142102-82-7 3DiMeAllyl-2',5'diSilylSpiroT AIDS-003922 AIDS003922 TSAO analog [1-[2',5'-Bis-O-(tert-butyldimethylsilyl)-.beta.-D-ribofuranosyl]-3-N-(3-methyl-2-butenyl)thymine]-3'-spiro-5-(4-amino-1,2-oxathiole-2,2-dioxide)