Showing structure for (2r)-2-[(1r,3as,5ar,9as,11as)-3a,6,6,9a,11a-pentamethyl-7-oxo-1h,2h,3h,4h,5h,5ah,8h,9h,10h,11h-cyclopenta[a]phenanthren-1-yl]-6-methylhept-5-enoic acid