S. G. Il'in, G. V. Malinovskaya, M. Antipin
Sep 1, 1991
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Journal
Chemistry of Natural Compounds
Abstract
The complete spatial structure of 20S,24S-dihydroxydammar-25-en-3-one — a triterpenoid isolated from the leaves of a Far-Eastern species of birch,Betula mandschurica — has been established. Intermolecular cooperative hydrogen bonds that are unusual for a triterpenoid system have been detected in crystals of 20S,24S-dihydroxydammar-25-en-3-one, with the participation of both hydroxy groups in one chain of bonds and an orientation of the associated molecules that is characteristic for a bimolecular layer.