Synonyms: REICHSTEIN'S SUBSTANCE R;REICHSTEIN'S SUBSTANCE ''R'';EPIALLOTETRAHYDRO 'B';3-BETA,11-BETA,21-TRIHYDROXY-5-ALPHA-PREGNAN-20-ONE;3-BETA,5-ALPHA-TETRAHYDROCORTICOSTERONE;5-ALPHA-PREGNAN-3-BETA, 11-BETA, 21-TRIOL-20-ONE;5A-pregnane-3B-11B-21-triol-20-one;Allopregnane-3B,11B,21-triol-20-one