1-(3'-Fluoro-2',3'-dideoxy-.alpha.-D-ribofuranosyl)-5-ethyluracil 120713-83-9 2,4(1H,3H)-Pyrimidinedione, 1-(2,3-dideoxy-3-fluoro-.alpha.-D-erythro-pentofuranosyl)-5-ethyl- 3'-FddEtU (alpha) AIDS-000413 AIDS000413 VSA 411