Showing structure for (3z,3as,5ar,7s,9ar,9bs)-3-[(3e,5e)-6,10-dimethyl-7-oxoundeca-3,5,9-trien-2-ylidene]-3a,6,6,9a-tetramethyl-2-oxo-octahydrocyclopenta[a]naphthalen-7-yl acetate