European Pharmacopoeia (EP) Reference Standard Synonym(s): 1,4-Pregnadiene-11β,17α,21-triol-3,20-dione; 1-Dehydrocortisol; 1-Dehydrohydrocortisone; 11β,17α,21-Trihydroxy-1,4-pregnadiene-3,20-dione Empirical Formula: C21H28O5 Formula Weight: 360.44...