4-(Difluoromethyl)-2,3-dihydroxy-5-fluoropyridine
4-Cyano-2-(difluoromethyl)-3,5-dihydroxypyridine
2-Cyano-6-(difluoromethyl)-3,5-dihydroxypyridine
2-Cyano-4-(difluoromethyl)-3,5-dihydroxypyridine
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