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