2-Bromo-6-(difluoromethyl)-3-nitropyridine-4-carboxaldehyde
2-Bromo-4-(chloromethyl)-3-(difluoromethyl)pyridine-6-carboxaldehyde
6-Bromo-3-(difluoromethyl)-2-nitropyridine-4-carboxaldehyde
2-Bromo-3-(chloromethyl)-6-(difluoromethyl)pyridine-5-carboxaldehyde