Showing structure for (3ar,4r,5ar,6r,9bs)-6-hydroxy-5a,9-dimethyl-3-methylidene-2-oxo-3ah,4h,5h,6h,7h,8h,9bh-naphtho[1,2-b]furan-4-yl (2s,3r)-2,3-dimethyloxirane-2-carboxylate