Showing structure for (3ar,4r,6r,8r,8ar,9ar)-8-hydroxy-5,8a-dimethyl-3-methylidene-4-[(2-methylprop-2-enoyl)oxy]-2-oxo-3ah,4h,6h,7h,8h,9h,9ah-naphtho[2,3-b]furan-6-yl (2r)-2-methylbutanoate