title: 3-(5-Chloro-naphthalene-1-sulfonamido)-2-(2-hy-droxy-eth-yl)-4,5,6,7-tetra-hydro-2H-pyrazolo-[4,3-c]pyridin-5-ium chloride.
abstract: In the cation of the title compound, C(18)H(20)ClN(4)O(3)S(+)·Cl(-), the tetra-hydro-pyridinium ring assumes a half-chair conformation. The dihedral angle between the pyrazole ring and the naphthalene ring system is 75.19 (6)°. In the crystal, ions are linked into a three-dimensional network by N-H⋯O, N-H⋯Cl and O-H⋯Cl hydrogen bonds and weak π-π stacking inter-actions with centroid-centroid distances of 3.608 (2) Å.
authors.affiliation: Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, People's Republic of China.
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Bai
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Liu
authors.forename: Yu-Cheng
authors.initials: YC
authors.lastname: Wang
authors.forename: Ju-Xian
authors.initials: JX
authors.lastname: Wang