1-(3-C-Cyano-2,3-dideoxy-.beta.-D-arabino-pentofuranosyl)thymineCNdd(ara)PentFurT 117174-38-6 2,4(1H,3H)-Pyrimidinedione, 1-(3-cyano-2,3-dideoxy-.beta.-D-threo-pentofuranosyl)-5-methyl- AIDS-001191 AIDS001191