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基于 PubChem CID 索引，支持名称 / 同义词 / CAS / SMILES 检索。
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5-[(3-carboxy-4-oxidanylidene-cyclohexa-2,5-dien-1-ylidene)-(3-carboxy-4-oxidanyl-phenyl)methyl]-2-oxidanyl-benzoic acid CAS 4431-00-9 PubChem CID 2259
O=C(O)C1=CC(=C(c2ccc(O)c(C(=O)O)c2)c2ccc(O)c(C(=O)O)c2)C=CC1=O -
5-[(3-carboxy-4-hydroxy-phenyl)-(3-carboxy-4-oxo-cyclohexylidene)methyl]-2-hydroxy-benzoic Acid CAS 4431-00-9 PubChem CID 4379851
O=C(O)c1cc(C(=C2CCC(=O)C(C(=O)O)C2)c2ccc(O)c(C(=O)O)c2)ccc1O