((2S,5R)-5-(4-Amino-2-oxopyrimidin-1(2H)-yl)tetrahydrofuran-2-yl)methyl Phosphorodiamidate is an intermediate in the synthesis of Zalcitabine Triphosphate Trisodium Salt (Z140050), which has the free acid form of Zalcitabine Triphosphate. Zalcitabine Triphosphate can serve as an inhibitor of viral RNA synthesis and it is a metabolite of Zalcitabine.