Showing structure for (3ar,4s,6as,8s,9ar,9bs)-8-(acetyloxy)-6a-hydroxy-6-methyl-3,9-dimethylidene-2-oxo-3ah,4h,7h,8h,9ah,9bh-azuleno[4,5-b]furan-4-yl (2z)-2-[(acetyloxy)methyl]but-2-enoate