Acetic acid (2R,3R)-3-phenyl-1-((R)-1-phenyl-ethyl)-aziridin-2-ylmethyl ester

tert-butyl (R)-4-benzyl-5-oxooxazolidine-3-carboxylate

Boc-L-丝氨酸甲酯

(S)-methyl 2-((tert-butoxycarbonyl)amino)-3-((tert-butyldimethylsilyl)oxy)propanoate