2-Cyano-3-(fluoromethyl)-6-hydroxy-5-(trifluoromethoxy)pyridine
4-(Chloromethyl)-3-cyano-5-hydroxy-2-(trifluoromethoxy)pyridine
5-(Chloromethyl)-4-cyano-2-hydroxy-3-(trifluoromethoxy)pyridine
3-(Chloromethyl)-2-cyano-6-hydroxy-5-(trifluoromethoxy)pyridine