(1Z)-Phthalazin-1(2H)-one iso­propyl­­idene­hydrazone

The crystal structure of the title compound, C11H12N4, is stabilized by an N—H⋯N and three C—H⋯N inter­molecular hydrogen bonds. The N—H⋯N hydrogen bonds generate centrosymmetric R22(6) rings, while the three C—H⋯N hydrogen bonds forms edge-fused R22(7)R22(7)R22(10) ring motifs. Except for four H atoms of the methyl groups, all atoms are in the same plane and the dihedral angles between the aromatic and heterocyclic rings and the substituent group plane are 1.87 (5) and 1.53 (5)°, respectively