Showing structure for methyl (1s,4r,6s,9s,10r,11s)-10-[(2s,3r)-2,3-dimethyloxirane-2-carbonyloxy]-9-hydroxy-3-methyl-12-methylidene-13-oxo-5,14-dioxatricyclo[9.3.0.0⁴,⁶]tetradeca-2,7-diene-8-carboxylate