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