Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.004 Å; R factor = 0.044; wR factor = 0.141; data-to-parameter ratio = 13.8.In the molecule of the title compound, C 19 H 19 N 3 O 2 , the central pyrazole ring makes dihedral angles of 9.89 (3) and 66.06 (5) with the two phenyl rings, and the two phenyl rings form an angle of 74.05 (5) . An intramolecular C-HÁ Á ÁO hydrogen bond forms a six-membered ring, producing an S(6) ring motif. In the crystal structure, intermolecular N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds link each molecule to two others, forming an infinite one-dimensional supramolecular structure along the c axis.
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In the title compound, C14H11BrN2O2, the mean planes of the two benzene rings are almost parallel to each other, making a dihedral angle of 4.09 (1)°. An intramolecular O—H⋯N hydrogen bond occurs. In the crystal, intermolecular O—H⋯N and C—H⋯O hydrogen bonds link the molecules into a chain-like supramolecular structure.
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