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