Synonyms: Butanoicacid, 2-amino-4-[[(1,1-dimethylethoxy)carbonyl]amino]-, methyl ester,monohydrochloride, (2S)- (9CI); Butanoic acid,2-amino-4-[[(1,1-dimethylethoxy)carbonyl]amino]-, methyl ester,monohydrochloride, (S)-; Butyric acid, 2-amino-4-(carboxyamino)-, 4-tert-butyl1-methyl ester, hydrochloride (7CI); Butyric acid, 2-amino-4-(carboxyamino)-,4-tert-butyl methyl ester, monohydrochloride, L- (8CI);(2S)-2-Amino-4-[(tert-butoxycarbonyl)amino]butanoic acid methyl esterhydrochloride; Methyl (2S)-2-amino-4-[(tert-butoxycarbonyl)amino]butanoatehydrochloride