4-(Difluoromethyl)-2-fluoro-6-nitro-3-(trifluoromethoxy)pyridine
4-(Chloromethyl)-6-fluoro-3-nitro-2-(trifluoromethoxy)pyridine
4-(Difluoromethyl)-2-fluoro-3-nitro-6-(trifluoromethoxy)pyridine
4-(Chloromethyl)-2-fluoro-3-nitro-5-(trifluoromethoxy)pyridine