Benzyl (2S,4R,1'S)-2-(tert-butyl)-4--5-oxo-3-oxazolidinecarboxylate

(2R,3S)-2-acetylamino-3-hydroxy-3-(4-nitro-phenyl)-propionic acid

(2RS,3SR)-2-amino-3-hydroxy-3-phenyl-propionic acid ethyl ester