Marine Natural Products. XXXI. Structure-Activity Correlation of a Potent Cytotoxic Dimeric Macrolide Swinholide A, from the Okinawan Marine Sponge Theonella swinhoei, and Its Isomers.

Abstract
Acidic treatment of swinholide A (1), which was characterized as the major cytotoxic macrolide from the Okinawan marine sponge Theonella swinhoei, provided several isomeric macrolides having different size of the dilactone ring structure. From the structure-activity correlation viewpoint, the in vitro cytotoxicities and in vivo antitumor activities of these dimeric macrolides, together with two monomeric macrolides which were synthesized from 1, have been examined.

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