Showing structure for (1r,3br,4r,5ar,9ar,9br,11as)-3b,6,6,9a,11a-pentamethyl-2,7-dioxo-1-(2-oxo-5h-furan-3-yl)-1h,4h,5h,5ah,9bh,10h,11h-cyclopenta[a]phenanthren-4-yl acetate