](=O)(O[P@](=O)(O[P@](=O)(O[P@](=O)(OP(=O)(O)O)O)O)O)O)O[C@@H]([C@@H]1O)n1cnc2c1ncnc2N
    base_monomers:
    - A
  5FU:
    id: 5FU
    name: 5-fluoro-uridine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(5-fluoro-2,4-dioxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-fluorouridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: 5FU
    structure: O[C@@H]1[C@@H](O)[C@@H](O[C@@H]1n1cc(F)c(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
  5HM:
    id: 5HM
    name: 5-(hydroxymethyl)cytidine 5'-(dihydrogen phosphate)
    synonyms:
    - 5-(hydroxymethyl)cytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-[4-azanyl-5-(hydroxymethyl)-2-oxidanylidene-pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 5HM
    structure: OCc1cn(c(=O)nc1N)[C@H]1O[C@H]([C@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 21
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 21
  5IC:
    id: 5IC
    name: 5-iodo-cytidine-5'-monophosphate
    synonyms:
    - C
    - 4-amino-5-iodo-1-(5-O-phosphono-beta-D-arabinofuranosyl)pyrimidin-2(1H)-one
    - '[(2R,3S,4S,5R)-5-(4-amino-5-iodo-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 5IC
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@H]1n1cc(I)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  5JO:
    id: 5JO
    name: 2'-o-prop-2-yn-1-yladenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-3-oxidanyl-4-prop-2-ynoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-prop-2-yn-1-yladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 5JO
    structure: C#CCO[C@@H]1[C@H](O)[C@H](O[C@H]1n1cnc2c1ncnc2N)COP(=O)(O)O
  6F7:
    id: 6F7
    name: 3'-deoxy-5-methyluridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2~{S},4~{R},5~{R})-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-5-methyluridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 6F7
    structure: O[C@@H]1C[C@@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O
  6FC:
    id: 6FC
    name: 2'-trifluoromethylthio-2'-deoxycytidine
    synonyms:
    - 4-azanyl-1-[(2R,3R,4R,5R)-4-oxidanyl-3-(trifluoromethylsulfanyl)-5-[[tris(oxidanyl)-$l^{5}-phosphanyl]oxymethyl]oxolan-2-yl]pyrimidin-2-one
    - 2'-thio-2'-S-(trifluoromethyl)-5'-O-(trihydroxy-lambda~5~-phosphanyl)cytidine
    identifiers:
    - ns: pdb-ccd
      id: 6FC
    structure: O[C@@H]1[C@H](COP(O)(O)O)O[C@H]([C@@H]1SC(F)(F)F)n1ccc(nc1=O)N
  6FU:
    id: 6FU
    name: 2'-trifluoromethylthio-2'-deoxyuridine
    synonyms:
    - 1-[(2R,3R,4R,5R)-4-oxidanyl-3-(trifluoromethylsulfanyl)-5-[[tris(oxidanyl)-$l^{5}-phosphanyl]oxymethyl]oxolan-2-yl]pyrimidine-2,4-dione
    - 2'-thio-2'-S-(trifluoromethyl)-5'-O-(trihydroxy-lambda~5~-phosphanyl)uridine
    identifiers:
    - ns: pdb-ccd
      id: 6FU
    structure: O[C@H]1[C@@H](COP(O)(O)O)O[C@H]([C@@H]1SC(F)(F)F)n1ccc(=O)[nH]c1=O
  6IA:
    id: 6IA
    name: n6-isopentenyl-adenosine-5'-monophosphate
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-[6-(3-methylbutylamino)purin-9-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N-(3-methylbutyl)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 6IA
    structure: CC(CCNc1ncnc2c1ncn2[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-])C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 25
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  6MZ:
    id: 6MZ
    name: n6-methyladenosine-5'-monophosphate
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-[6-(methylamino)purin-9-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N-methyladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 6MZ
    structure: CNc1ncnc2c1ncn2[C@@H]1O[C@H]([C@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - A
  6NW:
    id: 6NW
    name: 2'-o-methyl-5'-o-thiophosphonoadenosine
    synonyms:
    - 2'-O-methyl-5'-O-thiophosphonoadenosine
    - '[(2~{R},3~{R},4~{R},5~{R})-5-(6-aminopurin-9-yl)-4-methoxy-3-oxidanyl-oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: 6NW
    structure: CO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)CO[P@](=O)(S)[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
  6OO:
    id: 6OO
    name: 2'-o-methyl-5'-o-thiophosphonocytidine
    synonyms:
    - '[(2~{R},3~{R},4~{R},5~{R})-5-(4-azanyl-2-oxidanylidene-pyrimidin-1-yl)-4-methoxy-3-oxidanyl-oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: 6OO
    structure: CO[C@H]1[C@H](O)[C@H](O[C@H]1n1ccc(nc1=O)N)CO[P@@](=O)(S)O
    base_monomers:
    - C
  6OP:
    id: 6OP
    name: 1-[(5e)-5,6-dideoxy-2-o-(2-methoxyethyl)-6-phosphono-beta-d-ribo-hex-5-enofuranosyl]-5-methylpyrimidine-2,4(1h,3h)-dione
    synonyms:
    - '[(~{E})-2-[(2~{R},3~{R},4~{R},5~{R})-4-(2-methoxyethoxy)-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]ethenyl]phosphonic
      acid'
    - 1-[(5E)-5,6-dideoxy-2-O-(2-methoxyethyl)-6-phosphono-beta-D-ribo-hex-5-enofuranosyl]-5-methylpyrimidine-2,4(1H,3H)-dione
    identifiers:
    - ns: pdb-ccd
      id: 6OP
    structure: COCCO[C@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)/C=C/[P@@](=O)(O)[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
  73W:
    id: 73W
    name: 5'-o-[(dithiophosphono)]cytidine
    synonyms:
    - 5'-O-[(dithiophosphono)]cytidine
    - 4-azanyl-1-[(2~{R},3~{R},4~{S},5~{R})-3,4-bis(oxidanyl)-5-[[oxidanyl(sulfanyl)phosphinothioyl]oxymethyl]oxolan-2-yl]pyrimidin-2-one
    identifiers:
    - ns: pdb-ccd
      id: 73W
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@H]1n1ccc(nc1=O)N)CO[P@@](=S)(S)O
    base_monomers:
    - C
  75B:
    id: 75B
    name: 5-selenophen-2-yluridine 5'-(dihydrogen phosphate)
    synonyms:
    - 5-selenophen-2-yluridine 5'-(dihydrogen phosphate)
    - '[(2~{R},3~{S},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)-5-selenophen-2-yl-pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 75B
    structure: O[C@H]1[C@H](O)[C@H](O[C@H]1n1cc(c2ccc[se]2)c(=O)[nH]c1=O)CO[P@](=O)(O)[O-]
    base_monomers:
    - U
  7AT:
    id: 7AT
    name: 1-(5-o-phosphono-beta-d-ribofuranosyl)-3-(1h-1,2,3-triazol-5-yl)-1h-pyrazolo[3,4-d]pyrimidin-4-amine
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-[4-azanyl-3-(1H-1,2,3-triazol-5-yl)pyrazolo[3,4-d]pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-3-(1H-1,2,3-triazol-5-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine
    identifiers:
    - ns: pdb-ccd
      id: 7AT
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1nc(c2c1ncnc2N)c1cnn[nH]1)CO[P@](=O)(O)[O-]
    base_monomers:
    - A
  7MG:
    id: 7MG
    name: 7n-methyl-8-hydroguanosine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2-amino-7-methyl-6-oxo-1,8-dihydropurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    - 7-methylguanosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 7MG
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1N1CN(c2c1nc(N)[nH]c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  85Y:
    id: 85Y
    name: 2'-deoxy-5-{[(naphthalen-2-yl)methyl]carbamoyl}uridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2~{R},3~{S},5~{R})-5-[5-(naphthalen-2-ylmethylcarbamoyl)-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-deoxy-5-{[(naphthalen-2-yl)methyl]carbamoyl}uridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: 85Y
    structure: O[C@@H]1C[C@@H](O[C@H]1COP(=O)([O-])[O-])n1cc(C(=O)NCc2ccc3c(c2)cccc3)c(=O)[nH]c1=O
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 15
      charge: -1
  8AN:
    id: 8AN
    name: 3'-amino-3'-deoxyadenosine 5'-(dihydrogen phosphate)
    synonyms:
    - A
    - 3'-amino-3'-deoxyadenosine 5'-(dihydrogen phosphate)
    - '[(2S,3S,4R,5R)-3-amino-5-(6-aminopurin-9-yl)-4-hydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 8AN
    structure: N[C@H]1[C@@H](COP(=O)(O)O)O[C@@H]([C@H]1O)n1cnc2c1ncnc2N
    base_monomers:
    - A
  8AZ:
    id: 8AZ
    name: 8-aza-nebularine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-3,4-bis(oxidanyl)-5-[(7~{R})-7-oxidanyl-6,7-dihydro-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 8AZ
    structure: O[C@H]1[C@H](O)[C@H](O[C@@H]1n1nnc2c1N=CN[C@H]2O)COP(=O)(O)O
  8OS:
    id: 8OS
    name: 5'-o-[(s)-hydroxy(4-methyl-1h-imidazol-5-yl)phosphoryl]guanosine
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-oxidanylidene-1~{H}-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-(4-methyl-1~{H}-imidazol-5-yl)phosphinic
      acid'
    - 5'-O-[(S)-hydroxy(4-methyl-1H-imidazol-5-yl)phosphoryl]guanosine
    identifiers:
    - ns: pdb-ccd
      id: 8OS
    structure: O[C@H]1[C@H](CO[P@@](=O)(c2[nH]cnc2C)O)O[C@@H]([C@@H]1O)n1cnc2c1nc(N)[nH]c2=O
    base_monomers:
    - G
  8RJ:
    id: 8RJ
    name: (r)-1'-(2',3'-dihydroxypropyl)-thymine
    synonyms:
    - (2R)-2-hydroxy-3-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)propyl dihydrogen
      phosphate
    - '[(2~{R})-3-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-2-oxidanyl-propyl]
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 8RJ
    structure: O[C@@H](Cn1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 17
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 20
      charge: -1
  9QV:
    id: 9QV
    name: uridine 2',5'-bis(dihydrogen phosphate)
    synonyms:
    - uridine 2',5'-bis(dihydrogen phosphate)
    - '[(2~{R},3~{R},4~{R},5~{R})-2-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-oxidanyl-5-(phosphonooxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: 9QV
    structure: O[C@@H]1[C@@H](COP(=O)(O)O)O[C@@H]([C@H]1OP(=O)(O)O)n1ccc(=O)[nH]c1=O
    base_monomers:
    - U
  A23:
    id: A23
    name: adenosine-5'-phosphate-2',3'-cyclic phosphate
    synonyms:
    - A
    - '[(2S,3aR,4R,6R,6aR)-6-(6-amino-9H-purin-9-yl)-2-hydroxy-2-oxidotetrahydrofuro[3,4-d][1,3,2]dioxaphosphol-4-yl]methyl
      dihydrogen phosphate'
    - '[(1R,3S,5R,6R,8R)-6-(6-aminopurin-9-yl)-3-hydroxy-3-oxo-2,4,7-trioxa-3$l^{5}-phosphabicyclo[3.3.0]octan-8-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A23
    structure: Nc1ncnc2c1ncn2[C@H]1O[C@@H]([C@@H]2[C@H]1O[P@@](=O)(O2)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  A2L:
    id: A2L
    name: 3'-o-methyoxyethyl-adenosine 5'-monophosphate
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-3-(2-methoxyethoxy)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-O-(2-methoxyethyl)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: A2L
    structure: COCCO[C@@H]1[C@H](COP(=O)([O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1ncnc2N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  A3P:
    id: A3P
    name: adenosine-3'-5'-diphosphate
    synonyms:
    - A
    - adenosine 3',5'-bis(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-2-(phosphonooxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A3P
    structure: O[C@@H]1[C@H](OP(=O)(O)O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=O)(O)O
    base_monomers:
    - A
  A44:
    id: A44
    name: 2'-o-methyoxyethyl-adenosine 5'-monophosphate
    synonyms:
    - A
    - 2'-O-(2-methoxyethyl)adenosine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-4-(2-methoxyethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A44
    structure: COCCO[C@@H]1[C@@H](O)[C@@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  A5M:
    id: A5M
    name: 2'-amine-cytidine-5'-monophosphate
    synonyms:
    - C
    - 2'-amino-2'-deoxycytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-4-amino-5-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A5M
    structure: N[C@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  A5O:
    id: A5O
    name: adenine arabinose-5'-phosphate
    synonyms:
    - A
    - 9-(5-O-phosphono-beta-D-arabinofuranosyl)-9H-purin-6-amine
    - '[(2R,3S,4S,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A5O
    structure: O[C@@H]1[C@@H](O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  A6A:
    id: A6A
    name: 2-(6-amino-9h-purin-9-yl)-1,5-anhydro-2-deoxy-6-o-phosphono-d-altritol
    synonyms:
    - 2-(6-amino-9H-purin-9-yl)-1,5-anhydro-2-deoxy-6-O-phosphono-D-altritol
    - '[(2R,3S,4S,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxan-2-yl]methyl dihydrogen
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A6A
    structure: O[C@@H]1[C@@H](O)[C@H](OC[C@H]1n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  A6C:
    id: A6C
    name: 2-(4-amino-2-oxopyrimidin-1(2h)-yl)-1,5-anhydro-2-deoxy-6-o-phosphono-d-altritol
    synonyms:
    - '[(2R,3S,4S,5R)-5-(4-azanyl-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxan-2-yl]methyl
      dihydrogen phosphate'
    - 2-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,5-anhydro-2-deoxy-6-O-phosphono-D-altritol
    identifiers:
    - ns: pdb-ccd
      id: A6C
    structure: O[C@@H]1[C@@H](O)[C@H](OC[C@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  A6G:
    id: A6G
    name: 2-(2-amino-6-oxo-1,6-dihydro-9h-purin-9-yl)-1,5-anhydro-2-deoxy-6-o-phosphono-d-altritol
    synonyms:
    - '[(2R,3S,4S,5R)-5-(2-azanyl-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxan-2-yl]methyl
      dihydrogen phosphate'
    - 2-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-1,5-anhydro-2-deoxy-6-O-phosphono-D-altritol
    identifiers:
    - ns: pdb-ccd
      id: A6G
    structure: O[C@@H]1[C@@H](O)[C@H](OC[C@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  A6U:
    id: A6U
    name: 1,5-anhydro-2-deoxy-2-(2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-6-o-phosphono-d-altritol
    synonyms:
    - '[(2R,3S,4S,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxan-2-yl]methyl dihydrogen
      phosphate'
    - 1,5-anhydro-2-deoxy-2-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-6-O-phosphono-D-altritol
    identifiers:
    - ns: pdb-ccd
      id: A6U
    structure: O[C@@H]1[C@@H](O)[C@H](OC[C@H]1n1ccc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  A7C:
    id: A7C
    name: 3-[1-(4-bromophenyl)-1h-1,2,3-triazol-4-yl]-1-[5-o-(trihydroxy-lambda~5~-phosphanyl)-beta-d-ribofuranosyl]-1h-pyrazolo[3,4-d]pyrimidin-4-amine
    synonyms:
    - (2~{R},3~{R},4~{S},5~{R})-2-[4-azanyl-3-[1-(4-bromophenyl)-1,2,3-triazol-4-yl]pyrazolo[3,4-d]pyrimidin-1-yl]-5-[[tris(oxidanyl)-$l^{5}-phosphanyl]oxymethyl]oxolane-3,4-diol
    - 3-[1-(4-bromophenyl)-1H-1,2,3-triazol-4-yl]-1-[5-O-(trihydroxy-lambda~5~-phosphanyl)-beta-D-ribofuranosyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine
    identifiers:
    - ns: pdb-ccd
      id: A7C
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1nc(c2c1ncnc2N)c1nnn(c1)c1ccc(cc1)Br)COP(O)(O)O
  A7E:
    id: A7E
    name: 3-ethynyl-1-(5-o-phosphono-beta-d-ribofuranosyl)-1h-pyrazolo[3,4-d]pyrimidin-4-amine
    synonyms:
    - A
    - 3-ethynyl-1-(5-O-phosphono-beta-D-ribofuranosyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine
    - '[(2R,3S,4R,5R)-5-(4-azanyl-3-ethynyl-pyrazolo[3,4-d]pyrimidin-1-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A7E
    structure: C#Cc1nn(c2c1c(N)ncn2)[C@H]1O[C@@H]([C@H]([C@H]1O)O)CO[P@](=O)(O)[O-]
    base_monomers:
    - A
  A9Z:
    id: A9Z
    name: 2'-deoxy-2'-(4-ethyl-1h-1,2,3-triazol-1-yl)adenosine 5'-(dihydrogen phosphate)
    synonyms:
    - 2'-deoxy-2'-(4-ethyl-1H-1,2,3-triazol-1-yl)adenosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-(4-ethyl-1,2,3-triazol-1-yl)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: A9Z
    structure: CCc1nnn(c1)[C@@H]1[C@@H](O)[C@H](O[C@H]1n1cnc2c1ncnc2N)COP(=O)(O)O
    base_monomers:
    - A
  ADX:
    id: ADX
    name: adenosine-5'-phosphosulfate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl sulfo
      hydrogen phosphate'
    - 5'-O-[(S)-hydroxy(sulfooxy)phosphoryl]adenosine
    - N
    identifiers:
    - ns: pdb-ccd
      id: ADX
    structure: O[C@@H]1[C@@H](CO[P@@](=O)(OS(=O)(=O)O)O)O[C@@H]([C@@H]1O)n1cnc2c1ncnc2N
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  AP7:
    id: AP7
    name: n1-protonated adenosine-5'-monophosphate
    synonyms:
    - A
    - '[(2R,3S,4R,5R)-5-(6-azanylpurin-1-ium-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5'-adenylic acid
    identifiers:
    - ns: pdb-ccd
      id: AP7
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@H]1n1cnc2c1nc[nH+]c2N)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  ATL:
    id: ATL
    name: '[(1s,3r,4s,7r)-7-hydroxy-3-(thymin-1-yl)-2,5-dioxabicyclo[2.2.1]hept-1-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(1S,4S,5R,7R)-7-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-3,6-dioxabicyclo[2.2.1]heptan-1-yl]methyl
      dihydrogen phosphate'
    - T
    - 1-{2,5-anhydro-4-[(phosphonooxy)methyl]-beta-D-lyxofuranosyl}-5-methylpyrimidine-2,4(1H,3H)-dione
    identifiers:
    - ns: pdb-ccd
      id: ATL
    structure: O[C@H]1[C@H]2OC[C@]1(COP(=O)(O)O)O[C@@H]2n1cc(C)c(=O)[nH]c1=O
  B8H:
    id: B8H
    name: '[(2~{r},3~{s},4~{r},5~{s})-5-[1-methyl-2,4-bis(oxidanylidene)pyrimidin-5-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{S})-5-[1-methyl-2,4-bis(oxidanylidene)pyrimidin-5-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: B8H
    structure: O[C@H]1[C@H](O)[C@H](O[C@@H]1c1cn(C)c(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
  B8K:
    id: B8K
    name: 7-acetyl, guanosine-5'-monophosphate
    synonyms:
    - G
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-7-ethanoyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: B8K
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1N1CN(c2c1nc(N)[nH]c2=O)C(=O)C)COP(=O)(O)O
    base_monomers:
    - G
  B8N:
    id: B8N
    name: (2~{r})-2-azanyl-4-[5-[(2~{s},3~{r},4~{s},5~{r})-3,4-bis(oxidanyl)-5-(phosphonooxymethyl)oxolan-2-yl]-3-methyl-2,6-bis(oxidanylidene)pyrimidin-1-yl]butanoic
      acid
    synonyms:
    - (2~{R})-2-azanyl-4-[5-[(2~{S},3~{R},4~{S},5~{R})-3,4-bis(oxidanyl)-5-(phosphonooxymethyl)oxolan-2-yl]-3-methyl-2,6-bis(oxidanylidene)pyrimidin-1-yl]butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: B8N
    structure: OC(=O)[C@H](CCn1c(=O)c(cn(c1=O)C)[C@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)(O)O)N
  B8Q:
    id: B8Q
    name: 3-methyl, cytidine-5'-monophosphate
    synonyms:
    - C
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(4-azanyl-3-methyl-2-oxidanylidene-4~{H}-pyrimidin-1-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: B8Q
    structure: O[C@@H]1[C@@H](O)[C@@H](O[C@H]1N1C=C[C@@H](N(C1=O)C)N)COP(=O)(O)O
    base_monomers:
    - C
  B8T:
    id: B8T
    name: 4-methyl, cytidine-5'-monophosphate
    synonyms:
    - C
    - '[(2~{R},3~{S},4~{R},5~{R})-5-[4-(methylamino)-2-oxidanylidene-pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: B8T
    structure: CNc1ccn(c(=O)n1)[C@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - C
  B8W:
    id: B8W
    name: 6-methyl, guanosine-5'-monophosphate
    synonyms:
    - G
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-methoxy-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: B8W
    structure: COc1nc(N)nc2c1ncn2[C@H]1O[C@H]([C@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - G
  B9B:
    id: B9B
    name: 6-propyl, guanosine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-propoxy-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: B9B
    structure: CCCOc1nc(N)nc2c1ncn2[C@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - G
  B9H:
    id: B9H
    name: 2'-methyl, 3-propyl, cytidine-5'-monophosphate
    synonyms:
    - C
    - '[(2~{R},3~{R},4~{R},5~{R})-5-(4-azanyl-2-oxidanylidene-3-propyl-4~{H}-pyrimidin-1-yl)-4-methoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: B9H
    structure: CCCN1[C@@H](N)C=CN(C1=O)[C@H]1O[C@@H]([C@H]([C@H]1OC)O)COP(=O)(O)O
    base_monomers:
    - C
  BGH:
    id: BGH
    name: '[(2~{r},3~{r},4~{r},5~{r})-5-(2-azanyl-7-ethanoyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-4-methoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(2~{R},3~{R},4~{R},5~{R})-5-(2-azanyl-7-ethanoyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-4-methoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: BGH
    structure: CO[C@@H]1[C@@H](O)[C@H](O[C@H]1N1CN(c2c1nc(N)[nH]c2=O)C(=O)C)COP(=O)(O)O
    base_monomers:
    - G
  BMP:
    id: BMP
    name: 6-hydroxyuridine-5'-phosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(6-hydroxy-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 6-hydroxyuridine 5'-(dihydrogen phosphate)
    - N
    identifiers:
    - ns: pdb-ccd
      id: BMP
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1c(O)cc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  BMQ:
    id: BMQ
    name: 1-(5'-phospho-beta-d-ribofuranosyl)barbituric acid
    synonyms:
    - 6-oxouridine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-3,4-bis(oxidanyl)-5-[2,4,6-tris(oxidanylidene)-1,3-diazinan-1-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: BMQ
    structure: O=C1CC(=O)N(C(=O)N1)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(O)O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 20
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 20
  BOE:
    id: BOE
    name: 2'-o-[2-(benzyloxy)ethyl] thymidine-5'-monophosphate
    synonyms:
    - 2'-O-[2-(benzyloxy)ethyl]-5-methyluridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-4-(2-phenylmethoxyethoxy)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - T
    identifiers:
    - ns: pdb-ccd
      id: BOE
    structure: O[C@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@H]1OCCOCc1ccccc1)n1cc(C)c(=O)[nH]c1=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
  BT5:
    id: BT5
    name: biotinyl-5-amp
    synonyms:
    - 5'-O-[(R)-hydroxy({5-[(3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl]pentanoyl}oxy)phosphoryl]adenosine
    - '[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]pentanoate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: BT5
    structure: O=C1N[C@H]2[C@@H](N1)[C@H](SC2)CCCCC(=O)O[P@](=O)(OC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)O
  C2L:
    id: C2L
    name: 5-methyl-3'-o-methoxyethyl cytidine 5'-monophosphate
    synonyms:
    - C
    - '[(2R,3S,4R,5R)-5-(4-amino-5-methyl-2-oxo-pyrimidin-1-yl)-4-hydroxy-3-(2-methoxyethoxy)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-O-(2-methoxyethyl)-5-methylcytidine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: C2L
    structure: COCCO[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@@H]([C@@H]1O)n1cc(C)c(nc1=O)N
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  C31:
    id: C31
    name: 2'-o-3-aminopropyl cytidine-5'-monophosphate
    synonyms:
    - C
    - 2'-O-(3-aminopropyl)cytidine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-4-(3-aminopropoxy)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: C31
    structure: NCCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
  C43:
    id: C43
    name: 2'-o-methyoxyethyl-cytidine-5'-monophosphate
    synonyms:
    - C
    - 2'-O-(2-methoxyethyl)cytidine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-5-(4-azanyl-2-oxidanylidene-pyrimidin-1-yl)-4-(2-methoxyethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: C43
    structure: COCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  C4J:
    id: C4J
    name: (5s)-5-{3-[(3s)-3-amino-3-carboxypropyl]-1-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl}-2,5-anhydro-1-o-phosphono-l-arabinitol
    synonyms:
    - (5S)-5-{3-[(3S)-3-amino-3-carboxypropyl]-1-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl}-2,5-anhydro-1-O-phosphono-L-arabinitol
    - (2~{S})-2-azanyl-4-[5-[(2~{S},3~{R},4~{S},5~{S})-3,4-bis(oxidanyl)-5-(phosphonooxymethyl)oxolan-2-yl]-3-methyl-2,6-bis(oxidanylidene)pyrimidin-1-yl]butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: C4J
    structure: OC(=O)[C@H](CCn1c(=O)c(cn(c1=O)C)[C@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)(O)O)N
  C5L:
    id: C5L
    name: 2'-o-(2-methoxyethyl)-5-methylcytidine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3R,4R,5R)-5-(4-azanyl-5-methyl-2-oxidanylidene-pyrimidin-1-yl)-4-(2-methoxyethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2'-O-(2-methoxyethyl)-5-methylcytidine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: C5L
    structure: COCCO[C@H]1[C@H](O)[C@@H](O[C@H]1n1cc(C)c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  CAR:
    id: CAR
    name: cytosine arabinose-5'-phosphate
    synonyms:
    - C
    - 4-amino-1-(5-O-phosphono-beta-D-arabinofuranosyl)pyrimidin-2(1H)-one
    - '[(2R,3S,4S,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: CAR
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  CBV:
    id: CBV
    name: 5-bromocytidine 5'-(dihydrogen phosphate)
    synonyms:
    - C
    - 5-bromocytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-amino-5-bromo-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: CBV
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(Br)c(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  CCC:
    id: CCC
    name: cytidine-5'-phosphate-2',3'-cyclic phosphate
    synonyms:
    - C
    - '[(1R,3S,5R,6R,8R)-6-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-3-oxo-2,4,7-trioxa-3$l^{5}-phosphabicyclo[3.3.0]octan-8-yl]methyl
      dihydrogen phosphate'
    - '[(2S,3aR,4R,6R,6aR)-6-(4-amino-2-oxopyrimidin-1(2H)-yl)-2-hydroxy-2-oxidotetrahydrofuro[3,4-d][1,3,2]dioxaphosphol-4-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: CCC
    structure: Nc1ccn(c(=O)n1)[C@H]1O[C@@H]([C@@H]2[C@H]1O[P@@](=O)(O2)O)COP(=O)([O-])[O-]
    base_monomers:
    - C
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  CG1:
    id: CG1
    name: 5'-o-[(r)-hydroxy(methoxy)phosphoryl]guanosine
    synonyms:
    - 5'-O-[(R)-hydroxy(methoxy)phosphoryl]guanosine
    - G
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      methyl hydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: CG1
    structure: CO[P@](=O)(OC[C@H]1O[C@@H]([C@H]([C@@H]1O)O)n1cnc2c1nc(N)[nH]c2=O)[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 16
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 16
  CH:
    id: CH
    name: n3-protonated cytidine-5'-monophosphate
    synonyms:
    - C
    - 5'-cytidylic acid
    - '[(2R,3S,4R,5R)-5-(4-amino-2-oxo-3H-pyrimidin-1-ium-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: CH
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1[n+]1ccc([nH]c1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  CM0:
    id: CM0
    name: 5-(carboxymethoxy) uridine-5'-monophosphate
    synonyms:
    - 5-(carboxymethoxy)uridine 5'-(dihydrogen phosphate)
    - 2-[1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-2,4-dioxo-pyrimidin-5-yl]oxyethanoic
      acid
    - N
    identifiers:
    - ns: pdb-ccd
      id: CM0
    structure: OC(=O)COc1cn(c(=O)[nH]c1=O)[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
  CNU:
    id: CNU
    name: 5-cyano-uridine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(5-cyano-2,4-dioxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-cyanouridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: CNU
    structure: N#Cc1cn(c(=O)[nH]c1=O)[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
  CS8:
    id: CS8
    name: 3-thiaoctanoyl-coenzyme a
    synonyms:
    - S-{(9R,13S,15R)-17-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-9,13,15-trihydroxy-10,10-dimethyl-13,15-dioxido-4,8-dioxo-12,14,16-trioxa-3,7-diaza-13,15-diphosphaheptadec-1-yl}
      (pentylsulfanyl)ethanethioate (non-preferred name)
    - S-[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]ethyl]
      2-pentylsulfanylethanethioate
    - N
    identifiers:
    - ns: pdb-ccd
      id: CS8
    structure: CCCCCSCC(=O)SCCNC(=O)CCNC(=O)[C@@H](C(CO[P@](=O)(O[P@](=O)(OC[C@H]1O[C@H]([C@H]([C@H]1OP(=O)(O)O)O)n1cnc2c1ncnc2N)O)O)(C)C)O
  CSF:
    id: CSF
    name: cytidine-5'-monophosphate-3-fluoro-n-acetyl-neuraminic acid
    synonyms:
    - C
    - (3R,4R,5R,6R)-5-acetamido-2-[[(2R,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-3-fluoro-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic
      acid
    - (2S,3R,4R,5R,6R)-5-(acetylamino)-2-{[(R)-{[(2R,3S,4R,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}-3-fluoro-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]tetrahydro-2H-pyran-2-carboxylic
      acid (non-preferred name)
    identifiers:
    - ns: pdb-ccd
      id: CSF
    structure: OC[C@H]([C@H]([C@@H]1O[C@](O[P@@](=O)(OC[C@@H]2O[C@H]([C@H]([C@@H]2O)O)n2ccc(nc2=O)N)O)(C(=O)O)[C@H]([C@H]([C@@H]1NC(=O)C)O)F)O)O
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 25
  DBM:
    id: DBM
    name: 9-(6-deoxy-beta-d-allofuranosyl)-6-methylpurine
    synonyms:
    - 9-(6-deoxy-beta-D-allofuranosyl)-6-methyl-9H-purine
    - (2R,3S,4R,5R)-2-(1-hydroxyethyl)-5-(6-methylpurin-9-yl)oxolane-3,4-diol
    - N
    identifiers:
    - ns: pdb-ccd
      id: DBM
    structure: C[C@@H]([C@H]1O[C@H]([C@H]([C@H]1O)O)n1cnc2c1ncnc2C)O
  DJF:
    id: DJF
    name: "[(1s,5r,6r,8r)-6-(6-aminopurin-9-yl)-2'-(3-oxidanylpropoxy)spiro[2,4,7-trioxa-3-boranuidabicyclo[3.3.0]octane-3,9'-8-oxa-9-boranuidabicyclo[4.3.0]nona-1(6),2,4-triene]-8-yl]methyl\
      \ dihydrogen phosphate"
    synonyms:
    - "[(1S,5R,6R,8R)-6-(6-aminopurin-9-yl)-2'-(3-oxidanylpropoxy)spiro[2,4,7-trioxa-3-boranuidabicyclo[3.3.0]octane-3,9'-8-oxa-9-boranuidabicyclo[4.3.0]nona-1(6),2,4-triene]-8-yl]methyl\
      \ dihydrogen phosphate"
    identifiers:
    - ns: pdb-ccd
      id: DJF
    structure: OCCCOc1cccc2c1[B@-]1(OC2)O[C@H]2[C@@H](O1)[C@@H](O[C@H]2n1cnc2c1ncnc2N)COP(=O)([O-])[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 38
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 41
      charge: -1
  E3C:
    id: E3C
    name: 3-ethyl, cytidine-5'-monophosphate
    synonyms:
    - C
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(4-azanyl-3-ethyl-2-oxidanylidene-4~{H}-pyrimidin-1-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: E3C
    structure: CCN1[C@H](N)C=CN(C1=O)[C@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - C
  E6G:
    id: E6G
    name: 6-ethyl, guanosine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-ethoxy-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: E6G
    structure: CCOc1nc(N)nc2c1ncn2[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - G
  E7G:
    id: E7G
    name: 7-ethyl, guanosine-5'-monophosphate
    synonyms:
    - G
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-7-ethyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: E7G
    structure: CCN1CN(c2c1c(=O)[nH]c(n2)N)[C@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)(O)O
    base_monomers:
    - G
  EIT:
    id: EIT
    name: ((3r,4r,5r)-4-(2-(1h-imidazol-1-yl)ethoxy)-3-hydroxy-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-tetrahydrofuran-2-yl)methyl
      dihydrogen phosphate
    synonyms:
    - '[(2R,3R,4R,5R)-3-hydroxy-4-(2-imidazol-1-ylethoxy)-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - T
    - 2'-O-[2-(1H-imidazol-1-yl)ethyl]-5-methyluridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: EIT
    structure: O[C@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@H]1OCCn1cncc1)n1cc(C)c(=O)[nH]c1=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
  ENA:
    id: ENA
    name: etheno-nad
    synonyms:
    - '[[(2R,3S,4R,5R)-5-(3-aminocarbonylpyridin-1-ium-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-oxidanidyl-phosphoryl]
      [(2R,3S,4R,5R)-3,4-dihydroxy-5-(9H-imidazo[2,1-f]purin-6-ium-3-yl)oxolan-2-yl]methyl
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: ENA
    structure: O[C@H]1[C@@H](CO[P@](=O)(O[P@@](=O)(OC[C@H]2O[C@@H]([C@@H]([C@@H]2O)O)[n+]2cccc(c2)C(=O)N)[O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1nc[n+]1c2[nH]cc1
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  ENP:
    id: ENP
    name: etheno-nadp
    synonyms:
    - '[(2R,3R,4R,5R)-3-hydroxy-5-imidazo[2,1-f]purin-3-yl-4-phosphonooxy-oxolan-2-yl]methyl
      [hydroxy-[[(2R,3S,4R,5R)-3,4,5-trihydroxyoxolan-2-yl]methoxy]phosphoryl] hydrogen
      phosphate'
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(3H-imidazo[2,1-i]purin-3-yl)-4-(phosphonooxy)tetrahydrofuran-2-yl]methyl
      [(2R,3S,4R,5R)-3,4,5-trihydroxytetrahydrofuran-2-yl]methyl dihydrogen diphosphate
      (non-preferred name)'
    - N
    identifiers:
    - ns: pdb-ccd
      id: ENP
    structure: O[C@@H]1[C@@H](CO[P@@](=O)(O[P@@](=O)(OC[C@H]2O[C@@H]([C@@H]([C@@H]2O)O)O)O)O)O[C@@H]([C@@H]1OP(=O)(O)O)n1cnc2c1ncn1c2ncc1
  ENQ:
    id: ENQ
    name: '[[(2r,3s,4r,5r)-3,4-dihydroxy-5-(9h-imidazo[2,1-f]purin-6-ium-3-yl)oxolan-2-yl]methoxy-oxidanidyl-phosphoryl]
      [(2r,3s,4r,5r)-3,4-dihydroxy-5-oxidanidyl-oxolan-2-yl]methyl phosphate'
    synonyms:
    - '[[(2R,3S,4R,5R)-3,4-dihydroxy-5-(9H-imidazo[2,1-f]purin-6-ium-3-yl)oxolan-2-yl]methoxy-oxidanidyl-phosphoryl]
      [(2R,3S,4R,5R)-3,4,5-trihydroxyoxolan-2-yl]methyl phosphate'
    identifiers:
    - ns: pdb-ccd
      id: ENQ
    structure: O[C@H]1[C@@H](CO[P@@](=O)(O[P@](=O)(OC[C@H]2O[C@H]([C@@H]([C@@H]2O)O)O)[O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1nc[n+]1c2[nH]cc1
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  EQ4:
    id: EQ4
    name: 5'-o-[(r)-(2-amino-1h-imidazol-1-yl)(hydroxy)phosphoryl]guanosine
    synonyms:
    - (2-azanylimidazol-1-yl)-[[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-oxidanylidene-1~{H}-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy]phosphinic
      acid
    - 5'-O-[(R)-(2-amino-1H-imidazol-1-yl)(hydroxy)phosphoryl]guanosine
    identifiers:
    - ns: pdb-ccd
      id: EQ4
    structure: Nc1[nH]c(=O)c2c(n1)n(cn2)[C@@H]1O[C@@H]([C@@H]([C@H]1O)O)CO[P@](=O)(n1ccnc1N)O
    base_monomers:
    - G
  F2T:
    id: F2T
    name: 2'-deoxy-2'-fluoro-5'-o-thiophosphonouridine
    synonyms:
    - 2'-deoxy-2'-fluoro-5'-O-thiophosphonouridine
    - '[(2~{R},3~{R},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-fluoranyl-3-oxidanyl-oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    identifiers:
    - ns: pdb-ccd
      id: F2T
    structure: O[C@@H]1[C@@H](CO[P@](=O)(S)[O-])O[C@@H]([C@@H]1F)n1ccc(=O)[nH]c1=O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  F3N:
    id: F3N
    name: 3'-deoxy-3'-(l-phenylalanylamino)adenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2S,3S,4R,5R)-5-(6-aminopurin-9-yl)-3-[[(2S)-2-azanyl-3-phenyl-propanoyl]amino]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-3'-(L-phenylalanylamino)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: F3N
    structure: O=C([C@H](Cc1ccccc1)N)N[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1ncnc2N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  F3O:
    id: F3O
    name: 3'-o-l-phenylalanyladenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-oxidanyl-2-(phosphonooxymethyl)oxolan-3-yl]
      (2S)-2-azanyl-3-phenyl-propanoate'
    - 3'-O-L-phenylalanyladenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: F3O
    structure: O=C([C@@H](Cc1ccccc1)N)O[C@@H]1[C@H](COP(=O)(O)O)O[C@H]([C@@H]1O)n1cnc2c1ncnc2N
  FA2:
    id: FA2
    name: 5-(6-amino-9h-purin-9-yl)-4-hydroxytetrahydrofuran-3-yl dihydrogen phosphate
    synonyms:
    - A
    - (3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxytetrahydrofuran-3-yl dihydrogen
      phosphate
    - '[(3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-oxolan-3-yl] dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: FA2
    structure: O[C@@H]1[C@@H](CO[C@H]1n1cnc2c1ncnc2N)OP(=O)([O-])[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  FA5:
    id: FA5
    name: adenosine-5'-[phenylalaninyl-phosphate]
    synonyms:
    - 5'-O-[(S)-{[(2S)-2-amino-3-phenylpropanoyl]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-3-phenyl-propanoate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: FA5
    structure: O=C([C@H](Cc1ccccc1)N)O[P@](=O)(OC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)[O-]
  FAI:
    id: FAI
    name: 5-(formylamino)-1-(5-o-phosphono-beta-d-ribofuranosyl)-1h-imidazole-4-carboxamide
    synonyms:
    - 5-(formylamino)-1-(5-O-phosphono-beta-D-ribofuranosyl)-1H-imidazole-4-carboxamide
    - '[(2R,3S,4R,5R)-5-(4-aminocarbonyl-5-formamido-imidazol-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: FAI
    structure: O=CNc1c(ncn1[C@@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)([O-])[O-])C(=O)N
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 19
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 19
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  FHU:
    id: FHU
    name: (5s,6r)-5-fluoro-6-hydroxy-pseudouridine-5'-monophosphate
    synonyms:
    - (1R)-1,4-anhydro-1-[(4R,5S)-5-fluoro-4-hydroxy-2,6-dioxohexahydropyrimidin-5-yl]-5-O-phosphono-D-ribitol
    - '[(2R,3S,4R,5R)-5-[(4R,5S)-5-fluoro-4-hydroxy-2,6-dioxo-1,3-diazinan-5-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: FHU
    structure: O=C1N[C@H](O)[C@@](C(=O)N1)(F)[C@@H]1O[C@H]([C@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  FMU:
    id: FMU
    name: 5-fluoro-5-methyluridine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-[(5S)-5-fluoro-5-methyl-2,4-dioxo-1,3-diazinan-1-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-fluoro-5-methyluridine 5'-(dihydrogen phosphate)
    - N
    identifiers:
    - ns: pdb-ccd
      id: FMU
    structure: O[C@H]1[C@H](O)[C@@H](O[C@H]1N1C[C@@](C)(F)C(=O)NC1=O)COP(=O)(O)O
  G2L:
    id: G2L
    name: 3'-o-methyoxyethyl-guanosine-5'-monophosphate
    synonyms:
    - 3'-O-(2-methoxyethyl)guanosine 5'-(dihydrogen phosphate)
    - G
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-4-hydroxy-3-(2-methoxyethoxy)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: G2L
    structure: COCCO[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@@H]([C@@H]1O)n1cnc2c1nc(N)[nH]c2=O
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  G46:
    id: G46
    name: guanosine-5'-monothiophosphate
    synonyms:
    - G
    - '[(2R,3S,4R,5R)-5-(2-azanyl-6-oxidanylidene-1H-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    - 5'-O-thiophosphonoguanosine
    identifiers:
    - ns: pdb-ccd
      id: G46
    structure: O[C@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)CO[P@@](=O)(S)O
    base_monomers:
    - G
  G48:
    id: G48
    name: 2'-o-methyoxyethyl-guanosine-5'-monophosphate
    synonyms:
    - 2'-O-(2-methoxyethyl)guanosine 5'-(dihydrogen phosphate)
    - G
    - '[(2R,3R,4R,5R)-5-(2-azanyl-6-oxidanylidene-1H-purin-9-yl)-4-(2-methoxyethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: G48
    structure: COCCO[C@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 32
      charge: -1
  G4P:
    id: G4P
    name: guanosine-5',3'-tetraphosphate
    synonyms:
    - guanosine 3',5'-bis(trihydrogen diphosphate)
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-4-hydroxy-3-(hydroxy-phosphonooxy-phosphoryl)oxy-oxolan-2-yl]methyl
      phosphono hydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: G4P
    structure: O[C@@H]1[C@H](O[P@](=O)(OP(=O)(O)O)O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)CO[P@@](=O)(OP(=O)(O)O)O
  G7M:
    id: G7M
    name: n7-methyl-guanosine-5'-monophosphate
    synonyms:
    - G
    - '[(2R,3S,4R,5R)-5-(2-amino-7-methyl-6-oxo-1H-purin-7-ium-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 7-methylguanosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: G7M
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1c[n+](c2c1nc(N)[nH]c2=O)C)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  GAO:
    id: GAO
    name: guanine arabinose-5'-phosphate
    synonyms:
    - G
    - 2-amino-9-(5-O-phosphono-beta-D-arabinofuranosyl)-1,9-dihydro-6H-purin-6-one
    - '[(2R,3S,4S,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: GAO
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  GDO:
    id: GDO
    name: 3'-deoxy-guanosine 5'-monophosphate
    synonyms:
    - 3'-deoxy-5'-guanylic acid
    - '[(2S,4R,5R)-5-(2-azanyl-6-oxidanylidene-1H-purin-9-yl)-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: GDO
    structure: O[C@H]1C[C@@H](O[C@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)(O)O
    base_monomers:
    - G
  GDP:
    id: GDP
    name: guanosine-5'-diphosphate
    synonyms:
    - guanosine 5'-(trihydrogen diphosphate)
    - G
    - '[(2R,3S,4R,5R)-5-(2-azanyl-6-oxidanylidene-1H-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      phosphono hydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: GDP
    structure: O[C@@H]1[C@@H](CO[P@@](=O)(OP(=O)(O)O)O)O[C@@H]([C@@H]1O)n1cnc2c1nc(N)[nH]c2=O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  GDR:
    id: GDR
    name: guanosine-5'-diphosphate-rhamnose
    synonyms:
    - G
    - '[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      [(2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyl-oxan-2-yl] hydrogen phosphate'
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl
      (2R,3S,4S,5S,6R)-3,4,5-trihydroxy-6-methyltetrahydro-2H-pyran-2-yl dihydrogen
      diphosphate (non-preferred name)'
    identifiers:
    - ns: pdb-ccd
      id: GDR
    structure: O[C@H]1[C@@H](CO[P@@](=O)(O[P@](=O)(O[C@@H]2O[C@@H](C)[C@@H]([C@@H]([C@@H]2O)O)O)O)O)O[C@H]([C@H]1O)n1cnc2c1nc(N)[nH]c2=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 27
  GH3:
    id: GH3
    name: 3'-deoxy-guanosine-5'-triphosphate
    synonyms:
    - G
    - '[[(2S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-4-hydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      phosphono hydrogen phosphate'
    - 3'-deoxyguanosine 5'-(tetrahydrogen triphosphate)
    identifiers:
    - ns: pdb-ccd
      id: GH3
    structure: O[C@@H]1C[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)CO[P@@](=O)(O[P@@](=O)(OP(=O)(O)O)O)O
    base_monomers:
    - G
  GMU:
    id: GMU
    name: 2'-o-[(2-guanidinium)ethyl]-5-methyluridine 5'-monophosphate
    synonyms:
    - 2'-O-{2-[(diaminomethyl)amino]ethyl}-5-methyluridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-4-[2-(diaminomethylamino)ethoxy]-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: GMU
    structure: NC(NCCO[C@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O)N
  GOM:
    id: GOM
    name: glutamol-amp
    synonyms:
    - (4S)-5-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-oxido-phosphoryl]oxy-4-azaniumyl-pentanoate
    - G
    - 5'-O-({[(2S)-2-ammonio-4-carboxylatobutyl]oxy}phosphinato)adenosine
    identifiers:
    - ns: pdb-ccd
      id: GOM
    structure: '[O-]C(=O)CC[C@H](CO[P@](=O)(OC[C@H]1O[C@H]([C@H]([C@H]1O)O)n1cnc2c1ncnc2N)[O-])[NH3+]'
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
  GRB:
    id: GRB
    name: 8-bromoguanosine 5'-(dihydrogen phosphate)
    synonyms:
    - 8-bromoguanosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(2-azanyl-8-bromo-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: GRB
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1c(Br)nc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  I4U:
    id: I4U
    name: 4-isopropyl, uridine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-3,4-bis(oxidanyl)-5-(2-oxidanylidene-4-propan-2-yloxy-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: I4U
    structure: CC(Oc1ccn(c(=O)n1)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)(O)O)C
    base_monomers:
    - U
  IC:
    id: IC
    name: isocytidine-5'-monophosphate
    synonyms:
    - C
    - '[(2R,3S,4R,5R)-5-(2-amino-4-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2-amino-1-(5-O-phosphono-beta-D-ribofuranosyl)pyrimidin-4(1H)-one
    identifiers:
    - ns: pdb-ccd
      id: IC
    structure: O[C@@H]1[C@H](O)[C@H](O[C@H]1n1ccc(=O)nc1N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 22
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  IG:
    id: IG
    name: isoguanosine-5'-monophosphate
    synonyms:
    - G
    - 2-oxoadenosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(6-amino-2-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: IG
    structure: O[C@@H]1[C@H](O)[C@H](O[C@H]1n1cnc2c1nc(=O)[nH]c2N)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  IPN:
    id: IPN
    name: 2-aminoethylglycine-carbonylmethylene-5-iodouracil
    synonyms:
    - 2-[carboxymethyl-[2-(5-iodo-2,4-dioxo-pyrimidin-1-yl)ethanoyl]amino]ethylazanium
    - 2-{(carboxymethyl)[(5-iodo-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)acetyl]amino}ethanaminium
    - N
    identifiers:
    - ns: pdb-ccd
      id: IPN
    structure: '[NH3+]CCN(C(=O)Cn1cc(I)c(=O)[nH]c1=O)CC(=O)O'
  IRN:
    id: IRN
    name: 1-(5-o-phosphono-beta-d-ribofuranosyl)-1h-imidazole
    synonyms:
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-1H-imidazole
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-imidazol-1-yl-oxolan-2-yl]methyl dihydrogen
      phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: IRN
    structure: O[C@H]1[C@@H](COP(=O)(O)O)O[C@@H]([C@@H]1O)n1cncc1
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  IU:
    id: IU
    name: 5-iodouridine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(5-iodo-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-iodouridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: IU
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(I)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  JLN:
    id: JLN
    name: 5-(formylamino)-1-(5-o-phosphono-beta-d-ribofuranosyl)-1h-imidazole-4-carboxylic
      acid
    synonyms:
    - 1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]-5-formamido-imidazole-4-carboxylic
      acid
    identifiers:
    - ns: pdb-ccd
      id: JLN
    structure: O=CNc1c(ncn1[C@@H]1O[C@@H]([C@H]([C@@H]1O)O)COP(=O)(O)O)C(=O)O
  JW5:
    id: JW5
    name: 6-(hydroxymethyl)uridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-[6-(hydroxymethyl)-2,4-dioxo-pyrimidin-1-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 6-(hydroxymethyl)uridine 5'-(dihydrogen phosphate)
    - N
    identifiers:
    - ns: pdb-ccd
      id: JW5
    structure: OCc1cc(=O)[nH]c(=O)n1[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
  KAG:
    id: KAG
    name: 2'-deoxy-n-[(1s)-1-methyl-3-oxopropyl]guanosine 5'-phosphate
    synonyms:
    - 2'-deoxy-N-[(1S)-1-methyl-3-oxopropyl]guanosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,5R)-3-hydroxy-5-[6-oxo-2-[[(2S)-4-oxobutan-2-yl]amino]-1H-purin-9-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: KAG
    structure: O=CC[C@@H](Nc1[nH]c(=O)c2c(n1)n(cn2)[C@@H]1C[C@@H]([C@H](O1)COP(=O)(O)O)O)C
    base_monomers:
    - G
  KGV:
    id: KGV
    name: 3'-deoxy-3'-(d-phenylalanylamino)adenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2~{S},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-3-[[(2~{R})-2-azanyl-3-phenyl-propanoyl]amino]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-3'-(D-phenylalanylamino)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: KGV
    structure: O=C([C@@H](Cc1ccccc1)N)N[C@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@@H]1O)n1cnc2c1ncnc2N
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 20
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  LCA:
    id: LCA
    name: '[(1r,3r,4r,7s)-7-hydroxy-3-(adenin-9-yl)-2,5-dioxabicyclo[2.2.1]hept-1-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - A
    - 9-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}-9H-purin-6-amine
    - '[(1R,4R,6R,7S)-6-(6-aminopurin-9-yl)-7-hydroxy-2,5-dioxabicyclo[2.2.1]heptan-4-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: LCA
    structure: O[C@H]1[C@@H]2OC[C@]1(COP(=O)(O)O)O[C@H]2n1cnc2c1ncnc2N
    base_monomers:
    - A
  LCC:
    id: LCC
    name: '[(1r,3r,4r,7s)-7-hydroxy-3-(5-methylcytosin-1-yl)-2,5-dioxabicyclo[2.2.1]hept-1-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(1R,4R,5R,7S)-5-(4-amino-5-methyl-2-oxo-pyrimidin-1-yl)-7-hydroxy-3,6-dioxabicyclo[2.2.1]heptan-1-yl]methyl
      dihydrogen phosphate'
    - 4-amino-1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}-5-methylpyrimidin-2(1H)-one
    - N
    identifiers:
    - ns: pdb-ccd
      id: LCC
    structure: O[C@@H]1[C@H]2OC[C@]1(COP(=O)(O)O)O[C@H]2n1cc(C)c(nc1=O)N
  LCG:
    id: LCG
    name: '[(1r,3r,4r,7s)-7-hydroxy-3-(guanin-9-yl)-2,5-dioxabicyclo[2.2.1]hept-1-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - G
    - 2-amino-9-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}-1,9-dihydro-6H-purin-6-one
    - '[(1R,4R,6R,7S)-6-(2-amino-6-oxo-1H-purin-9-yl)-7-hydroxy-2,5-dioxabicyclo[2.2.1]heptan-4-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: LCG
    structure: O[C@H]1[C@@H]2OC[C@]1(COP(=O)([O-])[O-])O[C@H]2n1cnc2c1nc(N)[nH]c2=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  LKC:
    id: LKC
    name: 4-amino-1-[(1s,3r,4r,7s)-7-hydroxy-1-(hydroxymethyl)-2,5-dioxabicyclo[2.2.1]hept-3-yl]-5-methylpyrimidin-2(1h)-one
    synonyms:
    - 4-amino-1-[2,5-anhydro-4-(hydroxymethyl)-alpha-L-lyxofuranosyl]-5-methylpyrimidin-2(1H)-one
    - 4-amino-1-[(1R,4S,6R,7S)-7-hydroxy-4-(hydroxymethyl)-2,5-dioxabicyclo[2.2.1]heptan-6-yl]-5-methyl-pyrimidin-2-one
    - N
    identifiers:
    - ns: pdb-ccd
      id: LKC
    structure: Cc1cn([C@@H]2O[C@]3([C@H]([C@H]2OC3)O)CO)c(=O)nc1N
  LMS:
    id: LMS
    name: '[(2r,3s,4r,5r)-5-(6-amino-9h-purin-9-yl)-3,4-dihydroxytetrahydro-2-furanyl]methyl
      sulfamate'
    synonyms:
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl sulfamate'
    - 5'-O-sulfamoyladenosine
    - N
    identifiers:
    - ns: pdb-ccd
      id: LMS
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)COS(=O)(=O)N
  M1Y:
    id: M1Y
    name: (1s)-1,4-anhydro-1-(1-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5-o-phosphono-d-xylitol
    synonyms:
    - (1S)-1,4-anhydro-1-(1-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5-O-phosphono-D-xylitol
    - '[(2~{R},3~{R},4~{R},5~{S})-5-[1-methyl-2,4-bis(oxidanylidene)pyrimidin-5-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: M1Y
    structure: O[C@@H]1[C@H](O)[C@H](O[C@H]1c1cn(C)c(=O)[nH]c1=O)COP(=O)(O)O
  M3O:
    id: M3O
    name: 3'-o-(n-formyl-l-methionyl)adenosine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-oxidanyl-2-(phosphonooxymethyl)oxolan-3-yl]
      (2S)-2-formamido-4-methylsulfanyl-butanoate'
    - 3'-O-(N-formyl-L-methionyl)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: M3O
    structure: CSCC[C@H](C(=O)O[C@H]1[C@@H](COP(=O)(O)O)O[C@H]([C@H]1O)n1cnc2c1ncnc2N)NC=O
  M5M:
    id: M5M
    name: 2'-(n-acetamide)-cytidine-5'-monophosphate
    synonyms:
    - C
    - 2'-(acetylamino)-2'-deoxycytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-4-acetamido-5-(4-amino-2-oxo-pyrimidin-1-yl)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: M5M
    structure: CC(=O)N[C@@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  M7A:
    id: M7A
    name: 7-methyl, adenosine-5'-monophosphate
    synonyms:
    - A
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(6-azanyl-7-methyl-8~{H}-purin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: M7A
    structure: O[C@@H]1[C@@H](O)[C@@H](O[C@@H]1N1CN(c2c1ncnc2N)C)COP(=O)(O)O
    base_monomers:
    - A
  MGQ:
    id: MGQ
    name: 7-benzyl guanine monophosphate
    synonyms:
    - A
    - 7-benzylguanosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-[2-amino-6-oxo-7-(phenylmethyl)-1H-purin-7-ium-9-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: MGQ
    structure: O[C@H]1[C@@H](O)[C@H](O[C@@H]1n1c[n+](c2c1nc(N)[nH]c2=O)Cc1ccccc1)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  MGV:
    id: MGV
    name: p-fluoro-7-benzyl guanine monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-[2-amino-7-[(4-fluorophenyl)methyl]-6-oxo-1H-purin-7-ium-9-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    - 7-(4-fluorobenzyl)guanosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: MGV
    structure: O[C@H]1[C@@H](O)[C@H](O[C@@H]1n1c[n+](c2c1nc(N)[nH]c2=O)Cc1ccc(cc1)F)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 34
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 36
      charge: -1
  MHG:
    id: MHG
    name: 2-methyl, 7-(3-methyl-pentane), guanosine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-[2-(methylamino)-7-[(3~{S})-3-methylpentyl]-6-oxidanylidene-1,8-dihydropurin-9-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: MHG
    structure: CC[C@H](CCN1CN(c2c1c(=O)[nH]c(n2)NC)[C@@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)(O)O)C
    base_monomers:
    - G
  MIA:
    id: MIA
    name: 2-methylthio-n6-isopentenyl-adenosine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-[6-(3-methylbutylamino)-2-methylsulfanyl-purin-9-yl]oxolan-2-yl]methyl
      dihydrogen phosphate'
    - A
    - N-(3-methylbutyl)-2-(methylsulfanyl)adenosine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: MIA
    structure: CSc1nc(NCCC(C)C)c2c(n1)n(cn2)[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 28
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 31
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 28
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  MTU:
    id: MTU
    name: 9-beta-d-ribofuranosyl-9h-purin-2-amine
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    - A
    - 9-(5-O-phosphono-beta-D-ribofuranosyl)-9H-purin-2-amine
    identifiers:
    - ns: pdb-ccd
      id: MTU
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1cnc2c1nc(N)nc2)COP(=O)(O)O
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  MUM:
    id: MUM
    name: 5'-o-(dihydroxyphosphanyl)-5-methyl-5,6-dihydrouridine
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-[(5~{R})-5-methyl-2,4-bis(oxidanylidene)-1,3-diazinan-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphite'
    - 5'-O-(dihydroxyphosphanyl)-5-methyl-5,6-dihydrouridine
    identifiers:
    - ns: pdb-ccd
      id: MUM
    structure: OP(OC[C@H]1O[C@@H]([C@H]([C@@H]1O)O)N1C[C@@H](C)C(=O)NC1=O)O
  N5M:
    id: N5M
    name: 5-nitrocytidine 5'-(dihydrogen phosphate)
    synonyms:
    - C
    - 5-nitrocytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-amino-5-nitro-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: N5M
    structure: O[C@H]1[C@@H](O)[C@H](O[C@@H]1n1cc([N+](=O)[O-])c(nc1=O)N)COP(=O)([O-])[O-]
    base_monomers:
    - C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  N6G:
    id: N6G
    name: ((2r,3s,4r,5s)-5-(2,6-diamino-9h-purin-9-yl)-3,4-dihydroxy-tetrahydrofuran-2-yl)methyl
      dihydrogen phosphate
    synonyms:
    - G
    - 2-aminoadenosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(2,6-diaminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: N6G
    structure: Nc1nc(N)c2c(n1)n(cn2)[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 22
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 25
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 22
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 28
      charge: -1
  NF2:
    id: NF2
    name: (1s)-1,4-anhydro-1-(2,4-difluoro-5-methylphenyl)-5-o-phosphono-d-ribitol
    synonyms:
    - (1S)-1,4-anhydro-1-(2,4-difluoro-5-methylphenyl)-5-O-phosphono-D-ribitol
    - '[(2R,3S,4R,5S)-5-(2,4-difluoro-5-methyl-phenyl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: NF2
    structure: O[C@H]1[C@@H](O)[C@H](O[C@@H]1c1cc(C)c(cc1F)F)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  O2C:
    id: O2C
    name: 3'-deoxy-cytidine-5'-monophosphate
    synonyms:
    - '[(2S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-4-hydroxy-oxolan-2-yl]methyl dihydrogen
      phosphate'
    - 3'-deoxy-5'-cytidylic acid
    - N
    identifiers:
    - ns: pdb-ccd
      id: O2C
    structure: O[C@H]1C[C@H](O[C@H]1n1ccc(nc1=O)N)COP(=O)(O)O
  O2G:
    id: O2G
    name: 2'-deoxy-n,n-dimethyl-5'-o-[oxido(oxo)phosphonio]guanosine
    synonyms:
    - 2'-deoxy-N,N-dimethylguanosine 5'-(dihydrogen phosphate)
    - '[(2R,3S,5R)-5-(2-dimethylamino-6-oxo-1H-purin-9-yl)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: O2G
    structure: O[C@H]1C[C@H](O[C@@H]1COP(=O)(O)O)n1cnc2c1nc([nH]c2=O)N(C)C
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  OAD:
    id: OAD
    name: 2'-o-acetyl adenosine-5-diphosphoribose
    synonyms:
    - '[(2S,3R,4R,5R)-5-[[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]oxymethyl]-2,4-dihydroxy-oxolan-3-yl]
      ethanoate'
    - (2S,3R,4R,5R)-5-({[(R)-{[(S)-{[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methoxy}(hydroxy)phosphoryl]oxy}(hydroxy)phosphoryl]oxy}methyl)-2,4-dihydroxytetrahydrofuran-3-yl
      acetate (non-preferred name)
    - N
    identifiers:
    - ns: pdb-ccd
      id: OAD
    structure: CC(=O)O[C@@H]1[C@@H](O)O[C@@H]([C@H]1O)CO[P@@](=O)(O[P@@](=O)(OC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cnc2c1ncnc2N)O)O
  ODP:
    id: ODP
    name: 4-oxo-nicotinamide-adenine dinucleotide phosphate
    synonyms:
    - '[[(2R,3S,4R,5R)-5-(3-aminocarbonyl-4-oxo-3H-pyridin-1-ium-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      [(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-3-hydroxy-4-phosphonooxy-oxolan-2-yl]methyl
      hydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: ODP
    structure: O[C@H]1[C@@H](O)[C@H](O[C@@H]1[N+]1=C[C@H](C(=O)C=C1)C(=O)N)CO[P@@](=O)(O[P@@](=O)(OC[C@@H]1O[C@@H]([C@H]([C@H]1O)OP(=O)(O)O)n1cnc2c1ncnc2N)O)O
  ONE:
    id: ONE
    name: 1-(beta-d-ribofuranosyl)-pyridin-4-one-5'-phosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(4-oxopyridin-1-yl)oxolan-2-yl]methyl dihydrogen
      phosphate'
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)pyridin-4(1H)-one
    - U
    identifiers:
    - ns: pdb-ccd
      id: ONE
    structure: O[C@@H]1[C@@H](O)[C@H](O[C@@H]1n1ccc(=O)cc1)COP(=O)([O-])[O-]
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  OOB:
    id: OOB
    name: 5'-o-[(r)-(benzoyloxy)(hydroxy)phosphoryl]adenosine
    synonyms:
    - 5'-O-[(R)-(benzoyloxy)(hydroxy)phosphoryl]adenosine
    - '[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]
      benzoate'
    identifiers:
    - ns: pdb-ccd
      id: OOB
    structure: O[C@@H]1[C@H](CO[P@@](=O)(OC(=O)c2ccccc2)O)O[C@H]([C@@H]1O)n1cnc2c1ncnc2N
  P1P:
    id: P1P
    name: 3-{[oxido(oxo)phosphino]oxy}propan-1-olate
    synonyms:
    - 3-(oxido-oxo-phosphaniumyl)oxypropan-1-olate
    - (3-oxidopropoxy)(oxo)phosphoniumolate
    - N
    identifiers:
    - ns: pdb-ccd
      id: P1P
    structure: '[O-]CCCO[P+](=O)[O-]'
  P2T:
    id: P2T
    name: 2'-o-propyl thymidine-5-monophosphate
    synonyms:
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-4-propoxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-methyl-2'-O-propyluridine 5'-(dihydrogen phosphate)
    - T
    identifiers:
    - ns: pdb-ccd
      id: P2T
    structure: CCCO[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 9
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 9
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  P4U:
    id: P4U
    name: 4-propyl, uridine-5'-monophosphate
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-3,4-bis(oxidanyl)-5-(2-oxidanylidene-4-propoxy-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: P4U
    structure: CCCOc1ccn(c(=O)n1)[C@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - U
  P5P:
    id: P5P
    name: purine riboside-5'-monophosphate
    synonyms:
    - A
    - 9-(5-O-phosphono-beta-D-ribofuranosyl)-9H-purine
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-purin-9-yl-oxolan-2-yl]methyl dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: P5P
    structure: O[C@H]1[C@@H](O)[C@@H](O[C@H]1n1cnc2c1ncnc2)COP(=O)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  P7G:
    id: P7G
    name: 7-propyl, guanosine-5'-monophosphate
    synonyms:
    - G
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-6-oxidanylidene-7-propyl-3,8-dihydropurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: P7G
    structure: CCCN1CN(c2c1c(=O)nc([nH]2)N)[C@@H]1O[C@H]([C@@H]([C@H]1O)O)COP(=O)(O)O
    base_monomers:
    - G
  PGP:
    id: PGP
    name: guanosine-3',5'-diphosphate
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-4-hydroxy-2-(phosphonooxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    - G
    - guanosine 3',5'-bis(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: PGP
    structure: O[C@@H]1[C@H](OP(=O)(O)O)[C@H](O[C@@H]1n1cnc2c1nc(N)[nH]c2=O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 30
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 33
      charge: -1
  PMT:
    id: PMT
    name: phosphoric acid mono-[3-(3-{[5-(4-amino-2-oxo-2h-pyrimidin-1-yl)-3,4- dihydroxy-tetrahydro-furan-2-
      ylmethoxy]-hydroxy-phosphoryloxy}-3-oxo-propylcarbamoyl)-3-hydroxy-2,2- dimethyl-propyl]
      ester
    synonyms:
    - C
    - 5'-O-{(S)-hydroxy[(3-{[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]amino}propanoyl)oxy]phosphoryl}cytidine
    - '[[(2R,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      3-[[(2R)-2-hydroxy-3,3-dimethyl-4-phosphonooxy-butanoyl]amino]propanoate'
    identifiers:
    - ns: pdb-ccd
      id: PMT
    structure: O=C(O[P@](=O)(OC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1ccc(nc1=O)N)O)CCNC(=O)[C@@H](C(COP(=O)(O)O)(C)C)O
    base_monomers:
    - C
  PPU:
    id: PPU
    name: puromycin-5'-monophosphate
    synonyms:
    - A
    - '[(2S,3S,4R,5R)-3-[[(2S)-2-amino-3-(4-methoxyphenyl)propanoyl]amino]-5-(6-dimethylaminopurin-9-yl)-4-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-deoxy-N,N-dimethyl-3'-[(O-methyl-L-tyrosyl)amino]adenosine 5'-(dihydrogen
      phosphate)
    identifiers:
    - ns: pdb-ccd
      id: PPU
    structure: COc1ccc(cc1)C[C@H](C(=O)N[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@@H]([C@@H]1O)n1cnc2c1ncnc2N(C)C)N
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 24
      charge: -1
  PQ1:
    id: PQ1
    name: phosphoric acid mono-[5-(2-amino-5-aminomethyl-4-oxo-3,5-dihydro-4h-pyrido[2,3-d]pyrimidin-8-yl)-3,4-dihydroxy-tetrahydro-furan-2-ylmethyl]
      ester
    synonyms:
    - '[(2R,3S,4R,5R)-5-[2-amino-5-(aminomethyl)-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-7-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 2-amino-5-(aminomethyl)-7-(5-O-phosphono-beta-D-ribofuranosyl)-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one
    - N
    identifiers:
    - ns: pdb-ccd
      id: PQ1
    structure: NCc1cn(c2c1c(=O)[nH]c(n2)N)[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  PU:
    id: PU
    name: puromycin-n-aminophosphonic acid
    synonyms:
    - A
    - '[[(2S)-1-[[(2S,3S,4R,5R)-5-(6-dimethylaminopurin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl]amino]-3-(4-methoxyphenyl)-1-oxo-propan-2-yl]amino]phosphonic
      acid'
    - 3'-deoxy-N,N-dimethyl-3'-[(O-methyl-N-phosphono-L-tyrosyl)amino]adenosine
    identifiers:
    - ns: pdb-ccd
      id: PU
    structure: OC[C@H]1O[C@@H]([C@@H]([C@@H]1NC(=O)[C@H](NP(=O)([O-])[O-])Cc1ccc(cc1)OC)O)n1cnc2c1ncnc2N(C)C
    base_monomers:
    - A
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 18
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 21
      charge: -1
  PUY:
    id: PUY
    name: puromycin
    synonyms:
    - (2S)-2-amino-N-[(2S,3S,4R,5R)-5-(6-dimethylaminopurin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl]-3-(4-methoxyphenyl)propanamide
    - 3'-deoxy-N,N-dimethyl-3'-[(O-methyl-L-tyrosyl)amino]adenosine
    - N
    identifiers:
    - ns: pdb-ccd
      id: PUY
    structure: OC[C@H]1O[C@H]([C@H]([C@H]1NC(=O)[C@H](Cc1ccc(cc1)OC)N)O)n1cnc2c1ncnc2N(C)C
  PYO:
    id: PYO
    name: 1-(beta-d-ribofuranosyl)-pyrimidin-2-one-5'-phosphate
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(2-oxopyrimidin-1-yl)oxolan-2-yl]methyl dihydrogen
      phosphate'
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)pyrimidin-2(1H)-one
    - U
    identifiers:
    - ns: pdb-ccd
      id: PYO
    structure: O[C@H]1[C@H](O)[C@H](O[C@@H]1n1cccnc1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 21
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 23
      charge: -1
  PYY:
    id: PYY
    name: d-ribofuranosyl-benzene-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5S)-3,4-dihydroxy-5-phenyl-oxolan-2-yl]methyl dihydrogen phosphate'
    - (1S)-1,4-anhydro-1-phenyl-5-O-phosphono-D-ribitol
    - N
    identifiers:
    - ns: pdb-ccd
      id: PYY
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1c1ccccc1)COP(=O)(O)O
  QUO:
    id: QUO
    name: 2-amino-7-deaza-(2'',3''-dihydroxy-cyclopentylamino)-guanosine-5'-monophosphate
    synonyms:
    - G
    - 2-amino-5-({[(1R,2S,3R)-2,3-dihydroxycyclopentyl]amino}methyl)-7-(5-O-phosphono-beta-D-ribofuranosyl)-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-one
    - '[(2R,3S,4R,5R)-5-[2-amino-5-[[[(1R,2S,3R)-2,3-dihydroxycyclopentyl]amino]methyl]-4-oxo-3H-pyrrolo[2,3-d]pyrimidin-7-yl]-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: QUO
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1cc(c2c1nc(N)[nH]c2=O)CN[C@@H]1CC[C@@H]([C@@H]1O)O)COP(=O)([O-])[O-]
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 38
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 41
      charge: -1
  RPC:
    id: RPC
    name: cytidine 3',5'-bis(dihydrogen phosphate)
    synonyms:
    - cytidine 3',5'-bis(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-azanyl-2-oxidanylidene-pyrimidin-1-yl)-4-oxidanyl-2-(phosphonooxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: RPC
    structure: O[C@@H]1[C@H](OP(=O)(O)O)[C@@H](O[C@H]1n1ccc(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
  RTP:
    id: RTP
    name: ribavirin triphosphate
    synonyms:
    - 1-{5-O-[(R)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]oxy}phosphoryl]-beta-D-ribofuranosyl}-1H-1,2,4-triazole-3-carboxamide
    - '[[(2R,3S,4R,5R)-5-(3-aminocarbonyl-1,2,4-triazol-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]
      phosphono hydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: RTP
    structure: O[C@H]1[C@@H](CO[P@@](=O)(O[P@@](=O)(OP(=O)(O)O)O)O)O[C@H]([C@H]1O)n1cnc(n1)C(=O)N
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  RUS:
    id: RUS
    name: 1-(5-o-phosphono-beta-d-ribofuranosyl)-2-selanylpyrimidin-4(1h)-one
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-bis(oxidanyl)-5-(4-oxidanylidene-2-selanyl-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-2-selanylpyrimidin-4(1H)-one
    identifiers:
    - ns: pdb-ccd
      id: RUS
    structure: O[C@@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(=O)nc1[SeH])COP(=O)(O)O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  RY:
    id: RY
    name: 5'-3,6-dihydrocytidylic acid
    synonyms:
    - 5'-3,6-dihydrocytidylic acid
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(6-azanyl-2-oxidanylidene-1,4-dihydropyrimidin-3-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: RY
    structure: NC1=CCN(C(=O)N1)[C@@H]1O[C@H]([C@@H]([C@@H]1O)O)COP(=O)(O)O
  S2M:
    id: S2M
    name: 2'-o-[2-(methoxy)ethyl]-2-thiothymidine-5'-monophosphate
    synonyms:
    - 1-[2-O-(2-methoxyethyl)-5-O-phosphono-beta-D-ribofuranosyl]-5-methyl-2-thioxo-2,3-dihydropyrimidin-4(1H)-one
    - T
    - '[(2R,3R,4R,5R)-3-hydroxy-4-(2-methoxyethoxy)-5-(5-methyl-4-oxo-2-sulfanylidene-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: S2M
    structure: COCCO[C@@H]1[C@@H](O)[C@H](O[C@H]1n1cc(C)c(=O)[nH]c1=S)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  S4C:
    id: S4C
    name: 4'-thio-4'-deoxy-cytosine-5'-monophosphate
    synonyms:
    - C
    - 4'-thiocytidine 5'-(dihydrogen phosphate)
    - '[(2R,3S,4R,5R)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-thiolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: S4C
    structure: O[C@H]1[C@@H](O)[C@@H](S[C@H]1n1ccc(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
  S8M:
    id: S8M
    name: (2~{r},3~{r},4~{s},5~{s})-2-(6-aminopurin-9-yl)-5-[[(3~{s})-3-azanyl-3-(1~{h}-1,2,3,4-tetrazol-5-yl)propyl]sulfanylmethyl]oxolane-3,4-diol
    synonyms:
    - (2~{R},3~{R},4~{S},5~{S})-2-(6-aminopurin-9-yl)-5-[[(3~{S})-3-azanyl-3-(1~{H}-1,2,3,4-tetrazol-5-yl)propyl]sulfanylmethyl]oxolane-3,4-diol
    identifiers:
    - ns: pdb-ccd
      id: S8M
    structure: O[C@@H]1[C@H](CSCC[C@@H](c2nnn[nH]2)N)O[C@@H]([C@H]1O)n1cnc2c1ncnc2N
  SMT:
    id: SMT
    name: 2'-[(methylthio)ethyloxy]-thymidine-5'-monophosphate
    synonyms:
    - 5-methyl-2'-O-[2-(methylsulfanyl)ethyl]uridine 5'-(dihydrogen phosphate)
    - T
    - '[(2R,3R,4R,5R)-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-(2-methylsulfanylethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: SMT
    structure: CSCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O
  SRA:
    id: SRA
    name: adenosine -5'-thio-monophosphate
    synonyms:
    - A
    - 5'-O-thiophosphonoadenosine
    - (2R,3R,4S,5R)-2-(6-aminopurin-9-yl)-5-(dihydroxyphosphinothioyloxymethyl)oxolane-3,4-diol
    identifiers:
    - ns: pdb-ccd
      id: SRA
    structure: O[C@H]1[C@H](O)[C@H](O[C@@H]1n1cnc2c1ncnc2N)COP(=S)([O-])[O-]
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 24
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 27
      charge: -1
  SSU:
    id: SSU
    name: uridine-5'-phosphorothioate
    synonyms:
    - 5'-O-thiophosphonouridine
    - 1-[(2R,3R,4S,5R)-5-(dihydroxyphosphinothioyloxymethyl)-3,4-dihydroxy-oxolan-2-yl]pyrimidine-2,4-dione
    - U
    identifiers:
    - ns: pdb-ccd
      id: SSU
    structure: O[C@@H]1[C@H](O)[C@@H](O[C@H]1n1ccc(=O)[nH]c1=O)COP(=S)(O)O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  SUR:
    id: SUR
    name: 1-(beta-d-ribofuranosyl)-2-thio-uracil-5'-phosphate
    synonyms:
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-2-thioxo-2,3-dihydropyrimidin-4(1H)-one
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(4-oxo-2-sulfanylidene-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: SUR
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(=O)[nH]c1=S)COP(=O)([O-])[O-]
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 26
      charge: -1
  T2T:
    id: T2T
    name: '[(2s,3s,5r)-3-[(2s)-3-({[(2r,3s,4r,5r)-3-hydroxy-4-methoxy-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)tetrahydrofuran-2-yl]methyl}amino)-2-methyl-3-oxopropyl]-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)tetrahydrofuran-2-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - '[(2S,3S,5R)-3-[(2S)-3-({[(2R,3R,4R,5R)-3-hydroxy-4-methoxy-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-2-yl]methyl}amino)-2-methyl-3-oxopropyl]-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-2-yl]methyl
      dihydrogen phosphate (non-preferred name)'
    - '[(2S,3S,5R)-3-[(2S)-3-[[(2R,3R,4R,5R)-3-hydroxy-4-methoxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methylamino]-2-methyl-3-oxo-propyl]-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: T2T
    structure: CO[C@H]1[C@@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)CNC(=O)[C@@H](C[C@@H]1C[C@@H](O[C@@H]1COP(=O)([O-])[O-])n1cc(C)c(=O)[nH]c1=O)C
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 7
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 40
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 7
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 43
      charge: -1
  T38:
    id: T38
    name: 2'-o-ethoxymethylene thymidine 5'-monophosphate
    synonyms:
    - 2'-O-(ethoxymethyl)-5-methyluridine 5'-(dihydrogen phosphate)
    - T
    - '[(2R,3R,4R,5R)-4-(ethoxymethoxy)-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: T38
    structure: CCOCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O
  T39:
    id: T39
    name: 2'-o-methoxyethylene thymidine 5'-monophosphate
    synonyms:
    - 2'-O-(2-methoxyethyl)-5-methyluridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-4-(2-methoxyethoxy)-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - T
    identifiers:
    - ns: pdb-ccd
      id: T39
    structure: COCCO[C@H]1[C@H](O)[C@@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)([O-])[O-]
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 10
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 28
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 10
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 31
      charge: -1
  T41:
    id: T41
    name: 1-(2-o-methyl-beta-d-arabinofuranosyl)thymidine 5'-monophosphate
    synonyms:
    - '[(2R,3R,4S,5R)-4-methoxy-5-[5-methyl-2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - T
    - 5-methyl-1-(2-O-methyl-5-O-phosphono-beta-D-arabinofuranosyl)pyrimidine-2,4(1H,3H)-dione
    identifiers:
    - ns: pdb-ccd
      id: T41
    structure: CO[C@H]1[C@H](O)[C@@H](O[C@H]1n1cc(C)c(=O)[nH]c1=O)COP(=O)(O)O
  T6A:
    id: T6A
    name: n-[n-(9-b-d-ribofuranosylpurin-6-yl)carbamoyl]threonine-5'-monophosphate
    synonyms:
    - A
    - (2S,3R)-2-{[(9-{(2R,3R,4S,5R)-3,4-dihydroxy-5-[(phosphonooxy)methyl]tetrahydrofuran-2-yl}-9H-purin-6-yl)carbamoyl]amino}-3-hydroxybutanoic
      acid (non-preferred name)
    - (2S,3R)-2-[[9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(phosphonooxymethyl)oxolan-2-yl]purin-6-yl]carbamoylamino]-3-hydroxy-butanoic
      acid
    identifiers:
    - ns: pdb-ccd
      id: T6A
    structure: O=C(Nc1ncnc2c1ncn2[C@H]1O[C@@H]([C@H]([C@H]1O)O)COP(=O)([O-])[O-])N[C@@H](C(=O)O)[C@@H](O)C
    base_monomers:
    - A
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 23
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 26
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 23
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 29
      charge: -1
  TAL:
    id: TAL
    name: 9-(6-deoxy-alpha-l-talofuranosyl)-6-methylpurine
    synonyms:
    - 9-(6-deoxy-alpha-L-talofuranosyl)-6-methyl-9H-purine
    - (2R,3S,4R,5R)-2-(1-hydroxyethyl)-5-(6-methylpurin-9-yl)oxolane-3,4-diol
    - N
    identifiers:
    - ns: pdb-ccd
      id: TAL
    structure: C[C@@H]([C@H]1O[C@H]([C@H]([C@H]1O)O)n1cnc2c1ncnc2C)O
  TFE:
    id: TFE
    name: 2'-o-[2-(trifluoro)ethyl] thymidine-5'-monophosphate
    synonyms:
    - '[(2R,3R,4R,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-4-(2,2,2-trifluoroethoxy)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 5-methyl-2'-O-(2,2,2-trifluoroethyl)uridine 5'-(dihydrogen phosphate)
    - T
    identifiers:
    - ns: pdb-ccd
      id: TFE
    structure: O[C@H]1[C@@H](COP(=O)([O-])[O-])O[C@H]([C@H]1OCC(F)(F)F)n1cc(C)c(=O)[nH]c1=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 11
      charge: -1
  TLB:
    id: TLB
    name: 2'-o,3'-c-methylene-arabinofuranosyl-thymine-5'-monophosphate
    synonyms:
    - '[(1R,2R,4R,5S)-1-hydroxy-4-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,6-dioxabicyclo[3.2.0]hept-2-yl]methyl
      dihydrogen phosphate'
    - '[(1R,2R,4R,5S)-1-hydroxy-4-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-3,6-dioxabicyclo[3.2.0]heptan-2-yl]methyl
      dihydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: TLB
    structure: O=c1[nH]c(=O)n(cc1C)[C@H]1O[C@@H]([C@]2([C@H]1OC2)O)COP(=O)(O)O
  TLN:
    id: TLN
    name: '[(1r,3r,4r,7s)-7-hydroxy-3-(thymin-1-yl)-2,5-dioxabicyclo[2.2.1]hept-1-yl]methyl
      dihydrogen phosphate'
    synonyms:
    - 1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}-5-methylpyrimidine-2,4(1H,3H)-dione
    - '[(1R,4R,5R,7S)-7-hydroxy-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)-3,6-dioxabicyclo[2.2.1]heptan-1-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: TLN
    structure: O[C@@H]1[C@H]2OC[C@]1(COP(=O)([O-])[O-])O[C@H]2n1cc(C)c(=O)[nH]c1=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 11
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  TPG:
    id: TPG
    name: 2,2,7-trimethyl-guanosine-5'-triphosphate-5'-guanosine
    synonyms:
    - '[[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]
      [(2R,3S,4R,5R)-5-(2-dimethylamino-7-methyl-6-oxo-1,8-dihydropurin-9-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      hydrogen phosphate'
    - G
    identifiers:
    - ns: pdb-ccd
      id: TPG
    structure: Nc1[nH]c(=O)c2c(n1)n(cn2)[C@H]1O[C@@H]([C@H]([C@H]1O)O)CO[P@@](=O)(O[P@@](=O)(O[P@@](=O)(OC[C@H]1O[C@@H]([C@H]([C@H]1O)O)N1CN(c2c1nc([nH]c2=O)N(C)C)C)O)O)O
    base_monomers:
    - G
  TYU:
    id: TYU
    name: tetrahydrouridine
    synonyms:
    - (4R)-4-hydroxy-1-beta-D-ribofuranosyltetrahydropyrimidin-2(1H)-one
    - (4R)-1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-4-hydroxy-1,3-diazinan-2-one
    - N
    identifiers:
    - ns: pdb-ccd
      id: TYU
    structure: OC[C@H]1O[C@H]([C@H]([C@H]1O)O)N1CC[C@@H](NC1=O)O
  U2L:
    id: U2L
    name: 5-methyl-3'-o-methoxyethyl uridine-5'-monophosphate
    synonyms:
    - '[(2R,3S,4R,5R)-4-hydroxy-3-(2-methoxyethoxy)-5-(5-methyl-2,4-dioxo-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 3'-O-(2-methoxyethyl)-5-methyluridine 5'-(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: U2L
    structure: COCCO[C@@H]1[C@@H](COP(=O)([O-])[O-])O[C@@H]([C@@H]1O)n1cc(C)c(=O)[nH]c1=O
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 12
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 14
      charge: -1
  U2P:
    id: U2P
    name: phosphoric acid mono-[2-(2,4-dioxo-3,4-dihydro-2h-pyrimidin-1-yl)-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-3-yl]
      ester
    synonyms:
    - '[(2R,3R,4R,5R)-2-(2,4-dioxopyrimidin-1-yl)-4-hydroxy-5-(hydroxymethyl)oxolan-3-yl]
      dihydrogen phosphate'
    - 2'-uridylic acid
    - U
    identifiers:
    - ns: pdb-ccd
      id: U2P
    structure: OC[C@H]1O[C@H]([C@H]([C@H]1O)OP(=O)(O)O)n1ccc(=O)[nH]c1=O
    base_monomers:
    - U
  U31:
    id: U31
    name: 2'-o-3-aminopropyl 2'-deoxyuridine-5'-monophosphate
    synonyms:
    - 2'-O-(3-aminopropyl)uridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-4-(3-aminopropoxy)-5-(2,4-dioxopyrimidin-1-yl)-3-hydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: U31
    structure: NCCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
  U34:
    id: U34
    name: uridine 5'-monomethylphosphate
    synonyms:
    - 1-[(6S)-5-deoxy-6-C-phosphono-beta-D-ribo-hexofuranosyl]pyrimidine-2,4(1H,3H)-dione
    - '[2-[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]-1-hydroxy-ethyl]phosphonic
      acid'
    - U
    identifiers:
    - ns: pdb-ccd
      id: U34
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)C[C@H](P(=O)(O)O)O
    base_monomers:
    - U
  U36:
    id: U36
    name: 2'-o-methyoxyethyl-uridine-5'-monophosphate
    synonyms:
    - 2'-O-(2-methoxyethyl)uridine 5'-(dihydrogen phosphate)
    - '[(2R,3R,4R,5R)-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-(2-methoxyethoxy)-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: U36
    structure: COCCO[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 27
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 30
      charge: -1
  U37:
    id: U37
    name: uridine 5'-monothiophosphate
    synonyms:
    - 5'-O-thiophosphonouridine
    - '[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methoxy-sulfanyl-phosphinic
      acid'
    - U
    identifiers:
    - ns: pdb-ccd
      id: U37
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)CO[P@](=O)(S)O
    base_monomers:
    - U
  U4M:
    id: U4M
    name: 1-{2,5-dideoxy-2-fluoro-4-[(phosphonooxy)methyl]-alpha-l-lyxofuranosyl}pyrimidine-2,4(1h,3h)-dione
    synonyms:
    - 1-{2,5-dideoxy-2-fluoro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}pyrimidine-2,4(1H,3H)-dione
    - '[(2~{R},3~{R},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-fluoranyl-2-methyl-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: U4M
    structure: F[C@@H]1[C@H](O[C@@]([C@@H]1O)(C)CO[P@@](=O)(O)[O-])n1ccc(=O)[nH]c1=O
  U5M:
    id: U5M
    name: 1-(2,6-dideoxy-2-fluoro-5-o-phosphono-alpha-l-talofuranosyl)pyrimidine-2,4(1h,3h)-dione
    synonyms:
    - 1-(2,6-dideoxy-2-fluoro-5-O-phosphono-alpha-L-talofuranosyl)pyrimidine-2,4(1H,3H)-dione
    - '[(1S)-1-[(2S,3R,4R,5R)-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-fluoranyl-3-oxidanyl-oxolan-2-yl]ethyl]
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: U5M
    structure: C[C@H]([C@H]1O[C@@H]([C@H]([C@H]1O)F)n1ccc(=O)[nH]c1=O)OP(=O)(O)O
  UAR:
    id: UAR
    name: uracil arabinose-5'-phosphate
    synonyms:
    - 1-(5-O-phosphono-beta-D-arabinofuranosyl)pyrimidine-2,4(1H,3H)-dione
    - '[(2R,3S,4S,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - U
    identifiers:
    - ns: pdb-ccd
      id: UAR
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)COP(=O)([O-])[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 23
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 25
      charge: -1
  UBD:
    id: UBD
    name: uridine 3',5'-bis(dihydrogen phosphate)
    synonyms:
    - '[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-4-hydroxy-3-phosphonooxy-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - uridine 3',5'-bis(dihydrogen phosphate)
    - U
    identifiers:
    - ns: pdb-ccd
      id: UBD
    structure: O[C@H]1[C@H](OP(=O)(O)O)[C@H](O[C@@H]1n1ccc(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
  UD5:
    id: UD5
    name: 5-fluorouridine
    synonyms:
    - 5'-O-(dihydroxyphosphanyl)-5-fluorouridine
    - '[(2R,3S,4R,5R)-5-(5-fluoro-2,4-dioxo-pyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      dihydrogen phosphite'
    - U
    identifiers:
    - ns: pdb-ccd
      id: UD5
    structure: OP(OC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cc(F)c(=O)[nH]c1=O)O
    base_monomers:
    - U
  UDP:
    id: UDP
    name: uridine-5'-diphosphate
    synonyms:
    - uridine 5'-(trihydrogen diphosphate)
    - '[(2R,3S,4R,5R)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-oxolan-2-yl]methyl
      phosphono hydrogen phosphate'
    - N
    identifiers:
    - ns: pdb-ccd
      id: UDP
    structure: O[C@@H]1[C@H](CO[P@](=O)(OP(=O)(O)O)O)O[C@H]([C@H]1O)n1ccc(=O)[nH]c1=O
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
  UFB:
    id: UFB
    name: 2'-f,4'-beta-ome uridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2S,3R,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-4-fluoro-3-hydroxy-2-methoxytetrahydrofuran-2-yl]methyl
      dihydrogen phosphate (non-preferred name)'
    - '[(2~{S},3~{R},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-fluoranyl-2-methoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: UFB
    structure: CO[C@@]1(CO[P@](=O)(O)[O-])O[C@H]([C@H]([C@@H]1O)F)n1ccc(=O)[nH]c1=O
  UOA:
    id: UOA
    name: '[(2r,3s,4r,5r)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-3-hydroxy-2,4-dimethoxytetrahydrofuran-2-yl]methyl
      dihydrogen phosphate (non-preferred name)'
    synonyms:
    - '[(2~{R},3~{S},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-2,4-dimethoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - '[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3-hydroxy-2,4-dimethoxytetrahydrofuran-2-yl]methyl
      dihydrogen phosphate (non-preferred name)'
    identifiers:
    - ns: pdb-ccd
      id: UOA
    structure: CO[C@H]1[C@@H](O[C@@]([C@@H]1O)(OC)CO[P@](=O)(O)[O-])n1ccc(=O)[nH]c1=O
  UOB:
    id: UOB
    name: 2'-ome,4'beta-ome uridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2~{S},3~{S},4~{R},5~{R})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-2,4-dimethoxy-3-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - '[(2S,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3-hydroxy-2,4-dimethoxytetrahydrofuran-2-yl]methyl
      dihydrogen phosphate (non-preferred name)'
    identifiers:
    - ns: pdb-ccd
      id: UOB
    structure: CO[C@@H]1[C@H](O[C@]([C@H]1O)(OC)CO[P@](=O)(O)[O-])n1ccc(=O)[nH]c1=O
  UPV:
    id: UPV
    name: 2'-o-{[(2,2-dimethylpropanoyl)oxy]methyl}uridine 5'-(dihydrogen phosphate)
    synonyms:
    - '[(2R,3R,4R,5R)-2-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-4-oxidanyl-5-(phosphonooxymethyl)oxolan-3-yl]oxymethyl
      2,2-dimethylpropanoate'
    - 2'-O-{[(2,2-dimethylpropanoyl)oxy]methyl}uridine 5'-(dihydrogen phosphate)
    identifiers:
    - ns: pdb-ccd
      id: UPV
    structure: O[C@H]1[C@H](COP(=O)([O-])[O-])O[C@@H]([C@H]1OCOC(=O)C(C)(C)C)n1ccc(=O)[nH]c1=O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 1
    l_bond_atoms:
    - molecule: Monomer
      element: P
      position: 8
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 1
    l_displaced_atoms:
    - molecule: Monomer
      element: O
      position: 10
      charge: -1
  URD:
    id: URD
    name: 1-((2r,3r,4s,5r)-tetrahydro-3,4-dihydroxy-5-(hydroxymethyl)furan-2-yl)pyridine-2,4(1h,3h)-dione
    synonyms:
    - 1-beta-D-ribofuranosylpyridine-2,4(1H,3H)-dione
    - 1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyridine-2,4-dione
    - U
    identifiers:
    - ns: pdb-ccd
      id: URD
    structure: OC[C@H]1O[C@H]([C@H]([C@H]1O)O)N1C=CC(=O)CC1=O
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  URU:
    id: URU
    name: ((2s,3s,4r,5r)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-3-(2- ((((2r,5r)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2h)-yl)-
      3,4-dihydroxytetrahydrofuran-2-yl)methyl)amino)-2-oxoethyl)-4- hydroxytetrahydrofuran-2-yl)methyl
      phosphate
    synonyms:
    - '[(2S,3S,4R,5R)-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-3-[2-[[(2R,3S,4R,5R)-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methylamino]-2-oxidanylidene-ethyl]-4-oxidanyl-oxolan-2-yl]methyl
      dihydrogen phosphate'
    - '{(2S,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3-[2-({[(2R,3S,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-3,4-dihydroxytetrahydrofuran-2-yl]methyl}amino)-2-oxoethyl]-4-hydroxytetrahydrofuran-2-yl}methyl
      dihydrogen phosphate (non-preferred name)'
    identifiers:
    - ns: pdb-ccd
      id: URU
    structure: O=C(C[C@@H]1[C@@H](COP(=O)(O)O)O[C@@H]([C@H]1O)n1ccc(=O)[nH]c1=O)NC[C@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1ccc(=O)[nH]c1=O
  US5:
    id: US5
    name: 1-(5-o-phosphono-beta-d-ribofuranosyl)-4-selanylpyrimidin-2(1h)-one
    synonyms:
    - '[(2R,3S,4R,5R)-3,4-dihydroxy-5-(2-oxo-4-selanyl-pyrimidin-1-yl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-4-selanylpyrimidin-2(1H)-one
    - U
    identifiers:
    - ns: pdb-ccd
      id: US5
    structure: O[C@H]1[C@@H](O)[C@H](O[C@H]1n1ccc(nc1=O)[SeH])CO[P@@](=O)(O)[O-]
    base_monomers:
    - U
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 6
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 6
  XTS:
    id: XTS
    name: 9-[(2r,3r,4s,5r)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-3h-purine-2,6-dione
    synonyms:
    - xanthosine
    - G
    - 9-[(2S,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-3H-purine-2,6-dione
    identifiers:
    - ns: pdb-ccd
      id: XTS
    structure: OC[C@@H]1O[C@@H]([C@@H]([C@@H]1O)O)n1cnc2c1[nH]c(=O)[nH]c2=O
    base_monomers:
    - G
    r_bond_atoms:
    - molecule: Monomer
      element: O
      position: 12
    r_displaced_atoms:
    - molecule: Monomer
      element: H
      position: 12
  Y5P:
    id: Y5P
    name: 1-(5-o-phosphono-beta-d-ribofuranosyl)-1,4-dihydropyrimidine
    synonyms:
    - 1-(5-O-phosphono-beta-D-ribofuranosyl)-1,4-dihydropyrimidine
    - '[(2R,3S,4R,5R)-3,4-bis(oxidanyl)-5-(4H-pyrimidin-1-yl)oxolan-2-yl]methyl dihydrogen
      phosphate'
    identifiers:
    - ns: pdb-ccd
      id: Y5P
    structure: O[C@@H]1[C@H](O)[C@H](O[C@@H]1N1C=CCN=C1)COP(=O)(O)O
  ZAD:
    id: ZAD
    name: (s)-1'-(2',3'-dihydroxypropyl)-adenine
    synonyms:
    - A
    - '[(2S)-3-(6-aminopurin-9-yl)-2-hydroxy-propyl] dihydrogen phosphate'
    - (2S)-3-(6-amino-9H-purin-9-yl)-2-hydroxypropyl dihydrogen phosphate
    identifiers:
    - ns: pdb-ccd
      id: ZAD
    structure: O[C@@H](Cn1cnc2c1ncnc2N)COP(=O)(O)O
    base_monomers:
    - A
  ZBC:
    id: ZBC
    name: (2s)-3-(4-amino-5-bromo-2-oxopyrimidin-1(2h)-yl)-2-hydroxypropyl dihydrogen
      phosphate
    synonyms:
    - C
    - '[(2S)-3-(4-amino-5-bromo-2-oxo-pyrimidin-1-yl)-2-hydroxy-propyl] dihydrogen
      phosphate'
    - (2S)-3-(4-amino-5-bromo-2-oxopyrimidin-1(2H)-yl)-2-hydroxypropyl dihydrogen
      phosphate
    identifiers:
    - ns: pdb-ccd
      id: ZBC
    structure: O[C@H](Cn1cc(Br)c(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
  ZBU:
    id: ZBU
    name: (s)-1'-(2',3'-dihydroxypropyl)-5-bromo-uracil
    synonyms:
    - '[(2S)-3-(5-bromo-2,4-dioxo-pyrimidin-1-yl)-2-hydroxy-propyl] dihydrogen phosphate'
    - (2S)-3-(5-bromo-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-2-hydroxypropyl dihydrogen
      phosphate
    - U
    identifiers:
    - ns: pdb-ccd
      id: ZBU
    structure: O[C@@H](Cn1cc(Br)c(=O)[nH]c1=O)COP(=O)(O)O
    base_monomers:
    - U
  ZCY:
    id: ZCY
    name: (s)-1'-(2',3'-dihydroxypropyl)-cytosine
    synonyms:
    - C
    - (2S)-3-(4-amino-2-oxopyrimidin-1(2H)-yl)-2-hydroxypropyl dihydrogen phosphate
    - '[(2S)-3-(4-amino-2-oxo-pyrimidin-1-yl)-2-hydroxy-propyl] dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: ZCY
    structure: O[C@H](Cn1ccc(nc1=O)N)COP(=O)(O)O
    base_monomers:
    - C
  ZGU:
    id: ZGU
    name: (s)-1'-(2',3'-dihydroxypropyl)-guanine
    synonyms:
    - G
    - (2S)-3-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)-2-hydroxypropyl dihydrogen
      phosphate
    - '[(2S)-3-(2-amino-6-oxo-1H-purin-9-yl)-2-hydroxy-propyl] dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: ZGU
    structure: O[C@@H](Cn1cnc2c1nc(N)[nH]c2=O)COP(=O)(O)O
    base_monomers:
    - G
  ZHP:
    id: ZHP
    name: (s)-1'-(2',3'-dihydroxypropyl)-hydroxypyridone
    synonyms:
    - '[(2S)-2-hydroxy-3-(3-hydroxy-2-methyl-4-oxo-pyridin-1-yl)propyl] dihydrogen
      phosphate'
    - (2S)-2-hydroxy-3-(3-hydroxy-2-methyl-4-oxopyridin-1(4H)-yl)propyl dihydrogen
      phosphate
    - N
    identifiers:
    - ns: pdb-ccd
      id: ZHP
    structure: O[C@@H](Cn1ccc(=O)c(c1C)O)COP(=O)(O)O
  9V9:
    id: 9V9
    name: 1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-l-lyxofuranosyl}-5-methyl-2-sulfanylidene-2,3-dihydropyrimidin-4(1h)-one
    synonyms:
    - '[(1~{R},3~{R},4~{R},7~{S})-3-(5-methyl-4-oxidanylidene-2-sulfanylidene-pyrimidin-1-yl)-7-oxidanyl-2,5-dioxabicyclo[2.2.1]heptan-1-yl]methyl
      dihydrogen phosphate'
    - 1-{2,5-anhydro-4-[(phosphonooxy)methyl]-alpha-L-lyxofuranosyl}-5-methyl-2-sulfanylidene-2,3-dihydropyrimidin-4(1H)-one
    identifiers:
    - ns: pdb-ccd
      id: 9V9
    structure: O[C@@H]1[C@@H]2OC[C@@]1(COP(=O)(O)O)O[C@H]2n1cc(C)c(=O)[nH]c1=S
  JMH:
    id: JMH
    name: 3-methylcytidine- 5'-monophosphate
    synonyms:
    - C
    - '[(2~{R},3~{S},4~{R},5~{R})-5-(4-azanylidene-3-methyl-2-oxidanylidene-pyrimidin-1-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methyl
      dihydrogen phosphate'
    identifiers:
    - ns: pdb-ccd
      id: JMH
    structure: O[C@@H]1[C@@H](O)[C@@H](O[C@H]1n1ccc(=N)n(c1=O)C)COP(=O)(O)O
    base_monomers:
    - C
  TC:
    id: TC
    name: 4-azanyl-1-[(2~{r},3~{r},4~{s})-3-oxidanyl-4-[oxidanyl-bis(oxidanylidene)-$l^{6}-phosphanyl]oxy-oxolan-2-yl]pyrimidin-2-one
    synonyms:
    - 4-azanyl-1-[(2~{R},3~{R},4~{S})-3-oxidanyl-4-[oxidanyl-bis(oxidanylidene)-$l^{6}-phosphanyl]oxy-oxolan-2-yl]pyrimidin-2-one
    identifiers:
    - ns: pdb-ccd
      id: TC
    structure: O[C@@H]1[C@H](CO[C@@H]1n1ccc(nc1=O)N)OP(=O)(=O)O
    base_monomers:
    - C
  TG:
    id: TG
    name: 2-azanyl-9-[(2~{r},3~{r},4~{s})-3-oxidanyl-4-[oxidanyl-bis(oxidanylidene)-$l^{6}-phosphanyl]oxy-oxolan-2-yl]-1~{h}-purin-6-one
    synonyms:
    - 2-azanyl-9-[(2~{R},3~{R},4~{S})-3-oxidanyl-4-[oxidanyl-bis(oxidanylidene)-$l^{6}-phosphanyl]oxy-oxolan-2-yl]-1~{H}-purin-6-one
    identifiers:
    - ns: pdb-ccd
      id: TG
    structure: O[C@H]1[C@@H](CO[C@@H]1n1cnc2c1nc(N)[nH]c2=O)OP(=O)(=O)O
    base_monomers:
    - G