(R)-3-(3-Bromophenyl)-2-((tert-butoxycarbonyl)amino)propanoic acid
(S)-2-[(tert-Butoxycarbonyl)amino]-3-iodopropionic acid methyl ester
(2S)-4-(Benzyloxy)-2-[(tert-butoxycarbonyl)amino]-4-oxobutanoic acid
N-(9-Fluorenylmethoxycarbonyl)glutamic acid α-tert-butyl ester