NSC123099 Thiourea, N,N'-bis[1,2-dihydro-2-oxo-1-(2,3,5-tri-O-acetyl-.beta.-D-arabinofuranosyl)-4-pyrimidinyl]- Urea, 1,3-bis(1-.beta.-D-arabinofuranosyl-1,2-dihydro-2-oxo-4-pyrimidinyl)-2-thio-, hexaacetate (ester)