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