Globulixanthones A and B, two new cytotoxic xanthones with isoprenoid groups from the root bark of Symphonia globulifera.

@article{Nkengfack2002GlobulixanthonesAA,
  title={Globulixanthones A and B, two new cytotoxic xanthones with isoprenoid groups from the root bark of Symphonia globulifera.},
  author={Augustin Ephrem Nkengfack and Pierre Mkounga and Zacharias Tanee Fomum and Mich{\`e}le Meyer and Bernard Bodo},
  journal={Journal of natural products},
  year={2002},
  volume={65 5},
  pages={
          734-6
        }
}
Bioassay-guided fractionation of a root bark extract of Symphonia globulifera has yielded, in addition to stigmasterol, two new xanthones with isoprenoid units, named globulixanthones A (1) and B (2). The structures of these compounds have been elucidated by spectroscopic means. They possess significant cytotoxicity in vitro against the KB cell line. 
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