Synthesis of 1-[2′,5′-Bis-O-(t-butyldimethylsilyl)-β-d-xylo- and β-d-ribofuranosyl]thymine-3′-spiro-5″-4″-amino-1″,2″-oxathiole-2″,2″-dioxide (TSAO). A novel type of specific anti-HIV agents | Publicación