2-Cyano-6-hydroxy-4-(trifluoromethoxy)pyridine-3-sulfonyl chloride
2-Chloro-6-methyl-3-(trifluoromethoxy)pyridine-4-sulfonyl chloride
6-Chloro-3-methyl-4-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2-Cyano-5-hydroxy-6-(trifluoromethoxy)pyridine-3-sulfonyl chloride