4-(Difluoromethyl)-3-nitro-2-(trifluoromethyl)pyridine-6-carboxaldehyde
4-(Difluoromethyl)-6-nitro-2-(trifluoromethyl)pyridine-3-carboxaldehyde
4-(Difluoromethyl)-6-nitro-3-(trifluoromethyl)pyridine-2-carboxaldehyde
4-(Difluoromethyl)-2-nitro-3-(trifluoromethyl)pyridine-6-carboxaldehyde