5-Cyano-3-hydroxy-2-(trifluoromethoxy)pyridine-4-carboxylic acid
3-Cyano-5-hydroxy-4-(trifluoromethoxy)pyridine-2-carboxylic acid
3-Chloro-6-cyano-4-(trifluoromethoxy)pyridine-2-acetonitrile
5-Cyano-4-hydroxy-2-(trifluoromethoxy)pyridine-3-carboxylic acid