SMILES: C1=C(OC(=C1C(=O)[O-])CC(=O)[O-])[O-]
Description: The molecule is trianion of 2-(carboxymethyl)-5-oxo-2,5-dihydro-3-furoic acid arising from deprotonation of the two carboxy groups as well as removal of the acidic proton at C2; major species at pH 7.3. It is a conjugate base of a 2-(carboxymethyl)-5-oxo-2,5-dihydro-3-furoic acid.