1-(5,6-Di-O-acetyl-3-phthalimido-2,3-dideoxy-.alpha.-D-arabino-hexafuranosyl)uracil 133488-18-3 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]- AIDS-002518 AIDS002518 DiOAcPhthN-D-arab-ddU deriv.