Synonyms: SwinholideA, 29-O-demethyl-; Swinholide C;10,32,45,46-Tetraoxatricyclo[39.3.1.119,23]hexatetraconta-5,7,21,27,29,43-hexaene-9,31-dione,3,13,15,25,35,37-hexahydroxy-11-[(1S,2S,3S)-2-hydroxy-1,3-dimethyl-5-[(2S,4R,6S)-tetrahydro-4-hydroxy-6-methyl-2H-pyran-2-yl]pentyl]-33-[(1S,2S,3S)-2-hydroxy-1,3-dimethyl-5-[(2S,4R,6S)-tetrahydro-4-methoxy-6-methyl-2H-pyran-2-yl]pentyl]-17,39-dimethoxy-6,12,16,28,34,38-hexamethyl-,(1R,3S,5E,7E,11S,12S,13R,15S,16S,17S,19S,23R,25S,27E,29E,33S,34S,35R,37S,38S,39S,41S)-