The molecule is a tricarboxylic acid trianion resulting from deprotonation of the three carboxy groups of 4-carboxy-2-hydroxy-cis,cis-muconic acid; major species at pH 7.3. It is a conjugate base of a 4-carboxy-2-hydroxy-cis,cis-muconic acid.
(E,4E)-4-(carboxymethylidene)-2-oxidopent-2-enedioate