Showing structure for (4ar,5r,6s,7s,8s,8ar,9as)-8,9a-dihydroxy-3,4a,5-trimethyl-6-{[(2z)-2-methylbut-2-enoyl]oxy}-2-oxo-4h,5h,6h,7h,8h,8ah,9h-naphtho[2,3-b]furan-7-yl (2e)-2-methylbut-2-enoate