4-Cyano-5-hydroxy-2-(trifluoromethoxy)pyridine-3-carbonyl chloride
5-Cyano-3-fluoro-4-(trifluoromethoxy)pyridine-2-carbonyl chloride
4-Cyano-5-hydroxy-3-(trifluoromethoxy)pyridine-2-carbonyl chloride
4-Cyano-3-hydroxy-2-(trifluoromethoxy)pyridine-6-carbonyl chloride