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