New ketosteroids from the red alga Hypnea musciformis.

@article{BultelPonc2002NewKF,
  title={New ketosteroids from the red alga Hypnea musciformis.},
  author={V. Bultel-Ponc{\'e} and S. Etahiri and M. Guyot},
  journal={Bioorganic \& medicinal chemistry letters},
  year={2002},
  volume={12 13},
  pages={
          1715-8
        }
}
The dichloromethane/methanol extract from the red alga Hypnea musciformis exhibited PPE elastase inhibition. A diketosteroid, the 20-hydroxy-5alpha-cholest-22-ene-3,6-dione was responsible for this activity. Two new steroids were isolated, 2 was assigned as the 6alpha-hydroxy-cholest-4-ene-3-one and 3 as the 6alpha-hydroxy-cholest-4,22-diene-3-one. The structures were assigned mainly on the basis of 1H and 13C NMR experiments. 
Antigenotoxic ketosteroid from the red algae Jania adhaerens
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