2-Bromo-5-(difluoromethyl)-3-nitropyridine-6-sulfonamide
5-Bromo-2-(chloromethyl)-3-(difluoromethyl)pyridine-6-acetonitrile
4-(Aminomethyl)-5-bromo-2-(difluoromethyl)pyridine-3-acetonitrile
2-Bromo-4-(chloromethyl)-6-(difluoromethyl)pyridine-3-acetonitrile