s-[5-hydroxy-6-({3-[(6-hydroxy-5-methoxy-1h-indol-2-yl)carbonyl]-5-oxo-1,1a,2,3,5,6-hexahydrocyclopenta[e]cyclopropa[c]indol-7-yl}carbonyl)-4-methoxy-3,6,7,8-tetrahydropyrrolo[3,2-e]indol-2-yl] ethanethioate