(4Z)-8-hydroxy-4-[(2E)-4-hydroxy-4-methylpent-2-en-1-ylidene]-7,11-bis(methylene)decahydrocyclonona[c]pyran-3(1H)-one 8-Hydroxy-4-(4-hydroxy-4-methyl-pent-2-enylidene)-11-methylene-decahydro-cyclonona[c]pyran-3,7-dione InChI=1/C20H28O4/c1-13-8-10-18(21)14(2)7-9-15-16(6-5-11-20(3,4)23)19(22)24-12-17(13)15/h5-6,11,15,17-18,21,23H,1-2,7-10,12H2,3-4H3/b11-5+,16-6 Xeniolide-F cyclonona[c]pyran-3(1H)-one, decahydro-8-hydroxy-4-[(2E)-4-hydroxy-4-methyl-2-pentenylidene]-7,11-bis(methylene)-, (4Z)-