The molecule is the trans-isomer of 2-chloro-4-carboxymethylenebut-2-en-1,4-olide. It is a 2-chloro-4-carboxymethylenebut-2-en-1,4-olide and a chlorodienelactone. It derives from a trans-4-carboxymethylenebut-2-en-4-olide. It is a conjugate acid of a trans-2-chloro-4-carboxylatomethylenebut-2-en-1,4-olide(1-).
(2Z)-2-(4-chloro-5-oxofuran-2-ylidene)acetic acid