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The leaves of rose-bay willow-herb (Chamaenerion angustifolium) are shown to contain ursolic acid, oleanolic acid, maslinic acid, and a hitherto unknown acid, 2a-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.* The compound described by Aplin and co-workers as 2-hydroxyursolic acid (see ref. 6b) was later shown to be maslinic acid.
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