4-{(4Z)-4-[(2Z)-3-(4-Fluoroanilino)-1-hydroxybut-2-en-1-ylidene] -3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl}-benzene-sufonamide

Abstract

In the title compound, C 20H 19FN 4O 4S, the pyrazole and benzene-sulfonamide rings are coplanar [dihedral angle = 5.02 (15)°] but this planarity does not extend over the entire mol-ecule, the dihedral angle between the terminal six-membered rings being 33.24 (14)°. Intra-molecular hy-droxy-hy-droxy O - H⋯O and amine-hy-droxy N - H⋯O hydrogen bonds, as a well as a tight C - H⋯O(carbon-yl) inter-action, lead to a sequence of three fused S(6) rings. Supra-molecular chains along the a axis feature in the crystal packing; these chains are stabilized by amine-sulfonamide N - H⋯O and amine-pyrazole N - H⋯N hydrogen bonds.