The molecule is the 5-oxo monocarboxylic acid anion resulting from the removal of the proton from the carboxylic acid group of 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoic acid. It is a conjugate base of a 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoic acid. It is a tautomer of a 2,6-dioxo-6-phenylhexa-3-enoate(1-).
(1E,3E)-6-hydroxy-5,6-dioxo-1-phenylhexa-1,3-dien-1-olate