Showing structure for 3,9,19-trihydroxy-4,5-dimethoxy-9,10-dimethyl-11-[(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 2-methylbut-2-enoate