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