Showing structure for methyl (2e,7e)-9-(acetyloxy)-10-{[3-(acetyloxy)-2-hydroxy-2-methylbutanoyl]oxy}-3-methyl-12-methylidene-13-oxo-5,14-dioxatricyclo[9.3.0.0⁴,⁶]tetradeca-2,7-diene-8-carboxylate