Synonyms: 1-(2,5-Bis-O-(t-butyldimethylsilyl)-3-C-cyano-3-deoxy-beta-D-xylopentofuranosyl)uracil;1-[2,5-Bis-O-(t-butyldimethylsilyl)-3-C-cyano-3-deoxy-B-D-xylopentofuranosyl]uracil;2,4(1H,3H)-Pyrimidinedione, 1-(3-cyano-3-deoxy-2,5-bis-O-((1,1-dimethylethyl)dimethylsilyl)-beta-D-xylofuranosyl)-;2,4(1H,3H)-Pyrimidinedione, 1-[3-cyano-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-.beta.-D-xylofuranosyl]-