9H,18H-10,12-Ethanediylidene-15,17-ethenobenzo[e]diindeno[1,7-mn:7',1'-kl][1,10,4,7]dioxadiazacyclopentadecine, 1,2,3,4-tetrahydro-1,1,4,4-tetramethyl- AIDS-152052 AIDS152052 NSC694696