6-Chloro-3-hydroxy-4-(trifluoromethoxy)pyridine-2-carboxylic acid
4-Cyano-6-(difluoromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine
5-Cyano-2-hydroxy-3-(trifluoromethoxy)pyridine-4-acetic acid
4-Cyano-5-hydroxy-3-(trifluoromethoxy)pyridine-2-acetic acid