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