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