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