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Three new sesterterpenes (1-3) were isolated from a marine sponge of the genus Spongia, and their structures were determined on the basis of spectroscopic analysis. The compounds 1-3 exhibited cytotoxicity against HeLa cells with IC(50) values of 19.5, 15.0, and 5.3 microg/mL, respectively.
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Tsukamoto et al. (2003) studied this question.
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