A black Spongia sp. In the Porifera class Demospongiae had been found to contain two new and exceptionally potent cell (human cancer) growth inhibitors named spongistatins 2 (1b) and 3 (1c)
G. R. Pettit, Z. A. Cichacz, F. Gao, C. L. Herald and M. R. Boyd, J. Chem. Soc., Chem. Commun., 1993, 1166 DOI: 10.1039/C39930001166
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