7512-02-9 9-(2,6-Dimethyltetrahydro[1,3]dioxino[5,4-d][1,3]dioxin-4-yl)-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione AIDS-130224 AIDS130224 NSC400290