Showing structure for (3ar,4s,5ar,6s,9r,9as,9bs)-4-hydroxy-5a-methyl-3-methylidene-2-oxo-octahydrospiro[naphtho[1,2-b]furan-9,2'-oxiran]-6-yl (2s,3s)-2,3-dimethyloxirane-2-carboxylate