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The lupane triterpenoid betulonic aldehyde (also known as betulonal) is a product of betulin oxidation. Crystals of two ortho­rhom­bic polymorphs were obtained from hexane and dimethyl sulfoxide solutions. The molecular geometric parameters in the two forms are similar, but the structures are different with respect to the crystal packing. The mol­ecular structures of both polymorphs are stabilized by weak inter­molecular C—H...O and van der Waals inter­actions.
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