Three new acylated spermidines and two known related compounds were isolated from the Okinawan soft coral, Sinularia sp. These compounds were N',N",N"-trimethylspermidines that are acylated by a methyl-branched unsaturated fatty acid. These acylspermidines showed potent cytotoxicity against human tumor cell lines at an IC(50) value of 17 ng/ml and the induction of apoptotic phenomena.
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Ojika et al. (2003) studied this question.