4-{2-[(E)-Cyclopentylidene]hydrazin-1-yl}benzenesulfonamide

The title molecule, C11H15N3O2S, features a five-membered ring which is twisted about the middle CH2—CH2 bond. The benzene ring is inclined with respect to the imine residue [C—N—N—C torsion angle = 165.4 (2)°]. Supramolecular layers in the bc plane are formed by hydrogen bonds between the amine H atoms and sulfonamide O and imine N atoms, as well as by a weak hydrazine H-atom intermolecular interaction with the second sulfonamide O atom.