1-(5,6-Di-O-acetyl-2,3-dideoxy-3-phthalimido-2,3-dideoxy-.alpha.-D-arabino- hexofuranosyl)-5-fluorouracil 133488-20-7 2,4(1H,3H)-Pyrimidinedione, 1-[5,6-di-O-acetyl-2,3-dideoxy-3-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-.alpha.-D-arabino-hexofuranosyl]-5-fluoro- AIDS-002520 AIDS002520 DiOAcPhthN-D-arab-ddU deriv.