Showing structure for (8s,9s,10s,11r)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-11-(propanoyloxy)-15,17-dioxatetracyclo[10.7.0.0²,⁷.0¹⁴,¹⁸]nonadeca-1(12),2,4,6,13,18-hexaen-8-yl (2z)-2-methylbut-2-enoate