1-(3-Amino-2,3-dideoxy-.beta.-D-ribo-hexofuranosyl)-5-chlorouracil 133488-41-2 2,4(1H,3H)-Pyrimidinedione, 1-(3-amino-2,3-dideoxy-.beta.-D-ribo-hexofuranosyl)-5-chloro- 3NH-D-ribo-ddU deriv. AIDS-002540 AIDS002540