Synonyms: L-Cysteine,N-acetyl-, (2R,3S,4R)-3-hydroxy-2-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-5-oxo-2-pyrrolidinecarboxylate(ester) (9CI); L-Cysteine, N-acetyl-,3-hydroxy-2-(1-hydroxy-2-methylpropyl)-4-methyl-5-oxo-2-pyrrolidinecarboxylate(ester), [2R-[2a,2(S*),3a,4a]]-; (+)-Lactacystin; Lactacystin