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In the title compound, C20H19FN2O2, the dihedral angle between the aromatic rings is 62.1 (1)°, and those between the pyrazole ring and the fluoro­benzene and benzoic acid rings are 52.1 (1) and 53.1 (1)°, respectively. In the crystal, mol­ecules are linked into [010] C(7) chains by O—H...N hydrogen bonds.

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In the title compound, C27H22N2O4, the dihedral angles between the central benzene ring and the cyano­benzene ring and the 2H-coumarin ring system (r.m.s. deviation = 0.014 Å) are 22.95 (11) and 75.59 (8)°, respectively. Both terminal C atoms of the pendant diethyl­amino group lie to the same side of the coumarin ring system [deviations = 1.366 (2) and 1.266 (2) Å]. In the crystal, mol­ecules are linked by C—H...O and C—H...N hydrogen bonds and a C—H...π inter­action, generating a three-dimensional network.

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In the title compound, C14H12ClNO4S, the dihedral angle between the chloro- and meth­oxy-substituted benzene rings is 87.40 (1)°. In the crystal, adjacent mol­ecules form inversion-related dimers through strong N—H...O hydrogen bonds, generating R22(8) loops. The dimers are further connected through two C—H...O inter­actions that form C(11) chains and R22(14) loops. Aromatic π–π stacking inter­actions [centroid–centroid separation = 3.8574 (1) Å] are also observed.

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In the title compound, C15H15NO4S, the dihedral angle between the methyl- and meth­oxy-substituted benzene rings is 88.99 (12)°. An intra­molecular C—H...O hydrogen bond occurs. In the crystal, adjacent mol­ecules form inversion-related dimers through strong N—H...O hydrogen bonds, generating R22(8) loops. The dimers are further connected through C—H...O inter­actions that form C(8) chains parallel to (001). Mol­ecules are also connected through other C—H...O hydrogen bonds along the b axis, forming additional C(8) chains. Two aromatic π–π stacking inter­actions [centroid–centroid separations = 3.6150 (1) and 3.6837 (1) Å] generate a three-dimensional architecture.

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In the title compound, C15H15NO4S, the dihedral angle between the benzene rings is 88.87 (1)°. In the crystal, adjacent mol­ecules form inversion dimers through pairs of strong N—H...O hydrogen bonds, generating R22(8) loops. Two C—H...π inter­actions and an aromatic π–π inter­action [centroid–centroid separation = 3.8191 (1) Å] are also observed.

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In the title compound, C15H13F3N2O2·H2O, the dihedral angle between the benzene and pyridine rings is 74.97 (1)°. The –CF3 group attached to the benzene ring is syn to the C=O bond in the adjacent side chain. In the crystal, mol­ecules are linked to one another through the water mol­ecules by strong N—H...O, O—H...O and O—H...N hydrogen bonds, forming a ladder-type network. The benzamide mol­ecules are also linked to one another through C—H...F inter­actions, forming C(6) chains parallel to the b-axis direction. Aromatic π–π stacking inter­actions [centroid–centroid separations = 3.7150 (1) and 3.7857 (1) Å] between adjacent pairs of pyridine and benzene rings are also observed, resulting in a three-dimensional architecture are also observed.
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