1,7(2H,4bH)-Phenanthrenedione,6,10-bis(acetyloxy)-4-(benzoyloxy)-2-ethenyl-3,4,4a,8,8a,9,10,10a-octahydro-10a-hydroxy-2,4b,8,8-tetramethyl-,[2R-(2a,4a,4aa,4bb,8aa,10a,10ab)]-