1-Hacb 1-Hydroxy-2-(N-acetylcysteinyl)-3-butene 1-Hydroxy-2-(N-acetylcysteinyl-S-)-3-butene 144889-51-0 L-Cysteine, N-acetyl-S-(1-(hydroxymethyl)-2-propenyl)- N-Acetyl-S-(1-(hydroxymethyl)-2-propenyl)-L-cysteine