Showing structure for 9,19-dihydroxy-3,4,5-trimethoxy-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 2-methylbut-2-enoate