Constituents of the root bark of Severinia buxifolia collected in Hainan.

@article{Wu2001ConstituentsOT,
  title={Constituents of the root bark of Severinia buxifolia collected in Hainan.},
  author={T. S. Wu and Chong Meng Chen and Ful Wen Lin},
  journal={Journal of natural products},
  year={2001},
  volume={64 8},
  pages={
          1040-3
        }
}
Two new tetranortriterpenoids, 7-isovaleroylcycloseverinolide (1) and 7-isovaleroylcycloepiatalantin (2), together with 28 known compounds, were isolated and characterized from the root bark of Severinia buxifolia collected in Hainan. The structures of 1 and 2 were elucidated on the basis of spectral evidence including 2D NMR and X-ray techniques. The cytotoxicity of several acridone alkaloid isolates (3-8) was evaluated against a small tumor cell panel. 
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