3-Cyano-5-(difluoromethyl)-6-hydroxy-2-(trifluoromethoxy)pyridine
2-Cyano-5-(difluoromethyl)-3-hydroxy-6-(trifluoromethoxy)pyridine
2-Chloro-6-(fluoromethyl)-3-hydroxy-4-(trifluoromethoxy)pyridine
6-Chloro-3-(fluoromethyl)-4-hydroxy-2-(trifluoromethoxy)pyridine