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