Showing structure for (5z)-3-[(1r,3as,5ar,9ar,9br,11as)-3a,6,6,9a,11a-pentamethyl-7-oxo-1h,2h,3h,5h,5ah,8h,9h,9bh,10h,11h-cyclopenta[a]phenanthren-1-yl]-5-(2-methylprop-2-en-1-ylidene)furan-2-one