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