(2Z,4E)-2-hydroxy-5-methyl-6-oxohexa-2,4-dienoate
(2z,4e)-2-hydroxy-5-methyl-6-oxohexa-2,4-dienoate
A 6-oxo monocarboxylic acid anion resulting from the deprotonation of the carboxy group of (2<i>Z</i>,4<i>E</i>)-2-hydroxy-5-methyl-6-oxohexa-2,4-dienoic acid. The major species at pH 7.3.