SMILES: C(=C/C(=O)O)\\C(=O)/C=C/[O-]
Description: The molecule is a 6-oxo monocarboxylic acid anion that is the conjugate base of (2E,4Z)-4-hydroxy-6-oxohexa-2,4-dienoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a (2E,4Z)-4-hydroxy-6-oxohexa-2,4-dienoic acid.