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