Showing structure for (3s,3ar,4s,6s,6as,9s,9ar,9bs)-3-(acetyloxy)-6,9-dihydroxy-3,6,9-trimethyl-2-oxo-3ah,4h,5h,6ah,9ah,9bh-azuleno[4,5-b]furan-4-yl (2e)-2-methylbut-2-enoate