tert-butyl (1S,2S,4R)-5-({(1S)-1-[(benzylamino)carbonyl]-2-methylpropyl}amino)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-isobutyl-4-methyl-5-oxopentylcarbamate

((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 allyl ester

(2R,4S,5S)-5-Amino-4-(tert-butyl-dimethyl-silanyloxy)-2,7-dimethyl-octanoic acid ((S)-1-benzylcarbamoyl-2-methyl-propyl)-amide

{(R)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-2-methylsulfanyl-ethyl}-carbamic acid tert-butyl ester

(E)-(4S,7S)-4-Isopropyl-2,5,9-trioxo-1-oxa-3,6,10-triaza-cyclohexadec-12-ene-7-carboxylic acid [(1S,2S,4R)-4-((S)-1-benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-isobutyl-pentyl]-amide

tert-butyl (1S,2S,4R)-5-({(1S)-1-[(benzylamino)carbonyl]-2-methylpropyl}amino)-2-hydroxy-1-isobutyl-4-methyl-5-oxopentylcarbamate

{(S)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propyl}-carbamic acid tert-butyl ester

((S)-1-{(S)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propylcarbamoyl}-2-methyl-propyl)-carbamic acid tert-butyl 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 but-3-enyl ester

((S)-1-{(R)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-2-methylsulfanyl-ethylcarbamoyl}-2-methyl-propyl)-carbamic acid tert-butyl ester

(E)-(4S,7S)-4-Isopropyl-2,5,9-trioxo-1-oxa-3,6,10-triaza-cyclopentadec-12-ene-7-carboxylic acid [(1S,2S,4R)-4-((S)-1-benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-isobutyl-pentyl]-amide

(E)-(4S,7S)-4-Isopropyl-2,5,9-trioxo-1-oxa-3,6,10-triaza-cyclotetradec-12-ene-7-carboxylic acid [(1S,2S,4R)-4-((S)-1-benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-isobutyl-pentyl]-amide

((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