Showing structure for (3ar,4s,5ar,6s,8s,9s,9as,9bs)-4,8-dihydroxy-5a-methyl-3-methylidene-2-oxo-octahydrospiro[naphtho[1,2-b]furan-9,2'-oxiran]-6-yl (2e)-2-methylbut-2-enoate