(4-OH-3-ureido-Bu)Thymine 1-(3-R-4-hydroxy-3-ureido-butyl)thymine acyclonucleoside 131652-63-6 AIDS-001810 AIDS001810 Urea, [3-(3,4-dihydro-5-methyl-2,4-dioxo-1(2H)-pyrimidinyl)-1-(hydroxymethyl)propyl]-, (R)-