121055-66-1 2,4(1H,3H)-Pyrimidinedione, 1-[3-cyano-3-deoxy-2,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-.beta.-D-xylofuranosyl]- 9-[2,5-Bis-O-(t-butyldimethylsilyl)-3-C-cyano-3-deoxy-.beta.-D-xylopentofuranosyl]adenine AIDS-001181 AIDS001181 Adenine deriv.