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