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1.  4-[3,4-Dimethyl-1-(4-methyl­phen­yl)-5-oxo-4,5-dihydro-1H-pyrazol-4-yl]-3,4-dimethyl-1-(4-methyl­phen­yl)-4,5-dihydro-1H-pyrazol-5-one 
In the title compound, C24H26N4O2, the complete mol­ecule is generated by the application of twofold symmetry. The pyrazole ring is approximately planar [r.m.s. deviation = 0.026 Å] and the benzene ring is twisted out of this plane [dihedral angle = 21.94 (7)°]. A twist in the mol­ecule about the central C—C bond [1.566 (3) Å] is also evident [C—C—C—C torsion angle = 44.30 (14)°]. Supra­molecular layers in the bc plane are formed in the crystal packing via C—H⋯O and C—H⋯π inter­actions.
doi:10.1107/S1600536812009208
PMCID: PMC3343962  PMID: 22590043

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