4-Bromo-2-(difluoromethyl)-3-nitropyridine-5-acetic acid
4-Bromo-2-(chloromethyl)-3-(difluoromethyl)-6-nitropyridine
5-Bromo-3-(chloromethyl)-2-(difluoromethyl)-4-nitropyridine
5-Bromo-3-(chloromethyl)-4-(difluoromethyl)-2-nitropyridine
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