Marine natural products. XXIII. Three new cytotoxic dimeric macrolides, swinholides B and C and isoswinholide A, congeners of swinholide A, from the Okinawan marine sponge Theonella swinhoei.
Following the characterization of swinholide A (1), the major cytotoxic dimeric macrolide, three new congeneric dimeric macrolides, named swinholide B...