Showing structure for (2e,6r)-6-[(2's,3r,5ar,9ar,9bs)-2',6,6,9a-tetramethyl-5'-methylidene-7-oxo-2,5,5a,8,9,9b-hexahydro-1h-spiro[cyclopenta[a]naphthalene-3,1'-cyclopentan]-2'-yl]-2-methyl-4-oxohept-2-enoic acid