Showing structure for (1r,3s,7r,8r,9z)-1,10-dimethyl-6-methylidene-5,13-dioxo-4,14-dioxatricyclo[9.2.1.0³,⁷]tetradeca-9,11-dien-8-yl (2s,3r)-2,3-dimethyloxirane-2-carboxylate