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