This is the starting material, which contains a hydroxyl group at the C3 position.
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3-(1,3-diphenylprop-2-ynyl)-6-ethoxy-4-hydroxy-2H-chromen-2-one
4-(4-bromophenyl)-5-(4-hydroxy-2-oxo-2H-chromen-3-yl)-2,3-dihydro-1H-imidazol-2-one
2-amino-4,5-dihydro-4-(2-methylphenyl)-5-oxopyrano[3,2-c]chromene-3-carbonitrile
3'-hydroxywarfarin
