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