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In the title compound, C 20 H 15 ClN 2 O, the non-aromatic six-membered ring adopts a distorted envelope conformation with methylene-C atom nearest to the five-membered ring being the flap atom. The dihedral angle between the phenyl and chlorobenzene rings is 74.5 (1)°. The heterocyclic ring forms dihedral angles of 37.9 (1) and 64.3 (1)° with the phenyl and chlorobenzene rings, respectively. In the crystal, weak C—H...O interactions feature predominantly within the three-dimensional architecture. The intermolecular interactions are further analysed with the calculation of the Hirshfeld surfaces highlighting the prominent role of C—H...O interactions, along with H...H (36.8%) and C...H/H...C (26.5%) contacts.

(E)-5-(4-Chlorobenzylidene)-1-phenyl-4,5,6,7-tetrahydro-1H-indazol-4-one: crystal structure and Hirshfeld surface analysis