Showing structure for (1's,3r,3's,4's,5r,6'r,7'r)-5-(furan-3-yl)-3',6',7'-trimethyl-2,8'-dioxo-9'-oxaspiro[oxolane-3,2'-tricyclo[5.2.2.0¹,⁶]undecan]-4'-yl 2-methylbut-2-enoate