SMILES: C(/C=C/C(=O)C(=O)O)C(=O)O
Description: The molecule is the oxo dicarboxylic acid that is hex-3-enedioic acid oxo-substituted at C-2; the stereochemistry of the C=C double bond is unspecified. It is a conjugate acid of a 2-oxohex-3-enedioate.