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