Ethyl 3-chloro-2-cyano-5-(difluoromethyl)pyridine-4-carboxylate
3-Chloro-5-(difluoromethyl)-6-nitropyridine-2-sulfonyl chloride
3-Chloro-4-(difluoromethyl)-2-nitropyridine-6-sulfonyl chloride
4-Chloro-3-(difluoromethyl)-2-methylpyridine-6-sulfonyl chloride