benzyl (S)-2-[(tert-butoxycarbonyl)amino]pent-4-ynoate

4,4'-{4-[(S)-4-benzyloxycarbonyl-4-(tert-butoxycarbonyl)aminobutyl]pyridin-3,5-diyl}di[(S)-2-(tert-butoxycarbonyl)aminobutanoic acid]

3,5-bis{[(S)-2,2-dimethyl-3-tert-buthoxycarbonyl-1,3-oxazolidin-4-yl]ethynyl}-4-iodopyridine

4-bromo-3,5-diiodopyridine