Synonyms: TSAO-U;141706-86-7;141845-83-2;diSilyxyloU TSAO deriv.;AC1L9R7W;(1-(2',5'-Bis-O-(tert-butyldimethylsilyl)-beta-D-ribofuranosyl)uracil)-(R)(ribo)-3'-spiro-5-(4-amino-1,2-oxathiole-2,2-dioxide);(1-(2',5'-Bis-O-(tert-butyldimethylsilyl)-beta-D-xylofuranosyl)uracil)-3'-spiro-5-(4-amino-1,2-oxathiole 2,2-dioxide);[1-[2',5'-Bis-O-(tert-butyldimethylsilyl)-.beta.-D-ribofuranosyl]uracil]-(R)(ribo)-3'-spiro-5-(4-amino-1,2-oxathiole-2,2-dioxide);[1-[2',5'-Bis-O-(tert-butyldimethylsilyl)-.beta.-D-xylofuranosyl]uracil]-3'-spiro-5-[4-amino-1,2-oxathiole 2,2-dioxide]