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