L-Cysteine, N-acetyl-, methylcarbamate (ester) (9CI); N-Acetyl-S-[(methylamino)carbonyl]-L-cysteine (ACI); (2R)-2-Acetamido-3-[(methylcarbamoyl)sulfanyl]propanoic acid; (R)-2-Acetamido-3-((methylcarbamoyl)thio)propanoic acid; N-Acetyl-S-(N-methylcarbamoyl)cysteine,L-cysteine Metabolite