title: 1-[5-(2-Chloro-phen-yl)-5-hy-droxy-3-methyl-4,5-dihydro-1H-pyrazol-1-yl]-ethanone.
abstract: The title compound, C(12)H(13)ClN(2)O(2), crystallizes with two independent but very similar mol-ecules (A and B) in the asymmetric unit. The pyrazole ring in each mol-ecule has an envelope conformation. The dihedral angle between the pyrazole ring mean plane and the benzene ring is 86.07 (14)° in A and 85.99 (14)° in B. In the crystal, the A and B mol-ecules are linked via a pair of O-H⋯O hydrogen bonds, forming dimers. These dimers are further linked via C-H⋯O inter-actions to form -A-B-A-B- chains propagating along the c-axis direction.
authors.affiliation: School of Chemistry and Environmental Science, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, Henan 453007,  People's Republic of China.
authors.forename: Sheng-Hai
authors.initials: SH
authors.lastname: Guo
authors.forename: Ji-Liang
authors.initials: JL
authors.lastname: Wang
authors.forename: Dong-Qiang
authors.initials: DQ
authors.lastname: Guo
authors.forename: Xin-Ying
authors.initials: XY
authors.lastname: Zhang