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