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