Methyl 2-(difluoromethyl)-4-hydroxypyridine-5-carboxylate
Methyl 2-(difluoromethyl)-4-hydroxypyridine-3-carboxylate
Methyl 2-(difluoromethyl)-3-hydroxypyridine-6-carboxylate
3-(Difluoromethyl)-6-hydroxypyridine-2-carboxylic acid
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