Experimental

R factor = 0.037; wR factor = 0.111; data-to-parameter ratio = 24.0. In the title compound, C17H14Cl2N2O, the dihedral angles between the pyrazole ring and the mean planes of the benzene and chloro-substituted benzene rings are 75.97 (1) and 16.63 (1) respectively. In the crystal, two weak C—H O intermolecular hydrogen bonds and – stacking interactions [centroid–centroid distances = 3.774 (4) and 3.716 (7) Å] are observed. Related literature For the antitumor, antibacterial, antifungal, antiviral, anti-parasitic, anti-tubercular and insecticidal properties of substituted pyrazolines, see: Hes et al. (1978); Manna et al. (2005); Amir et al. (2008). For their anti-inflammatory, anti-diabetic, anaesthetic and analgesic properties, see: Regaila et al. (1979). For their use in organic synthesis, see: Klimova et al. (1999); Bhaskarreddy et al. (1997). For a continuation of the work on pyrazoline derivatives, see: Samshuddin et al. (2010); Fun et al. (2010); Yathirajan et al. (2007a,b); Butcher et al