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In the title mol­ecule, C12H12ClN3O2, the benzene and pyrazole rings are inclined to each other at a dihedral angle of 83.3 (3)°. In the crystal, mol­ecules are linked into [010] chains via O—H...N hydrogen bonds with the unsubstituted pyrazole N atom acting as the acceptor.

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In the title mol­ecule, C16H16BrN5O3S, the 1,3,4-thia­diazole ring is situated under the benzene ring, forming a dihedral angle of 86.6 (2)°, and with an S...Cg (where Cg is the centroid of the benzene ring) distance of 3.312 (3) Å. The benzene and 1,3,4-thia­diazole rings form dihedral angles of 83.8 (3) and 57.7 (2)°, respectively, with the central pyrazole ring. In the absence of classical hydrogen bonds, the crystal packing is stabilized by a C—H...π inter­action..
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