N-Acetyl-S-(trichlorovinyl)-L-cysteine

N-Acetyl-S-(trichlorovinyl)-L-cysteine is a thiol-containing cysteine derivative featuring an N-acetyl group and a trichlorovinyl moiety attached to the sulfur atom. Its structure incorporates a chiral L-configuration, a deprotonated thiolate group, and a conjugated trichloroethylene framework. This compound arises as a specific degradation byproduct of related organochlorine-containing pharmaceuticals. It serves as a critical HPLC reference standard for quantifying process-related impurities in acetylcysteine-based drug substances.