Showing structure for methyl (1r,2s,6r,7r,9s)-7-{[(2s)-2-hydroxy-2-methylbut-3-enoyl]oxy}-9-methyl-5-methylidene-4-oxo-3,14-dioxatricyclo[7.4.1.0²,⁶]tetradec-12-ene-13-carboxylate