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