Ethyl 4-amino-2-(difluoromethyl)-6-methylpyridine-3-carboxylate
Ethyl 5-amino-2-(bromomethyl)-3-(difluoromethyl)pyridine-6-acetate
Methyl 4-amino-2-(aminomethyl)-6-(difluoromethyl)pyridine-3-acetate
Methyl 3-amino-5-(aminomethyl)-6-(difluoromethyl)pyridine-2-acetate