Abstract
Abstract Structures of two polymorphic crystals 1a and 1b of 4′-dimethylamino-3-hydroxyflavone (1) have been determined. Each crystal has intermolecular hydrogen-bonded dimers with the adjacent molecule. The dimeric structure in crystal 1a is nearly planar, whereas that in crystal 1b is slightly bent with respect to the chromane moieties. In both crystals there is a stacking structure of the dimers linked by π–π interactions.
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