Showing structure for (3s,3ar,4r,5r,9ar,9bs)-4-(acetyloxy)-9a-hydroxy-3,6,9-trimethyl-2-oxo-3h,3ah,4h,5h,7h,9bh-azuleno[4,5-b]furan-5-yl (2z)-2-methylbut-2-enoate