6-(2-Chlorophenyl)-3-(8-(6-(2-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-153515 AIDS153515 NSC700445