Three new antiprotozoan compounds, gracilioethers A-C (1-3), have been isolated from the marine sponge Agelas gracilis. Their structures were elucidated on the basis of spectroscopic and chemical methods. Gracilioethers A-C showed antimalarial activity against Plasmodium falciparum with IC(50) values of 0.5-10 microg/mL, whereas gracilioether B (2) also showed antileishmanial activity.
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Ueoka et al. (2009) studied this question.
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