2-Bromo-3-cyano-6-(difluoromethyl)-5-nitropyridine
4-Bromo-3-cyano-2-(difluoromethyl)-6-iodopyridine
2-Bromo-3-cyano-5-(difluoromethyl)-4-nitropyridine
3-Bromo-6-cyano-2-(difluoromethyl)-4-iodopyridine
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