Showing structure for (8s,9s,10s,11r)-11-(acetyloxy)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.0²,⁷.0¹⁴,¹⁸]nonadeca-1(12),2(7),3,5,13,18-hexaen-8-yl 3-methylbut-2-enoate