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