2-Amino-4-(difluoromethyl)-3,6-dihydroxypyridine
4-Amino-2-(difluoromethyl)-3,6-dihydroxypyridine
4-Amino-3-(difluoromethyl)-2,5-dihydroxypyridine
3-Amino-6-(difluoromethyl)-2,5-dihydroxypyridine
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