Showing structure for (2z,6s)-6-[(1r,1's,2s,3as,3'as,7as,7'as)-2-hydroxy-3'a,4,4,7a,7'a-pentamethyl-4',5-dioxo-octahydro-1'h,2h-1,5'-spirobi[inden]-1'-yl]-2-methylhept-2-enoic acid