Bis-(6α-Methylprednisolone) 21,21�-Ether; Methylprednisolone 21,21�-dimer; 1-((6S,9S,10R,11S,13S,14S,17R)-11,17-dihydroxy-6,10,13-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2,3-dihydroxy-4-((6R,9R,10S,11R,13R,14R)-11-hydroxy-6,10,13-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)butane-1,4-dione,Methylprednisolone