Showing structure for (4s,4as,5r,6s,8ar)-3,4a-dimethyl-6-{[(2z)-2-methylbut-2-enoyl]oxy}-4-[(2-methylpropanoyl)oxy]-4h,5h,6h,7h,8h,8ah,9h-naphtho[2,3-b]furan-5-carboxylic acid