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