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In the mol-ecule of the title compound, C(15)H(13)N(3)O(4), the dihedral angle between the pyrazole and benzene ring planes is 67.7 (1)°. The crystal structure is stabilized by an intra-molecular C-H⋯O hydrogen bond and two weak inter-molecular C-H⋯O inter-actions.
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 crystal structure of the title compound, C(8)H(12)N(+)·Cl(-), all H atoms bonded to the ammonium N atom are hydrogen bonded to the chloride ions, with N⋯Cl distances in the range 3.080 (2)-3.136 (2) Å, resulting in 16-membered macrocyclic rings involving four formula units of the title compound.
The six-membered ring in the title salt, C(5)H(12)NO(+)·Br(-), has a chair conformation. In the crystal, the cations are linked to the anions by N-H⋯Br hydrogen bonds.
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.