methyl (1aS,3R,11S,13S,13aR)-11-((3aR,3a1R,4R,5S,5aR,10bR)-4-acetoxy-3a-ethyl-5-hydroxy-8-methoxy-5-(methoxycarbonyl)-6-nitroso-3a,3a1,4,5,5a,6,11,12-octahydro-1H-indolizino[8,1-cd]carbazol-9-yl)-1a-ethyl-1a,4,5,10,11,12,13,13a-octahydro-2H-3,13-methanooxireno[2',3':9,10][1]azacycloundecino[5,4-b]indole-11-carboxylate
