2-Bromo-3-nitro-4-(trifluoromethoxy)pyridine-5-sulfonamide
4-Bromo-3-nitro-2-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Bromo-2-nitro-6-(trifluoromethoxy)pyridine-4-sulfonyl chloride
3-Bromo-5-nitro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride