133343-34-7 L-Cysteine, N-acetyl-, (2R,3S,4R)-3-hydroxy-2-(1-hydroxy-2-methylpropyl)-4-methyl-5-oxo-2-pyrrolidinecarboxylate (ester) L-Cysteine, N-acetyl-, 3-hydroxy-2-(1-hydroxy-2-methylpropyl)-4-methyl-5-oxo-2-pyrrolidinecarboxylate (ester), (2R-(2alpha,2(S*),3alpha,4alpha))- Lactacystin