(8a-Methoxy-5-methyl-6-(4-methyl-1-piperazinyl)-4,7-dioxo-1,1a,2,4,7,8,8a,8b-octahydroazireno[2',3':3,4]pyrrolo[1,2-a]indol-8-yl)methyl carbamate AIDS-130664 AIDS130664 NSC608750