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
3-Cyano-5-(difluoromethyl)-2-methyl-6-nitropyridine
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