The molecule is a tricarboxylic acid trianion obtained by deprotonation of the three carboxy groups of (2R,3E)-5-oxopent-3-ene-1,2,5-tricarboxylic acid; major species at pH 7.3. It is a conjugate base of a (2R,3E)-5-oxopent-3-ene-1,2,5-tricarboxylic acid.
(E,2R)-5-oxopent-3-ene-1,2,5-tricarboxylate