research papers
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—HO and van der Waals interactions.