Showing structure for (3r,3as,5r,6s,7s,8s,8ar)-7-[(2e)-but-2-enoyl]-5,7-dihydroxy-3,6-dimethyl-2-oxo-hexahydro-3h-cyclohepta[b]furan-8-yl (2z)-2-methylbut-2-enoate