Showing structure for methyl 2-[1'-(furan-3-yl)-7'-hydroxy-3a,5,5,7'a-tetramethyl-2-methylidene-3',6-dioxo-6',7'-dihydro-1'h,4h-spiro[1-benzofuran-3,5'-cyclopenta[c]pyran]-4-yl]acetate