Showing structure for (3ar,4s,5ar,6r,9s,9as,9bs)-9-formyl-6-hydroxy-5a-methyl-3-methylidene-2-oxo-octahydro-3ah-naphtho[1,2-b]furan-4-yl (2e)-4-(acetyloxy)-2-(hydroxymethyl)but-2-enoate