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