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The title compound, C 17 H 18 N 6 O 2 ·0.5CH 3 OH, exists in the double keto form and adopts a highly puckered geometry, stabilized by intra­molecular N—H⋯O and N—H⋯N hydrogen bonds. Inter­molecular N—H⋯N hydrogen bonds and π–π stacking inter­actions [centroid–centroid separation = 3.654 (1) Å] assemble the mol­ecules into chains running in the [111] direction. The methanol solvent mol­ecule is disordered over two sites related by inversion and forms a bifurcated O—H⋯(N,O) hydrogen bond.

3,5-Dimethyl-1-(2-pyridylcarbonyl)-5-[(2-pyridylcarbonyl)hydrazino]-2-pyrazoline methanol hemisolvate