The leaves of rose-bay willow-herb (Chamaenerion angustifolium) are shown to contain ursolic acid, oleanolic acid, maslinic acid, and a hitherto unknown acid, 2α-hydroxyursolic acid. A partial synthesis of the new acid is described and some of its derivatives are compared with the corresponding derivatives of the isomeric maslinic acid.
A. T. Glen, W. Lawrie, J. McLean and M. E. Younes, J. Chem. Soc. C, 1967, 510 DOI: 10.1039/J39670000510
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