2'-Deoxy-4-thiouridine 2(1H)-Pyrimidinone, 1-(2-deoxy-.beta.-D-erythro-pentofuranosyl)-3,4-dihydro-4-thioxo- 4-Thio-2'-deoxyuridine 4-Thiodeoxyuridine 5580-20-1 NSC517771 Uridine, 2'-deoxy-4-thio-