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The title compound, C19H25N5, adopts pseudo-C2 symmetry in which the non-substituted N atoms of the pyrazole rings are on opposite sides of the pyridine plane. The packing involves C—H...π, π–π, C—H...N and hydro­phobic CH3...CH3 inter­actions, which are responsible for the observed columnar arrangement.

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The title mol­ecular complex, C9H7NO·C7H5NO4, owes its formation to an inter­molecular hydrogen bond between the O—H and N—O groups, with an O...O distance of 2.514 (2) Å. The dihedral angle between the planes of the isoquinoline N-oxide and nitro­benzoic acid rings of the complex is 49.91 (4)°. The crystal structure exhibits overlap between the aromatic rings of the mol­ecules in the [101] direction.
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