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