Showing structure for (3ar,4s,5ar,6s,9s,9as,9bs)-6-{[2-(hydroxymethyl)prop-2-enoyl]oxy}-5a-methyl-3-methylidene-2-oxo-octahydrospiro[naphtho[1,2-b]furan-9,2'-oxiran]-4-yl 3-methylbutanoate