Showing structure for (1r,3s,5r,8e,10s,11r,12r)-3,8,12-trimethyl-12-{[(2z)-2-methylbut-2-enoyl]oxy}-13-oxo-4,14-dioxatricyclo[9.3.0.0³,⁵]tetradec-8-en-10-yl (2z)-2-methylbut-2-enoate