(4R,7R)-N-[(2R,5S,10aS,10bS)-5-[(2S)-but-2-yl]-10b-hydroxy-3,6-dioxo-2-(prop-2-yl)-3,5,6,8,9,10,10a,10b-octahydro-2H-[1,3]oxazolo[3,2-a]pyrrolo[2,1-c]pyrazin-2-yl]-10-bromo-6-methyl-6,11-diazatetracyclo[7.6.1.012,16.02,7]hexadeca-1(15),2(3),9(10),12(16),13-pentaene-4-carboxamide