Showing structure for (1s,3r,5s,6s,10r,11s)-3-methyl-9-methylidene-8,14-dioxo-4,7,15-trioxatetracyclo[11.2.1.0³,⁵.0⁶,¹⁰]hexadec-13(16)-en-11-yl 2-methylprop-2-enoate