Synonyms: 1-(3-Fluoro-2,3-dideoxy-.alpha.-D-ribofuranosyl)-5-propyluracil;1-(3-Fluoro-2,3-dideoxy-alpha-D-ribofuranosyl)-5-propyluracil;2,4(1H,3H)-Pyrimidinedione, 1-(2,3-dideoxy-3-fluoro-.alpha.-D-erythro-pentofuranosyl)-5-propyl-;2,4(1H,3H)-Pyrimidinedione, 1-(2,3-dideoxy-3-fluoro-alpha-D-erythro-pentofuranosyl)-5-propyl-