SMILES: CC1=CC(=O)OC1CC(=O)[O-]
Description: The molecule is a monocarboxylic acid anion that is the conjugate base of 4-carboxymethyl-3-methylbut-2-en-1,4-olide; major species at pH 7.3. It is a conjugate base of a 4-carboxymethyl-3-methylbut-2-en-1,4-olide.