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