(8S,8’S,9S,9’S,10R,10’R,13S,13’S,14S,14’S,17R,17’R)-17,17′-(2,3-dihydroxysuccinyl)bis(17-hydroxy-10,13-dimethyl-7,8,9,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthrene-3,11(6H)-dione)