Key indicators: single-crystal X-ray study; T = 113 K; mean (C-C) = 0.004 Å; R factor = 0.029; wR factor = 0.054; data-to-parameter ratio = 13.3.In the title molecule, C 16 H 16 BrN 5 O 3 S, the 1,3,4-thiadiazole ring is situated under the benzene ring, forming a dihedral angle of 86.6 (2) , and with an SÁ Á ÁCg (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-HÁ Á Á interaction..
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