(2S)-2-{[(tert-butoxy)carbonyl]amino}-8-oxodecanoic acid

(S)-N-[3,5-bis(benzyloxy)phenethyl]-2-(dibenzylamino)-5-hydroxypentanamide

(2S,9R)-2-amino-9-(tert-butyldimethylsilyloxy)-8-oxodecanoic acid

(2S,9R)-2-(tert-butoxycarbonylamino)-9-(tert-butyldimethylsilyloxy)-8-oxo-6-decanoic acid

(-)-(3S,9S,14aR)-9-benzyl-3-[(R)-7-hydroxy-6-oxooctyl]-6,6-dimethyldecahydropyrrolo[1,2-a][1,4,7,10]tetraazacyclododecine-1,4,7,10-tetraone