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(1’R ,5’aS ,7’R ,8’aS ,9’aR)-2′,3′,8’a,9′-tetrahydro-1′-hydroxy-1′,4,4,8′,8′,11′-hexamethyl-spiro[4H,8H-[1,4]dioxepino[2,3-g]indole-8,7′(8’H)-[5H,6H-5a,9a](iminomethano)[1H]cyclopent[f]indolizine]-9,10′(10H)-dione