184025-39-6

Spiro[5H,6H-5a,9a-(iminomethano)-1H-cyclopent[ f]indolizine-7(8H),3'(2'H)-pyrano[2,3-g]- indole]-2',5,10-trione,1',2,3,7',8a,9- hexahydro-6-hydroxy-7',7',8,8-tetramethyl-,(3'R,5aR,6S,8aS,9aS)-