Showing structure for (9a,11a-dimethyl-1-{1-methyl-8-methylidene-7-oxo-2,6-dioxabicyclo[3.3.1]nonan-4-yl}-9-oxo-1h,2h,3h,3ah,3bh,4h,6h,7h,8h,9bh,10h,11h-cyclopenta[a]phenanthren-7-yl)oxidanesulfonic acid