4-Chloro-2-fluoro-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
5-Chloro-3-fluoro-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride
6-Chloro-4-cyano-3-methyl-2-(trifluoromethoxy)pyridine
3-Chloro-5-fluoro-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride