The molecule is a tricarboxylic acid trianion resulting from deprotonation of the three carboxy groups of (2Z,4E)-4-carboxy-2-hydroxyhexa-2,4-dienedioic acid. It is a conjugate base of a (2Z,4E)-4-carboxy-2-hydroxyhexa-2,4-dienedioic acid.
(Z,4E)-4-(carboxymethylidene)-2-oxidopent-2-enedioate