2'-Deoxytetrahydrouridine 2(1H)-Pyrimidinone, 1-(2-deoxy-beta-D-erythro-pentofuranosyl)tetrahydro-4-hydroxy- 3,4,5,6-Tetrahydrodeoxyuridine 31962-88-6 THDU Tetrahydro-2'-deoxyuridine