(11S,11aS)-4-((S)-2-((S)-2-(((allyloxy)carbonyl)amino)-3-methylbutanamido)propanamido)benzyl 11-((tert-butyldimethylsilyl)oxy)-2-(4-fluorophenyl)-8-hydroxy-7-methoxy-5-oxo-11,11a-dihydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepine-10(5H)-carboxylate