Structural determination of three new eudesmanolides from Inula helenium.

@article{Ma2008StructuralDO,
  title={Structural determination of three new eudesmanolides from Inula helenium.},
  author={Xiao Chi Ma and Kexin Liu and Bao-jing Zhang and Xiu-lan Xin and Jian Huang},
  journal={Magnetic resonance in chemistry : MRC},
  year={2008},
  volume={46 11},
  pages={1084-8}
}
Ten sesquiterpenens were isolated from Inula helenium. Among them, three eudesmanolides: 15-hydroxy-11betaH-eudesm-4-en-8beta,12-olide (1), 3alpha-hydroxy-11betaH-eudesm-5-en-8beta,12-olide (2) and 2beta, 11alpha-dihydroxy-eudesm-5-en-8beta,12-olide (3) are new compounds. Their chemical structures were determined by spectral methods including 2D NMR.