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