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In the title mol­ecule, C9H6Cl2N2S, the mean planes of the benzene and thia­zole rings make a dihedral angle of 54.18 (8)°. In the crystal, mol­ecules are joined into dimers with an R22(8) ring motif by pairs of N—H...N hydrogen bonds. These dimers are linked by C—H...Cl inter­actions into layers parallel to (011). The thia­zole rings form columns along the c-axis direction, with a centroid–centroid separation of 3.8581 (9) Å, indicating π–π inter­actions. An intra­molecular C—H...S contact also occurs.

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In the title compound, C15H14BrNO, the dihedral angle between the aromatic rings is 4.10 (11)° and the mol­ecule is close to planar (r.m.s. deviation for the non-H atoms = 0.053 Å). An intra­molecular O—H...N hydrogen bond closes an S(6) ring. In the crystal, very weak C—H...π inter­actions are observed.
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