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