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