Acta Cryst. (2012). E68, o2784 [ doi:10.1107/S1600536812036045 ]
Abstract: In the title compound, C10H9N5, the phenyl ring is twisted with respect to the pyrazole ring, forming a dihedral angle of 24.00 (6)°. In the crystal, molecules are linked by N-HN hydrogen bonds into chains running parallel to  containing alternating R22(6) and R22(12) rings. Further interactions are found in the crystal, viz. N-H(phenyl) interactions and weak face-to-face - stacking interactions [centroid-centroid distance = 3.8890 (6) Å] between the centroids of the pyrazole and phenyl rings are observed.
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