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