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