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