Ethyl 3-amino-4-(bromomethyl)-2-(difluoromethyl)pyridine-5-carboxylate
4-Amino-3-(bromomethyl)-2-(difluoromethyl)pyridine-6-acetic acid
Methyl 4-amino-6-(chloromethyl)-3-(difluoromethyl)pyridine-2-acetate
4-Amino-2-(bromomethyl)-6-(difluoromethyl)pyridine-3-acetic acid