(R)-methyl 2-(2-(2-((S)-1-(tert-butoxycarbonylamino)but-3-en-1-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazol-4-yl)-5-(methoxycarbonylamino)phenylamino)pent-4-enoate

methyl (9R,14S)-17-bromo-14-{[(tert-butoxy)carbonyl]amino}-5-[(methoxycarbonyl)amino]-8-(trifluoroacetyl)-16-{[2-(trimethylsilyl)ethoxy]methyl}-8,16,18-triazatricyclo[13.2.1.02,7]octadeca-1(17),2,4,6,15(18)-pentaene-9-carboxylate