title: 2-14C-1-(2'-deoxy-beta-D-ribofuranosyl)-5-ethyluracil: synthesis and biotransformation in rats.
abstract: With 14C-urea as the starting material, 2-14C-1-(2'-deoxy-beta-D-ribofuranosyl)-5-ethyluracil [2-14C-beta-5-ethyl-2'-deoxyuridine] was synthesized for metabolic studies. After intravenous administration in rats, the radioactivity disappeared in the blood within 72 hr, being eliminated primarily in the urine (97%). The major elimination took place in the first 24 hr (92%). Little radioactivity was detected in the organs and tissues after 3 days. Approximately 50% of the urine radioactivity probably was due to an unidentified conjugate, 30% was due to Metabolite II, and 20% was unchanged drug. Metabolite II was identified as 5-ethyluracil by mass and 1H-NMR spectra and by comparison with an authentic sample.
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000378:metabolism*; D001711:Biotransformation; D003857:Deoxyuridine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D013058:Mass Spectrometry; D051381:Rats; D014018:Tissue Distribution
chemical_list: D000998:Antiviral Agents; C022811:edoxudin; D003857:Deoxyuridine