The molecule is a 2-(omega-methylthio)alkylmaleate(2-) obtained by deprotonation of both carboxy groups of 2-(2-methylthio)ethylmaleic acid; major species at pH 7.3. It is a conjugate base of a 2-(2-methylthio)ethylmaleic acid.
(Z)-2-(2-methylsulfanylethyl)but-2-enedioate