3-Chloro-5-cyano-2-(trifluoromethoxy)pyridine-6-carboxylic acid
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