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