((S)-1-{(S)-2-Allylcarbamoyl-1-[(1S,2S,4R)-4-((S)-1-benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-isobutyl-pentylcarbamoyl]-ethylcarbamoyl}-2-methyl-propyl)-carbamic acid but-3-enyl ester

((S)-1-{(S)-2-Allylcarbamoyl-1-[(1S,2S,4R)-4-((S)-1-benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-isobutyl-pentylcarbamoyl]-ethylcarbamoyl}-2-methyl-propyl)-carbamic acid pent-4-enyl ester