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In the title compound, C 13 H 15 N 3 O 5 S, the two rings face each other in a ‘V′ form at the S atom, with one N—H⋯O=S and one C—H⋯O=S contact from the pyrazolyl substituents to the sulfonyl group. Two classical hydrogen bonds from the amine group, one of the form N—H⋯O=S and one N—H⋯O=C oxo , link the mol­ecules to form layers parallel to the  bc  plane.

Crystal structure of ethyl 2-(5-amino-1-benzenesulfonyl-3-oxo-2,3-dihydro-1H-pyrazol-2-yl)acetate