Ethyl 5-(difluoromethyl)-3,4-dihydroxypyridine-2-acetate
Ethyl 3-(difluoromethyl)-4,5-dihydroxypyridine-2-acetate
Methyl 6-(difluoromethyl)-2,3-dihydroxypyridine-5-carboxylate
Methyl 6-(difluoromethyl)-2,3-dihydroxypyridine-4-carboxylate
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