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