2,2'-Ethylidenebis[5-(2-imidazolin-2-yl)-1H-benzimidazole] 5-(4,5-Dihydro-1H-imidazol-2-yl)-2-{1-[6-(4,5-dihydro-1H-imidazol-2-yl)-1H-benzimidazol-2-yl]ethyl}-1H-benzimidazole AIDS-195631 AIDS195631