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