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