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In the title compound, C11H8Cl2N2OS, the mean plane of the dichloro­phenyl ring is twisted by 79.7 (7)° from that of the thia­zole ring. In the crystal, molecules are linked via pairs of N—H...N hydrogen bonds, forming inversion dimers which stack along the a-axis direction.

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The mol­ecule of the title compound, C12H14N4O, is roughly planar, with a dihedral angle of 8.0 (8)° between the benzene and pyrazole rings, and an intra­molecular N—H...O hydrogen bond forms an S(6) ring motif. In the crystal, mol­ecules are linked into an inversion dimer by a pair of N—H...O hydrogen bonds, which form an R22(8) ring motif.
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