1-(2,3-Dideoxy-2,3-difluoro-.beta.-D-arabinofuranosyl)uracil 128496-18-4 2',3'-diF-arabino-ddU 2,4(1H,3H)-Pyrimidinedione, 1-(2,3-dideoxy-2,3-difluoro-.beta.-D-arabinofuranosyl)- AIDS-001467 AIDS001467