(S)-2-{[(S)-2-((S)-4-Cyano-2-hydroxy-butyrylamino)-octanoyl]-methyl-amino}-4-methyl-pentanoic acid tert-butyl ester

tert-butyl N-((S)-2-((R)-2-((N-((2S,4R)-2-((S)-2-((S)-2-((tert-butoxycarbonyl)amino)-N,4-dimethylpentanamido)-3-(1-methoxy-1H-indol-3-yl)propanamido)-4-methyloctanoyl)-N-methyl-L-alanyl)oxy)-4-cyanobutanamido)octanoyl)-N-methyl-L-leucinate