2-Amino-4-(bromomethyl)-6-(difluoromethyl)pyridine-3-acetonitrile
2-Amino-4-(bromomethyl)-3-(difluoromethyl)pyridine-6-acetonitrile
2-Amino-3-(bromomethyl)-6-(difluoromethyl)pyridine-4-acetonitrile
2-Amino-4-(chloromethyl)-3-(difluoromethyl)pyridine-5-acetic acid