 | | OC1 | | 表記: | CALCIUM ION, 1 WATER COORDINATED | | 組成式: | Ca H2 O | | SMILES: | O|[Ca++] | | InChi: | InChI=1/Ca.H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC2 | | 表記: | CALCIUM ION, 2 WATERS COORDINATED | | 組成式: | Ca H4 O2 | | SMILES: | O|[Ca++]|O | | InChi: | InChI=1/Ca.2H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC3 | | 表記: | CALCIUM ION, 3 WATERS COORDINATED | | 組成式: | Ca H6 O3 | | SMILES: | O|[Ca++](|O)|O | | InChi: | InChI=1/Ca.3H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC4 | | 表記: | CALCIUM ION, 4 WATERS COORDINATED | | 組成式: | Ca H8 O4 | | SMILES: | O|[Ca++](|O)(|O)|O | | InChi: | InChI=1/Ca.4H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC5 | | 表記: | CALCIUM ION, 5 WATERS COORDINATED | | 組成式: | Ca H10 O5 | | SMILES: | O|[Ca++](|O)(|O)(|O)|O | | InChi: | InChI=1/Ca.5H2O/h | | 定義日: | 1999-07-14 | | 最終更新日: | 2008-10-14 |
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 | | OC6 | | 表記: | CALCIUM ION, 6 WATERS COORDINATED | | 組成式: | Ca H12 O6 | | SMILES: | O|[Ca++](|O)(|O)(|O)(|O)|O | | InChi: | InChI=1/Ca.6H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC7 | | 表記: | CALCIUM ION, 7 WATERS COORDINATED | | 組成式: | Ca H14 O7 | | SMILES: | O|[Ca++](|O)(|O)(|O)(|O)(|O)|O | | InChi: | InChI=1/Ca.7H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OC8 | | 表記: | CALCIUM ION, 8 WATERS COORDINATED | | 組成式: | Ca H16 O8 | | SMILES: | O|[Ca++](|O)(|O)(|O)(|O)(|O)(|O)|O | | InChi: | InChI=1/Ca.8H2O/h | | 定義日: | 2004-03-10 | | 最終更新日: | 2008-10-14 |
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 | | OCL | | 表記: | COBALT ION, 1 WATER COORDINATED | | 組成式: | Co H2 O | | SMILES: | O|[Co++] | | InChi: | InChI=1/Co.H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OCM | | 表記: | COBALT ION, 3 WATERS COORDINATED | | 組成式: | Co H6 O3 | | SMILES: | O|[Co++](|O)|O | | InChi: | InChI=1/Co.3H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OCN | | 表記: | COBALT ION, 2 WATERS COORDINATED | | 組成式: | Co H4 O2 | | SMILES: | O|[Co++]|O | | InChi: | InChI=1/Co.2H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | OCO | | 表記: | COBALT ION,6 WATERS COORDINATED | | 組成式: | Co H12 O6 | | SMILES: | O|[Co+3](|O)(|O)(|O)(|O)|O | | InChi: | InChI=1/Co.6H2O/h | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 |
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 | | HHP | | 表記: | 6-HYDROXYMETHYL-7,8-DIHYDROPTERIN | | 組成式: | C7 H9 N5 O2 | | SMILES: | O=C1NC(=NC=2NCC(=NC1=2)CO)N | | InChi: | InChI=1/C7H9N5O2/c8-7-11-5-4(6(14)12-7)10-3(2-13)1-9-5/h13H,1-2H2,(H4,8,9,11,12,14)/f/h9,12H,8H2 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | 2-amino-6-(hydroxymethyl)-7,8-dihydropteridin-4(3H)-one |
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 | | OET | | 表記: | ETHYL GROUP | | 組成式: | C2 H5 | | SMILES: | CC | | InChi: | InChI=1/C2H6/c1-2/h1-2H3 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | ethane |
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 | | OF1 | | 表記: | FERROUS ION, 1 WATER COORDINATED | | 組成式: | Fe H2 O | | SMILES: | O|[Fe++] | | InChi: | InChI=1/Fe.H2O/h | | 定義日: | 1999-07-13 | | 最終更新日: | 2008-10-14 |
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 | | OF2 | | 表記: | 2 FERRIC ION, 1 BRIDGING OXYGEN | | 組成式: | Fe2 O | | SMILES: | [Fe+3]O[Fe+3] | | InChi: | InChI=1/2Fe.O/q2*+3 | | 定義日: | 2001-12-10 | | 最終更新日: | 2008-10-14 |
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 | | OF3 | | 表記: | FERRIC ION, 1 WATER COORDINATED | | 組成式: | Fe H2 O | | SMILES: | O|[Fe+3] | | InChi: | InChI=1/Fe.H2O/h | | 定義日: | 2000-03-01 | | 最終更新日: | 2008-10-14 |
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 | | OHE | | 表記: | HYDROXYETHYL GROUP | | 組成式: | C2 H6 O | | SMILES: | OCC | | InChi: | InChI=1/C2H6O/c1-2-3/h3H,2H2,1H3 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | ethanol |
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 | | HMP | | 表記: | 1-HYDROXYAMINE-2-ISOBUTYLMALONIC ACID | | 組成式: | C7 H13 N O4 | | SMILES: | O=C(NO)C(C(=O)O)CC(C)C | | InChi: | InChI=1/C7H13NO4/c1-4(2)3-5(7(10)11)6(9)8-12/h4-5,12H,3H2,1-2H3,(H,8,9)(H,10,11)/t5-/m1/s1/f/h8,10H | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | (2R)-2-(hydroxycarbamoyl)-4-methylpentanoic acid |
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 | | OX | | 表記: | BOUND OXYGEN | | 組成式: | O | | SMILES: | O | | InChi: | InChI=1/H2O/h1H2 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | water |
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 | | OXA | | 表記: | OXYDIMETHYLENE GROUP | | 組成式: | C2 H5 O | | SMILES: | OCC | | InChi: | InChI=1/C2H6O/c1-2-3/h3H,2H2,1H3 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | ethanol |
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 | | OXO | | 表記: | OXO GROUP | | 組成式: | O | | SMILES: | O | | InChi: | InChI=1/H2O/h1H2 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | water |
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 | | HNP | | 表記: | HYDANTOCIDIN-5'-MONOPHOSPHATE | | 組成式: | C7 H11 N2 O9 P | | SMILES: | O=C2NC(=O)NC21OC(C(O)C1O)COP(=O)(O)O | | InChi: | InChI=1/C7H11N2O9P/c10-3-2(1-17-19(14,15)16)18-7(4(3)11)5(12)8-6(13)9-7/h2-4,10-11H,1H2,(H2,14,15,16)(H2,8,9,12,13)/t2-,3-,4-,7+/m1/s1/f/h8-9,14-15H | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | [(5S,7R,8S,9R)-8,9-dihydroxy-2,4-dioxo-6-oxa-1,3-diazaspiro[4.4]non-7-yl]methyl dihydrogen phosphate |
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 | | H | | 表記: | ETNAM H HYDROGEN ATOM | | 組成式: | H | | SMILES: | [H+] | | InChi: | InChI=1/H2/h1H | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | hydron |
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 | | HP3 | | 表記: | 2,3-PROPANDIOL | | 組成式: | C3 H8 O2 | | SMILES: | OCC(O)C | | InChi: | InChI=1/C3H8O2/c1-3(5)2-4/h3-5H,2H2,1H3/t3-/m1/s1 | | 定義日: | 1999-07-08 | | 最終更新日: | 2008-10-14 | | 識別子（ID）: | (2R)-propane-1,2-diol |
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