5-Chloro-6-((5-chloro-2-(trifluoromethyl)-1H-benzimidazol-6-yl)dithio)-2-(trifluoromethyl)-1H-benzimidazole AIDS-143237 AIDS143237 Bis(5-chloro-2-(trifluoromethyl)-1H-benzimidazol-6-yl) disulfide NSC663641