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