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In the title compound, C21H21BrClNO4, the dihydro­pyridine ring adopts a flattened boat conformation. The 3-bromo-5-chloro-2-hy­droxy­phenyl ring forms a dihedral angles of 84.44 (7)° with the dihydro­pyridine mean plane. The mol­ecular conformation is stabilized by an intra­molecular O—H...O hydrogen bond, with an S(8) ring motif. In the crystal, O—H...O and C—H...O hydrogen bonds link the mol­ecules, forming a three-dimensional network.

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In the title compound, C19H17NO2, the dihedral angle between the benzene ring and the naphthalene ring system is 9.72 (5)°, while the torsion angle of the C—N—C—C bridging group is 179.24 (17)°. The methyl group of the 1-phenyl­ethanol moiety is disordered over two positions with a refined occupancy ratio of 0.775 (5):0.225 (5). The mol­ecular conformation is stabil­ized by an intra­molecular N—H...O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked by O—H...O hydrogen bonds, forming zigzag chains propagating along the c-axis direction. Neighbouring chains are linked via C—H...O inter­actions, forming a two-dimensional slab-like network parallel to the bc plane.

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The mol­ecular conformation of the title compound, C13H8BrFN2O3, is essentially planar, with maximum deviations of 0.076 (1) and −0.080 (2) Å for the O atoms of the NO2 group. The mol­ecular conformation is stabilized by an intra­molecular O—H...N hydrogen bond, forming an S(6) ring motif. In the crystal, pairs of mol­ecules are linked via two pairs of C—H...O hydrogen bonds, forming inversion dimers that enclose R22(7)R22(10)R22(7) ring motifs.

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In the title mol­ecule, C14H15NO3, the ring system is essentially planar, with an r.m.s. deviation of 0.003 Å. The atoms of the ethane-1,2-diol group were refined as disordered over two sets of sites in a ratio of 0.815 (3):0.185 (3). The mol­ecular conformation is stabilized in part by an intra­molecular N—H...O hydrogen bond, which forms an S(6) ring. In the crystal, mol­ecules are connected by N—H...O and O—H...O hydrogen bonds, forming a two-dimensional network parallel to (100). The network also features weak C—H...O hydrogen bonds. Weak C—H...π inter­actions also observed.

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In the title compound, C14H13N3O2S, the dihedral angle between the thio­phene and phenyl rings is 24.95 (8)°. The mol­ecular structure is consolidated by intra­molecular N—H...O and C—H...S inter­actions. The crystal structure features N—H...N and N—H...O hydrogen bonds forming centrosymmetric R22(12) dimers, which are linked into a two-dimensional network parallel to (011) with an S(6)R22S(6) motif. In addition, π–π stacking inter­actions [centroid–centroid distance = 3.7013 (12) Å] occur between the thio­phene and phenyl rings of adjacent mol­ecules.

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In the title compound, C16H14O4, the benzene rings are inclined at a dihedral angle of 75.14 (9)°. The torsion angle of the bridging O—C—C—O group is −76.50 (11)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming C(6) chains along [100]. Furthermore, C—H...π inter­actions and π–π stacking inter­actions [centroid–centroid distances = 3.6957 (7) and 3.6735 (8) Å] contribute to the stability of the crystal packing.

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In the title compound, C12H7N3OS, the five-membered 1,3-thia­zolidine ring is nearly planar [maximum deviation = 0.032 (2) Å] and makes a dihedral angle of 84.14 (9)° with the phenyl ring. In the crystal, mol­ecules are linked by C—H...N hydrogen bonds into infinite chains along [-101]. C—H...π inter­actions contribute to the arrangement of the mol­ecules into layers parallel to (101).
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