3-Chloro-5-cyano-2-(trifluoromethoxy)pyridine-4-sulfonyl chloride
5-Chloro-4-cyano-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
3-Chloro-4-cyano-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
6-Chloro-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-carboxylic acid