Pyrazino(1'',2'':1,5;4'',5'':1',5')dipyrrolo(2,3-b:2',3'-b')diindole-7,15(5H,7ah)-dione, 5a,8,8a,13,13a,15a,16,16a-octahydro-8a,16a-bis(1,1-dimethyl-2-propenyl)-, (5aS-(5a-alpha,7a-beta,8a-alpha,13a-alpha,15a-beta,16a-alpha))-