142102-83-8 3Allyl-2',5'diSilylSpiroU AIDS-003928 AIDS003928 TSAO analog [1-[2',5'-Bis-O-(tert-butyldimethylsilyl)-.beta.-D-ribofuranosyl]-3-N-allyluracil]-3'-spiro-5-(4-amino-1,2-oxathiole-2,2-dioxide)