Showing structure for methyl (3e,3as,5ar,6r,7r,9ar,9bs)-7-(acetyloxy)-3-[(3e,5e,7e)-9,10-dihydroxy-6,10-dimethylundeca-3,5,7-trien-2-ylidene]-3a,6,9a-trimethyl-2-oxo-octahydrocyclopenta[a]naphthalene-6-carboxylate