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