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