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