The cytotoxic effects of the prenylated products and their substrates were tested with human leukemia K562 and ovarian cancer A2780 sens and A2780 CisR cell lines. Preliminary results have been clearly shown that prenylation at C2 led to a significant increase of the cytotoxicity of the tested cyclic dipeptides in all the 14 cases. The second amino acid and the stereochemistry of tryptophan moiety of the cyclic dipeptides showed less influence on the cytotoxicity of the tested compounds.
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