The molecule is a 4-carboxy-2-hydroxyhexa-2,4-dienedioic acid having (2Z,4E)-configuration about the C=C double bonds. It is a conjugate acid of a (2Z,4E)-4-carboxylato-2-hydroxyhexa-2,4-dienedioate(3-).
(1E,3Z)-4-hydroxybuta-1,3-diene-1,2,4-tricarboxylic acid