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In the title compound, C13H15N3S, the 4,5-di­hydro-3H-1,2,4-triazole ring is nearly planar [maximum deviation = 0.020 (1) Å], while the cyclo­hexane ring adopts a chair conformation. The dihedral angle between the 4,5-di­hydro-3H-1,2,4-triazole ring and the phenyl ring is 74.68 (7)°. No specific inter­molecular inter­actions are discerned in the crystal packing.

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In the title compound, C24H21N3S, the thia­zole ring makes dihedral angles of 52.03 (6), 62.63 (6) and 12.35 (6)°, respectively, with the two phenyl rings and the benzene ring. In the crystal, weak C—H...π inter­actions occur between inversion-related mol­ecules.

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The asymmetric unit of the title compound, C21H19N3O3S, contains two independent mol­ecules. In one mol­ecule, the 1,3-thia­zolidine ring forms dihedral angles of 86.19 (8) and 8.37 (8)° with the phenyl and benzene rings, respectively. The corresponding dihedral angles in the other mol­ecule are 69.60 (7) and 14.08 (7)°. The dihedral angle between the phenyl and benzene rings is 84.70 (8)° in one mol­ecule and 69.62 (8)° in the other. In the crystal, mol­ecules pack in layers approximately parallel to (10-2). There are weak C—H...O hydrogen bonds within these layers. Further weak C—H...O hydrogen bonding occurs between the layers to form a three-dimensional network. A weak C—H...π inter­action is also observed.

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In the title compound, C20H17N3O4S, all non-H atoms, except those of the phenyl ring, are approximately coplanar [maximum deviation = 0.2214 (1) Å], and the dihedral angle between their best plane and the benzene ring is 53.13 (1)°. A short intra­molecular O...S contact of 2.838 (1) Å is formed between the ester carbonyl O atom and the S atom of the thia­zolidine ring. In the crystal, mol­ecules associated via O—H...O, C—H...O and C—H...S hydrogen bonds form layers parallel to (010), with only C—H...O-type short contacts between the mol­ecules in adjacent layers.

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In the title compound, C24H20BrN3S, the di­hydro­thia­zole ring is approximately planar, with a maximum deviation of 0.008 (2) Å, and is twisted with respect to the 4-bromo­phenyl ring, the phenyl ring and methyl­phenyl ring, making dihedral angles of 47.96 (8), 59.52 (9) and 16.96 (9)°, respectively. In the crystal, weak C—H...π inter­actions link inversion-related mol­ecules into supra­molecular dimers.

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The mol­ecule of the title compound, C26H24N4O7S, adopts a trans conformation about the central N—N bond, presumably to minimize steric between the substituents on these two atoms. An intra­molecular N—H...O hydrogen bond occurs. The phenyl ring is disordered over two sets of sites, with an occupancy ratio of 0.624 (8):0.376 (8). The azolidine ring is essentially planar [maximum deviation = 0.008 (5) Å] and makes a dihedral angle of 4.3 (2)° with the benzene ring and dihedral angles of 74.1 (3) and 69.1 (5)°, respectively, with the mean planes of the major and minor components of the disordered phenyl ring. The packing in the crystal is aided by the formation of several weak C—H...O and C—H...N inter­actions.
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