Showing structure for (1r,3r,4s,6s,8r,9r,10s,11s)-9-(acetyloxy)-8-hydroxy-3,8-dimethyl-12-methylidene-7,13-dioxo-5,14-dioxatricyclo[9.3.0.0⁴,⁶]tetradecan-10-yl 2-methylprop-2-enoate