Publications by authors named "Yi Qi Chang"

In the title compound, 2C11H18N(+)·2PF6 (-)·C12H24O6, the 18-crown-6 mol-ecule has crystallographically imposed inversion symmetry. In the crystal, it inter-acts with the cation through weak C-H⋯O hydrogen bonds. The cations and anions are further linked via N-H⋯F and C-H⋯F hydrogen bonds, leading to a sandwich structure .

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The asymmetric unit of the title compound, 2C15H16N6O3·C3H7NO·H2O, contains two independent ethyl 6-methyl-2-oxo-4-[4-(1H-tetra-zol-5-yl)phen-yl]-1,2,3,4-tetra-hydro-pyrim-id-ine-5-carboxyl-ate mol-ecules, in which the dihedral angles between the tetra-zole and benzene rings are 20.54 (12) and 12.13 (12)°.

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