Showing structure for (3as,4r,5as,6r,9ar,9bs)-6,9a-dihydroxy-5a-methyl-3,9-dimethylidene-2-oxo-hexahydro-3ah-naphtho[1,2-b]furan-4-yl (2s,3s)-2,3-dimethyloxirane-2-carboxylate