Antitumors for Research and Experimental Use;Biochemistry;Hydroxyketosteroids;Steroids;Intermediates & Fine Chemicals;Pharmaceuticals;Steroid and Hormone;1,2-Dehydrocortisone;1,4-pregnadiene-16-alpha,21-diol-3,11,20-trione;11,20-trione,17,21-dihydroxy-pregna-4-diene-3;11,20-trione,17,21-hydroxy-pregna-4-diene-3;Ancortone;Bicortone;Colisone;Cortan;