Pyranoxanthones from Mesua ferrea

@article{Teh2011PyranoxanthonesFM,
  title={Pyranoxanthones from Mesua ferrea},
  author={S. Teh and G. Ee and M. Rahmani and Y. H. Taufiq-Yap and R. Go and S. Mah},
  journal={Molecules},
  year={2011},
  volume={16},
  pages={5647 - 5654}
}
Our phyto chemical studies on the root bark extracts of Mesua ferrea have led to the isolation of two new pyranoxanthones, mesuaferrin A (1) and mesuaferrin B (2). Five other compounds – caloxanthone C (3), 1,8-dihydro-3-methoxy-6-methylanthraquinone (4), β-sitosterol (5), friedelin (6) and betulinic acid (7) – were also successfully isolated. Structural elucidations of these compounds were achieved using 1D and 2D NMR and MS techniques. 
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