SMILES: C(=C/C(=C(\\C(=O)O)/[O-])/C(=O)[O-])\\C=O
Description: The molecule is a dicarboxylic acid dianion arising from deprotonation of both carboxy groups of 2-hydroxy-3-(3-oxoprop-1-enyl)but-2-enedioic acid; major species at pH 7.3. It is a conjugate base of a 2-hydroxy-3-(3-oxoprop-1-enyl)but-2-enedioic acid.