The molecule is a 2-oxo monocarboxylic acid anion that is the conjugate base of (3S)-3-methyl-2-oxo-3-phenylpropanoic acid, obtained by deprotonation of the carboxy group. It is a conjugate base of a (3S)-3-methyl-2-oxo-3-phenylpropanoic acid.
(3S)-2-oxo-3-phenylbutanoate