4-Cyano-5-(difluoromethyl)-2,3-dihydroxypyridine
4-Chloro-2-(difluoromethyl)-3,5-dihydroxypyridine
2-Chloro-6-(difluoromethyl)-3,5-dihydroxypyridine
2-Chloro-4-(difluoromethyl)-3,5-dihydroxypyridine
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