Synonyms: 5a-Pregnane-11,20-dione, 3a,17,21-trihydroxy- (7CI,8CI); 3a,17,21-Trihydroxy-5a-pregnane-11,20-dione; 3a,17a,21-Trihydroxy-5a-pregnane-11,20-dione; 3a,5a-Tetrahydrocortisone; Allotetrahydrocortisone; Cortisone, allotetrahydro-;allo-Tetrahydrocortisone