1-(5,6-Di-O-acetyl-2,3-dideoxy-3-phthalimido-.alpha.-D-arabino-hexofuranosyl)-5-chlorouracil 133488-21-8 2,4(1H,3H)-Pyrimidinedione, 5-chloro-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-002521 AIDS002521 DiOAcPhthN-D-arab-ddU deriv.