Showing structure for (2z,4r,8s,9s,10r,11r)-10-(acetyloxy)-2,11-dimethyl-7-methylidene-6,12-dioxo-5,14-dioxatricyclo[9.2.1.0⁴,⁸]tetradeca-1(13),2-dien-9-yl 3-methylbutanoate