Showing structure for (3as,4s,5r,6r,10r,11ar)-4-(acetyloxy)-6-hydroxy-6,10-dimethyl-3-methylidene-2,7-dioxo-3ah,4h,5h,10h,11h,11ah-cyclodeca[b]furan-5-yl 2-methylprop-2-enoate