4-Amino-2-(difluoromethyl)-3-hydroxy-6-nitropyridine
4-Amino-2-(difluoromethyl)-3-hydroxy-5-nitropyridine
5-Amino-3-(difluoromethyl)-2-hydroxy-4-nitropyridine
3-Amino-5-(difluoromethyl)-6-hydroxy-2-nitropyridine
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