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(1′R ,5′aS ,7’R ,8′aS,9′aR)-2′,3′,8′a,9,9′,10-Hexahydro-1′-hydroxy-1′,4,4,8′,8′,11′-hexamethylspiro[4H,8H-[1,4]dioxepino[2,3-g]indole-8,7′(8′H)-[5H,6H-5a,9a](iminomethano)[1H]cyclopent[f]indolizin]-10′-one