The molecule is an S-substituted N-acetyl-L-cysteine arising from formal 1,4-addition of the side-chain sulfur atom to N-ethylmaleimide. It is a S-substituted N-acetyl-L-cysteine and an organic sulfide. It derives from a N-ethylsuccinimide.
(2R)-2-acetamido-3-(1-ethyl-2,5-dioxopyrrolidin-3-yl)sulfanylpropanoic acid