[(R)-1-((S)-1-{(S)-1-[((1S,2R)-1-Benzyl-2-hydroxy-pent-4-enyl)-methyl-carbamoyl]-2-methyl-propylcarbamoyl}-ethyl)-octyl]-carbamic acid benzyl ester

[(R)-1-((S)-1-Methyl-2-oxo-ethyl)-octyl]-carbamic acid benzyl ester

[(R)-1-((R)-1-Methyl-allyl)-octyl]-carbamic acid benzyl ester

{(R)-1-[(S)-1-((S)-1-{[(1S,2R)-1-Benzyl-2-(tert-butyl-dimethyl-silanyloxy)-4-oxo-butyl]-methyl-carbamoyl}-2-methyl-propylcarbamoyl)-ethyl]-octyl}-carbamic acid benzyl ester