Sesquiterpene lactones and inositol esters from Arnica angustifolia.

  title={Sesquiterpene lactones and inositol esters from Arnica angustifolia.},
  author={T. Schmidt and G. Willuhn and A. Steigel and D. Wendisch},
  journal={Planta medica},
  volume={61 6},
From flowerheads of Arnica angustifolia ssp. attenuata nine helenanolides, two 1,5- trans-guaianolides, and a mixture of inositol-tetraesters were isolated. Five of the helenanolides are described for the first time. One of them, 4- O-tigloylarnicalpin, is the first 7(12),6-trans-lactonized pseudoguaianolide isolated from a natural source. The occurrence of inositol esters within the genus Arnica has not been reported before. 
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