Showing structure for (3ar,4r,5r,9ar,9bs)-4-(acetyloxy)-9a-hydroxy-6,9-dimethyl-3-methylidene-2-oxo-3ah,4h,5h,7h,9bh-azuleno[4,5-b]furan-5-yl (2s,3r)-2,3-dimethyloxirane-2-carboxylate