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The asymmetric unit of the title compound, NH4 (+)·C11H14N6O7P(-)·0.5H2O, contains one 3'-azido-3'-de-oxy-thymidine-5'amino-carbonyl-phospho-nate (ACP-AZT) anion, half of an NH4 (+) cation lying on a twofold rotation axis and in another position, occupied with equal probabilities of 0.5, an NH4 (+) cation and a water mol-ecule. The amide group of the ACP-AZT anion is disordered (occupancy ratio 0.5:0.5), with one part forming an N-H⋯O (involving C=O⋯H4N(+)) hydrogen bond and the other an O-H⋯N (involving C-NH2⋯OH2) hydrogen bond with the components of the split NH4 (+)/H2O position. The pseudorotation parameters of ACP-AZT set it apart from previously studied AZT and thymidine. In the crystal, the various components are linked by N-H⋯O, O-H⋯O, N-H⋯N, C-H⋯O and C-H⋯N hydrogen bonds, forming a three-dimensional framework.

Crystal structure of ammonium 3′-azido-3′-deoxythymidine-5′-aminocarbonylphosphonate hemihydrate: an anti-HIV agent