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