Showing structure for (3s,3ar,4s,6s,7r,9s,9bs)-6,7,9-trihydroxy-3,6,9-trimethyl-2-oxo-3h,3ah,4h,5h,7h,8h,9bh-azuleno[4,5-b]furan-4-yl (2z)-2-methylbut-2-enoate