Synonyms: 2,4(1H,3H)-Pyrimidinedione, 1-(3-azido-2,3-dideoxy-2-fluoro-5-O-(hydroxymethylphosphinyl)-beta-D-arabinofuranosyl)-5-methyl-;2,4(1H,3H)-Pyrimidinedione, 1-[3-azido-2,3-dideoxy-2-fluoro-5-O-(hydroxymethylphosphinyl)-b-D-arabinofuranosyl]-5-methyl-