Acta Cryst. (2014). E70, o1-o2 [ doi:10.1107/S1600536813032224 ]
Abstract: The asymmetric unit of the title compound, 2C15H16N6O3·C3H7NO·H2O, contains two independent ethyl 6-methyl-2-oxo-4-[4-(1H-tetrazol-5-yl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxylate molecules, in which the dihedral angles between the tetrazole and benzene rings are 20.54 (12) and 12.13 (12)°. An intramolecular C-HO hydrogen bond occurs in each molecule. In the crystal, N-HO, N-HN, O-HO and O-HN hydrogen bonds, as well as weak C-HO and C-HN hydrogen bonds, link the molecules into a three-dimensional supramolecular architecture. - stacking is also observed between parallel tetrazole rings of adjacent molecules, the centroid-centroid distance being 3.482 (6) Å.
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