Ethyl 5-amino-1-[(4-methyl-phen-yl)sulfon-yl]-1H-pyrazole-4-carboxyl-ate.

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)†à 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.