VM 29919 paraherquamide (-)-Paraherquamide A 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, 2',3',8'a,9'-tetrahydro-1'-hydroxy-1',4,4,8',8',11'-hexamethyl-, (1'R,5'aS,7'R,8'aS,9'aR)-