Showing structure for methyl (1r,2e,4s,6r,7e,9s,10s,11r)-10-{[(2s,3s)-3-(acetyloxy)-2-hydroxy-2-methylbutanoyl]oxy}-3-methyl-9-{[(2e)-2-methylbut-2-enoyl]oxy}-12-methylidene-13-oxo-5,14-dioxatricyclo[9.3.0.0⁴,⁶]tetradeca-2,7-diene-8-carboxylate