Showing structure for methyl (1r,3br,6r,9ar,9br,10r,11r,11as)-5,10-bis(acetyloxy)-1-[5-(acetyloxy)-2-oxo-5h-furan-3-yl]-3b,6,9a,11a-tetramethyl-11-[(2-methylpropanoyl)oxy]-4,7-dioxo-1h,2h,9bh,10h,11h-cyclopenta[a]phenanthrene-6-carboxylate