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