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