2-Hydroxy-5-methoxy-3-nitro-4-(trifluoromethoxy)pyridine
4-(Chloromethyl)-5-hydroxy-2-nitro-3-(trifluoromethoxy)pyridine
5-(Bromomethyl)-3-hydroxy-4-methoxy-2-(trifluoromethoxy)pyridine
3-(Bromomethyl)-5-hydroxy-2-methoxy-4-(trifluoromethoxy)pyridine