The molecule is an oxo dicarboxylate obtained by deprotonation of both carboxy groups of 2,5-dichloro-4-oxohex-2-enedioic acid. It derives from a 4-oxohex-2-enedioate. It is a conjugate base of a 2,5-dichloro-4-oxohex-2-enedioic acid.
(Z)-2,5-dichloro-4-oxohex-2-enedioate