N-Acetyl-L-cysteine-13C3,15N

N-Acetyl-L-cysteine-13C3,15N is an intermediate used in the synthesis of N-Acetyl-S-(N-methylcarbamoyl)-L-cysteine 1,2,3-13C3,15N (A186622), which is labelled N-Acetyl-S-(N-methylcarbamoyl)-L-cysteine (A186625), which is a urinary metabolite of the hepatotoxic experimental antitumour agent N-Methylformamide (NSC 3051) in mouse, rat and man.