6-(Difluoromethyl)-2,3-dihydroxy-5-nitropyridine
6-(Difluoromethyl)-2,3-dihydroxy-4-nitropyridine
5-(Difluoromethyl)-2,3-dihydroxy-6-nitropyridine
5-(Difluoromethyl)-2,3-dihydroxy-4-nitropyridine
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