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The mol­ecule of title compound, C13H11N5, is essentially planar (r.m.s. deviation = 0.0440 Å) and an intra­molecular C—H...N hydrogen bond generates an S(6) motif. In the crystal, mol­ecules are connected into chains by inter­molecular N—H...N and C—H...N hydrogen bonds. In addition, π–π stacking inter­actions are observed between the pyrazole and pyridazine rings [inter­planar distance = 3.6859 (10) Å].
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