SMILES: C\\1=CC(=O)O/C1=C\\C(=O)C(=O)[O-]
Description: The molecule is a 2-oxo monocarboxylic acid anion that is the conjugate base of 2-oxo-3-(5-oxofuran-2-ylidene)propanoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a 2-oxo-3-(5-oxofuran-2-ylidene)propanoic acid.