(2E,4Z)-4-hydroxy-6-oxohexa-2,4-dienoate
(2e,4z)-4-hydroxy-6-oxohexa-2,4-dienoate
A 6-oxo monocarboxylic acid anion that is the conjugate base of (2<i>E</i>,4<i>Z</i>)-4-hydroxy-6-oxohexa-2,4-dienoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3.