The molecule is a tricarboxylic acid that is pent-3-ene-1,2,5-tricarboxylic acid carrying an oxo substituent at position 5 (the 2R,3E-stereoisomer). It is a conjugate acid of a (2R,3E)-5-oxopent-3-ene-1,2,5-tricarboxylate.
(E,2R)-5-oxopent-3-ene-1,2,5-tricarboxylic acid