Showing structure for (8r,9s,10s,11s)-3,9-dihydroxy-4,5,19-trimethoxy-9,10-dimethyl-11-{[(2z)-2-methylbut-2-enoyl]oxy}-15,17-dioxatetracyclo[10.7.0.0²,⁷.0¹⁴,¹⁸]nonadeca-1(19),2(7),3,5,12,14(18)-hexaen-8-yl (2z)-2-methylbut-2-enoate