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