6-(4-Chlorophenyl)-3-(8-(6-(4-chlorophenyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-3-yl)octyl)[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole AIDS-153516 AIDS153516 NSC700446