tert-butyl (1R,3S,4S)-3-(5-(10-(2-((S)-1-(tert-butoxycarbonyl)pyrrolidin-2-yl)-1H-imidazol-5-yl)-6-methyl-6H-benzo[5,6][1,3]oxazino[3,4-a]indol-3-yl)-1H-imidazol-2-yl)-2-azabicyclo[2.2.1]heptane-2-carboxylate