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