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