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