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