(2S,3EZ)-tert-butyl 6-benzyloxy-2N-(tert-butoxycarbonyl)amino-4-hexenoate

(S)-(-)-tert-butyl-2-<(tert-butoxycarbonyl)amino>-6-iodohexanoate

(2S,4S)-4-(tert-Butoxycarbonylamino-methyl)-5-oxo-pyrrolidine-2-carboxylic acid tert-butyl ester

(2S,4S)-2-Amino-4-(tert-butoxycarbonylamino-methyl)-pentanedioic acid 1-tert-butyl ester 5-methyl ester

(S)-2-Amino-3-[3-bromo-5-(3-trifluoromethyl-3H-diazirin-3-yl)-phenyl]-propionic acid tert-butyl ester