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