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