(S)-N-<2-
N-<2-Methyl-1-<(triphenylmethyl)amino>-2-propyl>-L-alanine methyl ester
(S)-2-[Benzyl-(3-tert-butoxycarbonylamino-propyl)-amino]-propionic acid methyl ester
methyl (2S)-2-(3-{[(benzyloxy)carbonyl]amino}-2-oxo-1,2-dihydropyridin-1-yl)propanoate
2-(6-Benzyl-3-benzyloxycarbonylamino-2-oxo-2H-pyridin-1-yl)-propionic acid methyl ester