Ethyl 3-(bromomethyl)-2-cyano-5-(difluoromethyl)pyridine-6-carboxylate
Methyl 3-cyano-5-(difluoromethyl)-6-nitropyridine-2-carboxylate
Ethyl 6-(bromomethyl)-3-cyano-4-(difluoromethyl)pyridine-2-carboxylate
Methyl 2-cyano-6-(difluoromethyl)-3-nitropyridine-5-carboxylate