Showing structure for (3as,4s,5r,9ar,9br)-5-(acetyloxy)-8-chloro-6,9-dimethyl-3-methylidene-2,7-dioxo-3ah,4h,5h,9ah,9bh-azuleno[4,5-b]furan-4-yl (2e)-2-[(acetyloxy)methyl]but-2-enoate