4-(Difluoromethyl)-2,3-dihydroxypyridine-5-acetonitrile
4-(Chloromethyl)-2-(difluoromethyl)-3,5-dihydroxypyridine
2-(Chloromethyl)-6-(difluoromethyl)-3,5-dihydroxypyridine
2-(Chloromethyl)-4-(difluoromethyl)-3,5-dihydroxypyridine
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