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In the title compound, C23H27N3O4, the dihydro­pyridine ring adopts a 1,4B conformation. Intra­molecular C—H...O contacts occur. In the crystal, N—H...O and N—H...N hydrogen bonds and C—H...N contacts connect the mol­ecules into strands along the a-axis direction.

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In the title pyrimidine derivative, C12H16N2OS, the tetra­hydro­pyrimidine ring adopts an envelope conformation with the C atom of the methyl­ene –CH2– group as the flap. In the crystal, N—H...O and N—H...S hydrogen bonds connect mol­ecules into undulating sheets perpendicular to the a axis.

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The asymmetric unit of the title compound, C30H22N2O6, comprises a half-mol­ecule of the cyclo­butane derivative. The least-squares planes defined by the respective C atoms of the aromatic substituents inter­sect at angles of 76.81 (7) and 89.22 (8)° with the least-squares plane defined by the C atoms of the cyclo­butane ring. In the crystal, C—H...O contacts connect the mol­ecules into a three-dimensional network. The shortest centroid–centroid distance between the two different aromatic rings is 3.9601 (8) Å.

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In the title compound, C21H23N3O4S·H2O, the methyl­sulfanyl group is disordered over two sets of sites with site-occupancy factors of 0.631 (11) and 0.369 (11). The dihydro­pyridine ring adopts an E4 conformation. In the crystal, classical O—H...N, O—H...O and N—H...O hydrogen bonds, as well as C—H...O and C—H...S contacts, connect the mol­ecules into a three-dimensional network.

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The asymmetric unit of the title compound, C13H10F3NO3, contains two independent mol­ecules with similar conformations. In the crystal, N—H...O hydrogen bonds link alternating independent mol­ecules into chains in [-110]. In the chain, the quinoline planes of the independent mol­ecules are almost perpendicular to each other, forming a dihedral angle of 89.8 (1)°. π–π inter­actions between the aromatic rings of quinoline bicycles related by inversion centres [for two independent centrosymmetric dimers, the shortest centroid–centroid distances are 3.495 (1) and 3.603 (1) Å] link the hydrogen-bonded chains into layers parallel to (110). Weak C—H...F and C—H...O inter­actions further consolidate the crystal packing.

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The title compound, C24H18BrF3N4O4, is a 1,2,3-triazole derivative featuring, among others, a quinoline-derived substituent. In the crystal, C—H...O, C—H...N and C—H...F contacts connect the mol­ecules into a three-dimensional network. The shortest centroid–centroid distance between two aromatic systems is 3.896 (2) Å and is found between the two different six-membered rings of the quinoline scaffold in neighbouring mol­ecules.

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In the title compound, C19H16F3NO6, a quinoline derivative featuring an annealated furan substituent, the mean planes of the carb­oxy substituents are at an angle of 74.3 (2)°. In the crystal, C—H...O contacts result in undulating chains along [110]. C—H...F contacts also occur. The shortest centroid–centroid distance between rings is 3.3376 (7) Å, involving two furan rings of neighbouring mol­ecules.

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In the title compound, C28H19BrF2O2, the C=C double bond is E-configured. In the crystal, C—H...O and C—H...F contacts connect mol­ecules into planes perpendicular to the c axis. The shortest centroid–centroid distance between two aromatic systems is 3.6745 (12) Å between one of the para-fluoro­phenyl rings and its symmetry-generated equivalent.

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In the title compound, C14H19N3O2, the heterocycle adopts a 1C4 conformation with the N atom being one of the flap atoms. In the crystal, classical N—H...O hydrogen bonds and C—H...O contacts connect the mol­ecules into a three-dimensional network.

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In the title compound, C14H10BrClO2, a twofold halogenated derivative of phenyl­ated phenyl­oxyethanone, the least-squares planes defined by the C atoms of the aromatic rings subtend an angle of 71.31 (17)°. In the crystal, C—H...O contacts connect the mol­ecules into chains along the b-axis direction.
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