(2',5'-Bis-O-(tert-butyldimethylsilyl)-beta-ribofuranosyl)-3'-spiro-5''-(4''-amino-1'',2''-oxathiole-2'',2''-dioxide)thymine 141781-17-1 2,4(1H,3H)-Pyrimidinedione, 1-(4-amino-9-(((1,1-dimethylethyl)dimethylsilyl)oxy)-6-((((1,1-dimethylethyl)dimethylsilyl)oxy)methyl)-1,7-dioxa-2-thiaspiro(4,4)non-3-en-8-yl)-5-methyl-, S,S-dioxide. (5R-(5alpha,6beta,8beta,9alpha))- Tsao-T