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