Showing structure for 4-(acetyloxy)-1-[5-(3,3-dimethyloxiran-2-yl)-2-methoxyoxolan-3-yl]-9-hydroxy-3b,6,6,9a,11a-pentamethyl-7-oxo-1h,2h,4h,5h,5ah,8h,9h,9bh,10h,11h-cyclopenta[a]phenanthren-10-yl 2-methylbut-2-enoate