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