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