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