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