Vulgarisin A, a new diterpenoid with a rare 5/6/4/5 ring skeleton from the Chinese medicinal plant Prunella vulgaris.

@article{Lou2014VulgarisinAA,
  title={Vulgarisin A, a new diterpenoid with a rare 5/6/4/5 ring skeleton from the Chinese medicinal plant Prunella vulgaris.},
  author={Hua-yong Lou and Shang-zhen Zheng and Tianlei Li and Jian-xin Zhang and Yue Fei and Xiaojiang Hao and Guang-yi Liang and Wei-dong Pan},
  journal={Organic letters},
  year={2014},
  volume={16 10},
  pages={
          2696-9
        }
}
Vulgarisin A (1), a new diterpenoid with an unprecedented 5/6/4/5 fused tetracyclic ring skeleton, has been isolated from the medicinal plant Prunella vulgaris Linn. Its structure was characterized by extensive spectroscopic methods, and the absolute configuration was secured by single crystal X-ray diffraction analysis. Compound 1 showed weak cytotoxicity against human lung carcinoma A549 cells with an IC50 value of 57.0 μM. 
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