94237-40-8 EINECS 304-136-4 Pregn-4-ene-3,20-dione, 21,21'-(phosphinicobis(oxy))bis(11,17-dihydroxy-, monosodium salt, (11beta)-(11'beta)-, compd. with (11beta)-11,17,21-trihydroxypregn-4-ene-3,20-dione (1:1)