Showing structure for [(1r,2r,3s,3as,3br,5ar,6r,7r,8s,9ar,9bs,11ar)-1-ethenyl-2,3,6,7-tetrahydroxy-9a,11a-dimethyl-tetradecahydro-1h-cyclopenta[a]phenanthren-8-yl]oxidanesulfonic acid