1-[2,5-Bis-O-(t-butyldimethylsilyl)-3-C-cyano-3-deoxy-B-D-xylopentofuranosyl]uracil 121055-64-9 2,4(1H,3H)-Pyrimidinedione, 1-[3-cyano-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-.beta.-D-xylofuranosyl]- AIDS-001179 AIDS001179 Uracil deriv.