Showing structure for (4s,6r,6as,9r,10s,10as)-6,10-bis(acetyloxy)-3-[(acetyloxy)methyl]-6a,9-dihydroxy-6,9-dimethyl-2-oxo-4h,5h,7h,8h,10h-naphtho[4a,4-b]furan-4-yl (2e)-2-methylbut-2-enoate