Showing structure for (2e,4s)-4-[(1s,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]pent-2-enoic acid