Acta Cryst. (2011). E67, o2670 [ doi:10.1107/S1600536811037020 ]
Abstract: In the title compound, C10H9ClN4O, the pyrazole ring [maximum deviation = 0.014 (2) Å] forms a dihedral angle of 7.06 (14)° with the chlorobenzene ring. The molecular conformation is stabilized by an intramolecular N-HO hydrogen bond, which generates an S(6) ring motif. In the crystal, inversion dimers linked by pairs of C-HO hydrogen bonds generate R22(16) ring motifs. The dimers are further connected by N-HN hydrogen bonds, thereby forming layers lying parallel to the bc plane.
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