The molecule is an aldehydic acid anion resulting from the deprotonation of the carboxy group of (2Z,4E)-4-hydroxymuconic semialdehyde. It is a 6-oxo monocarboxylic acid anion and an aldehydic acid anion. It is a conjugate base of a (2Z,4E)-4-hydroxymuconic semialdehyde.
(1E,4Z)-6-hydroxy-3,6-dioxohexa-1,4-dien-1-olate