(S)-3-t-butoxycarbonyl-4<(S)-1-hydroxyethyl>-2,2-dimethyl-1,3-oxazolidine

((1S,2R)-2-tert-Butoxycarbonylamino-3-hydroxy-1-methyl-propyl)-carbamic acid benzyl ester

(2R,3S)-3-Benzyloxycarbonylamino-2-tert-butoxycarbonylamino-butyric acid

(S)-3-t-butoxycarbonyl-2,2-dimethyl-4-<(R)-1-hydroxyethyl>-1,3-oxazolidine

(S)-4-<(S)-1-azidoethyl>-3-t-butoxycarbonyl-2,2-dimethyl-1,3-oxazolidine