1-(3-Amino-2,3-dideoxy-.beta.-D-ribo-hexofuranosyl)uracil 133488-38-7 2,4(1H,3H)-Pyrimidinedione, 1-(3-amino-2,3-dideoxy-.beta.-D-ribo-hexofuranosyl)- 3NH-D-ribo-ddU deriv. AIDS-002537 AIDS002537