3-Cyano-5-(difluoromethyl)-6-fluoropyridine-2-sulfonyl chloride
4-Cyano-3-(difluoromethyl)-2-iodopyridine-6-sulfonyl chloride
3-Cyano-4-(difluoromethyl)-6-fluoropyridine-2-sulfonyl chloride
3-(Chloromethyl)-2-cyano-6-(difluoromethyl)-4-methylpyridine