4-Bromo-5-cyano-3-(difluoromethyl)pyridine-2-sulfonyl chloride
4-Bromo-3-cyano-2-(difluoromethyl)pyridine-6-sulfonyl chloride
4-Bromo-6-cyano-2-(difluoromethyl)pyridine-3-sulfonyl chloride
3-Bromo-4-(chloromethyl)-6-(difluoromethyl)-2-iodopyridine
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