Showing structure for (1ar,3ar,4r,5r,5'r,7r,7as,7bs)-5'-(furan-3-yl)-3a-hydroxy-5,7a,7b-trimethyl-2'-oxo-hexahydrospiro[naphtho[1,2-b]oxirene-4,3'-oxolan]-7-yl (2z)-2-methylbut-2-enoate