22.alpha.-Spirost-5-en-3.beta.-ol 512-04-9 DIOSGENIN NSC33396 Nitogenin SP 37 Spiro[8H-naphth[2',1':4,5]-indeno[2,1-b]furan-8,2'-[2H]-pyran]-2-ol, 1,2,3,3',4,4',4a,4b,5,5',6,6',6a,6b,7,9a,10,10a,10b,11-eicosahydro-4a,5',6a,7-tetramethyl- Spirost-5-en-3-ol, (3.beta.,25R)- Spirost-5-en-3.beta.-ol, (25R)-