title: Ethyl 5-amino-1-[(4-methyl-phen-yl)sulfon-yl]-1H-pyrazole-4-carboxyl-ate.
abstract: In the title mol-ecule, C13H15N3O4S, the benzene and pyrazole rings are inclined to each other at 77.48 (3)°. Two amino H atoms are involved in bifurcated hydrogen bonds, viz. intra-molecular N-H⋯O and inter-molecular N-H⋯O(N). The inter-molecular hydrogen bonds link the mol-ecules related by translation in [100] into chains. A short distance of 3.680 (3) Å between the centroids of benzene and pyrazole rings from neighbouring mol-ecules shows the presence of π-π inter-actions, which link the hydrogen-bonded chains into layers parallel to the ab plane.
authors.affiliation: Chemistry Department, Faculty of Science, Ain Shams University, Abbassia 11566, Cairo, Egypt.
authors.forename: Abdel-Sattar S Hamad
authors.initials: AS
authors.lastname: Elgazwy
authors.affiliation: Faculty of Education, Ain Shams University, Abbassia, Cairo, Egypt.
authors.forename: Ibrahim F
authors.initials: IF
authors.lastname: Nassar
authors.affiliation: Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany.
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones