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