(S)-N-(2,2-Dimethyl-1-oxopropyl)-L-cystein ethyl ester, 2-(acetylamino)propanoate (ester) 144965-09-3 L-Cystein, N-(2,2-dimethyl-1-oxopropyl)-, ethyl ester, 2-(acetylamino)propanoate (ester), (S)- Pivaloyl-S-(N'-acetylalanyl)-cysteine ethyl ester Spm 5267 Spm-5267