1. De Silva, E. D.; Scheuer, P. J. Tetrahedron Lett. 1980, 21, 1611.
2. For reviews, see: (a) Mayer, A. M. S.; Jacobs, R. S. In Biomedical Importance of Marine Organisms; Fautin, D. G., Ed.; California Academy of Sciences: San Francisco, 1988; pp. 133–142;
3. (b) Potts, B. C. M.; Faulkner, D. J.; Jacobs, R. S. J. Nat. Prod. 1992, 55, 1701;
4. (c) Mann, J. Nature 1992, 358, 540;
5. (d) Soriente, A.; De Rosa, M.; Scettri, A.; Sodano, G.; Terencio, M. C.; Paya, M.; Alcaraz, M. J. Curr. Med. Chem. 1999, 6, 415–431.