SMILES: C(/C=C/C=C(/C(=O)O)\\[O-])C(=O)[O-]
Description: The molecule is a dicarboxylic acid dianion obtained by deprotonation of the carboxy groups of 2-hydroxyhepta-2,4-dienedioic acid; major species at pH 7.3. It is a conjugate base of a 2-hydroxyhepta-2,4-dienedioic acid. It is a tautomer of a 2-oxohept-4-ene-1,7-dioate.