ethyl (2R,3S)-3-{[(R)-1-phenylethyl]amino}-2-hydroxy-3-phenylpropanoate

苯甲酰氯

2-keto-3-(N-benzoyl-amino)-3-phenyl propionic acid ethyl ester

ethyl (2R,3S)-3-azido-2-O-benzoyl-3-phenylpropionate

ethyl (4S,5R)-2,4-diphenyl-4,5-dihydrooxazole-5-carboxylate