(4S,5S)-1-benzyloxycarbonyl-5-benzyl-4-hydroxy-2-oxopyrrolidine

benzyl (S,E)-4-benzyl-5-(2-ethoxy-2-oxoethylidene)oxazolidine-3-carboxylate

N-Boc-L-苯丙氨醇

L-threo-Pentitol, 2-amino-1,2,4-trideoxy-1-phenyl-

BOC-L-苯丙氨酸