Ethyl 3-cyano-4-(difluoromethyl)-6-nitropyridine-2-carboxylate
4-(Bromomethyl)-6-cyano-2-(difluoromethyl)pyridine-3-carboxylic acid
Methyl 2-cyano-4-(difluoromethyl)-6-nitropyridine-3-acetate
4-(Bromomethyl)-2-cyano-5-(difluoromethyl)pyridine-3-carboxylic acid