1 K74 N-methyl-2-[(4,5,6,7-tetrabromo-1-methyl-1h-benzimidazol-2-yl)sulfanyl]acetamide 1.000 2 K37 4,5,6,7-tetrabromo-2-(methylsulfanyl)-1h-benzimidazole 0.750 3 K22 4,5,6,7-tetrabromo-1h,3h-benzimidazol-2-thione 0.700