Synonyms: Pregn-4-en-3-one,11b,17,20b,21-tetrahydroxy- (6CI,7CI,8CI); 11b,17,20b,21-Tetrahydroxy-4-pregnen-3-one; 11b,17a,20b,21-Tetrahydroxy-pregn-4-en-3-one;17-(1,2-Dihydroxyethyl)androsten-3-one-11,17-diol; 20b-Dihydrocortisol; 20b-Hydroxycortisol; 4-Pregene-11b,17a,20b,21-tetrol-3-one; 4-Pregnene-11b,17a,20b,21-tetrol-3-one; Pregn-4-en-11b,17a,20b,21-tetrol-3-one; Pregn-4-ene-11b,17a,20b,21-tetraol-3-one; Reichstein'scompound E; Reichstein's substance E; D4-Pregnene-11b,17a,20b,21-tetraol-3-one