5-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Cyano-4-(fluoromethyl)-2-iodo-5-(trifluoromethoxy)pyridine
4-Cyano-3-hydroxy-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride
4-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride