2-(Difluoromethyl)-4-fluoro-5-nitro-3-(trifluoromethoxy)pyridine
4-Fluoro-5-(fluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine
3-Fluoro-4-(fluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine
3-Fluoro-2-(fluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine