benzyl N-[(2S,3R)-3-(N-benzyloxycarbonyl)amino-2-tert-butyldimethylsiloxy-4-phenyl-butanoyl]-L-leucinate

methyl ((4R,5S)-4-benzyl-2-oxooxazolidine-5-carbonyl)-L-leucinate

(2S)-2-氨基-4-甲基戊酸甲酯

(4R,5S)-4-benzyl-3-[(tert-butoxy)carbonyl]-2,2-dimethyl-1,3-oxazolidine-5-carboxylic acid

[(3R)-tert-butoxycarbonylamino-(2S)-hydroxy-2,3-isopropylidene-4-phenylbutanoyl]-L-leucine methyl ester