7,13-Etheno-1H,9H-[1,2,4]triazolo[1,2-a][1,2,4]triazolo[1',2':1,2]pyridazino[4,5-c]pyridazine-1,3,9,11(2H,10H)-tetrone, 5,7,13,13a-tetrahydro-2,10-dimethyl- AIDS-151620 AIDS151620 NSC692609