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