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