6-(Bromomethyl)-2-cyano-3-nitro-4-(trifluoromethoxy)pyridine
3-(Chloromethyl)-4-fluoro-5-(trifluoromethoxy)pyridine-2-acetonitrile
2-(Bromomethyl)-6-cyano-4-nitro-3-(trifluoromethoxy)pyridine
3-(Chloromethyl)-2-fluoro-6-(trifluoromethoxy)pyridine-5-acetonitrile