N-[(2S,3S)-3-azido-2-hydroxy-4-phenylbutanoyl]-L-leucine benzyl ester

benzyl ((4R,5S)-4-benzyl-2-phenyl-4,5-dihydrooxazole-5-carbonyl)-L-leucinate

N-Boc bestatin

benzyl N-[(2S,3R)-3-(N-benzyloxycarbonyl)amino-2-hydroxy-4-phenylbutanoyl]-L-leucinate

methyl N-{(2S,3R)-2-O-benzyl-4-phenyl-3-[9-phenyl-9-fluorenyl-amino]-butanoyl}-L-leucine