| Summary: | In the title molecule, C10H8N2O, the five- and six-membered rings form a dihedral angle of 10.14 (9)°. The aldehyde group is almost coplanar with the pyrazole ring to which it is connected [O—C—C—C torsion angle = −179.35 (17)°]. In the crystal, inversion dimers are linked by four C—H...O interactions as the carbonyl O atom accepts two such bonds. The dimeric aggregates are linked into supramolecular layers in the ac plane by C—H...π and π–π [ring centroid(pyrrole)...ring centroid(phenyl) = 3.8058 (10) Å] interactions.
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