4-Cyano-3-(difluoromethyl)-6-nitropyridine-2-sulfonyl chloride
3-Cyano-4-(difluoromethyl)-2-nitropyridine-6-sulfonyl chloride
2-Cyano-6-(difluoromethyl)-5-methoxypyridine-3-sulfonyl chloride
2-Cyano-3-(difluoromethyl)-6-nitropyridine-4-sulfonyl chloride