Marine natural products. XXII. The absolute stereostructure of swinholide A, a potent cytotoxic dimeric macrolide from the Okinawa marine sponge Theonella swinhoei.
Marine natural products. XXII. The absolute stereostructure of swinholide A, a potent cytotoxic dimeric macrolide from the Okinawa marine sponge Theonella swinhoei.
A potent cytotoxic dimeric macrolide, swinholide A (1), was isolated from the Okinawan marine sponge Theonella swinhoei. The absolute stereostructure of 1, having a dimeric dilactone structure with a 44-membered ring, has been determined on the basis of its chemical behavior and an X-ray crystallographic analysis.