[(1S,3S,5Z,7R,8E,11S,12S,13E,15S,17R,21R,23R)-25-acetyloxy-1,11,21-trihydroxy-17-[(1R)-1-hydroxyethyl]-5,13-bis(2-methoxy-2-oxoethylidene)-10,10,26,26-tetramethyl-19-oxo-18,27,28,29-tetraoxatetracyclo[21.3.1.13,7.111,15]nonacos-8-en-12-yl] (2E,4E)-octa-2,4-dienoate
A group of 20-member macrolactones in which there are three remotely substituted pyran rings that are linked by a methylene bridge and an E-disubstituted alkene and have geminal dimethyls at C8 and C18 carbons. Some interact with PROTEIN KINASE C.