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The asymmetric unit of the title compound, C23H21N3, consists of two symmetry-independent and conformationally different mol­ecules [the comparable dihedral angles between the imidazole ring and the three benzene rings being 38.5 (2)/61.5 (3)/3.37 (17) and 45.8 (2)/36.01 (19)/46.94 (17)°]. In the crystal, inter­molecular imidazole N—H...N hydrogen-bonding inter­actions give a one-dimensional chain extending along [101].

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In the title compound C18H26BrNO2S, the thia­zepine ring adopts a boat conformation. The dihedral angle between the mean planes through the benzene ring and the four C atoms making up the basal plane of the boat is 35.8 (2)°. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R22(8) loops.
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