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