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