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- [5] INTRODUCTION OF THE 11-KETO AND 11-ALPHA-HYDROXY GROUPS INTO RING-C UNSUBSTITUTED STEROIDS .7. STEROIDS .42. STEROIDAL SAPOGENINS .26. THE CHEMICAL REDUCTION OF DELTA-8-11-KETO AND OF SATURATED 11-KETO STEROIDS - A NEW APPROACH TO 11-KETO AND 11-ALPHA-HYDROXY STEROIDS JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1953, 75 (06) : 1282 - 1285