Showing structure for (2's,3r,5ar,9as)-2',6,6,9a-tetramethyl-5'-methylidene-2'-[(2r)-4-oxopentan-2-yl]-2,4,5,5a,8,9-hexahydro-1h-spiro[cyclopenta[a]naphthalene-3,1'-cyclopentan]-7-one