Showing structure for (3as,4r,4as,5r,7s,7as,8s,9r,9ar)-4-(acetyloxy)-5,9-dihydroxy-4a,8-dimethyl-3-methylidene-2-oxo-octahydro-3ah-azuleno[6,5-b]furan-7-yl 2-methylpropanoate