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