3-Bromo-5-fluoro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
5-Bromo-2-hydroxy-3-(trifluoromethoxy)pyridine-4-sulfonyl chloride
5-Bromo-4-fluoro-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
4-Bromo-3-hydroxy-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride