1-((2R,4S,5R)-4-Hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-1-H-pyrimidine-2,4-dione 2-Deoxyuridine 951-78-0 AIDS-113822 AIDS113822 Deoxyribose uracil Deoxyuridine NSC23615 Uracil deoxyriboside