C-O Ring Construction: Burseran (Tanaka), Hyperione A (Dai), Spirotenuipesine A (Imagawa), Stachyodin A (Ito), Alstilobanine C Zhu), Biselide A (Britton)
The sap from the elephant tree of northern Mexico, Bursera microphylla, was used locally as a cure-all for diseases, particularly those affecting the skin. Hiroshi Tanaka of the Tokyo University…