Ji-Yuan Yao

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In the title compound, C(9)H(10)NO(4) (+)·Cl(-)·2H(2)O, both the cation and the anion have crystallographic twofold rotation symmetry; in the former, one N and one C atom lie on the rotation axis. In the crystal structure, the ions and water mol-ecules are linked via O-H⋯O, O-H⋯Cl and N-H⋯Cl hydrogen bonds into layers parallel to (101).
In the mol-ecule of the title compound, C(15)H(13)N(3)O(4), the dihedral angle between the pyrazole and benzene rings is 79.89 (6)°. An intra-molecular C-H⋯O hydrogen bond is present. The crystal structure is stabilized by π-π stacking inter-actions between centrosymmetrically related pyrazole rings with a centroid-centroid distance of 3.500 (3) Å.
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