2-((4-((1,3-Dioxo-1,5,10,10a-tetrahydroimidazo[1,5-b]isoquinolin-2(3H)-yl)methyl)-1-piperazinyl)methyl)-10,10a-dihydroimidazo[1,5-b]isoquinoline-1,3(2H,5H)-dione AIDS-138547 AIDS138547 NSC645587