Showing structure for 3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.0²,⁷.0¹⁴,¹⁸]nonadeca-1(19),2(7),3,5,12,14(18)-hexaen-11-yl 2-methylbut-2-enoate