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