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