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