Ethyl 3-amino-4-(aminomethyl)-5-(difluoromethyl)pyridine-2-acetate
Ethyl 3-amino-2-(aminomethyl)-5-(difluoromethyl)pyridine-4-acetate
Ethyl 6-amino-2-(aminomethyl)-3-(difluoromethyl)pyridine-4-acetate
2-Amino-4-(bromomethyl)-5-(difluoromethyl)pyridine-3-acetonitrile