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In the title mol­ecule, C16H14N2O, the dihedral angle between the two phenyl rings is 23.5 (6)°. In the crystal, N-H-O hydrogen bonds link mol­ecules into chains running along the a axis.

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The asymmetric unit of the title compound, C8H7N3O5, contains two independent mol­ecules in which the amide plane is oriented at dihedral angles of 29.82 (2) and 31.17 (2)° with respect to the benzene ring. In the crystal, mol­ecules are connected via inter­molecular N—H...O hydrogen bonds, forming chains running along the b axis.

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In the title compound, C20H13ClN2O2S, the chloro­phenyl, phenyl and thienoyl rings are oriented at dihedral angles 17.84 (7), 53.13 (8) and 34.03 (8)°, respectively, to the central pyrazole ring. An intra­molecular O—H...O hydrogen bond occurs. In the crystal, pairs of bifurcated O—H...O hydrogen bonds link mol­ecules into inversion dimers with R22(12) graph-set motifs.
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