Experimental

R factor = 0.030; wR factor = 0.071; data-to-parameter ratio = 13.3. In the crystal structure of the title compound, C11H15N3O2S, the C—N—N—C and C—N—C—C torsion angles involving the benzene ring and ethyl group are 11.91 (15) and 99.4 (2), respectively. An intramolecular N—H N hydrogen bond is observed. In the crystal, molecules are linked via N—H O and N—H S hydrogen bonds into a three-dimensional hydrogen bonded network. Finally, the molecules show a herringbone arrangement when viewed along the a axis. Related literature For the synthesis and biological applications of thio-semicarbazone derivatives, see: Lovejoy & Richardson (2008). For one of the first reports on the synthesis of thio-semicarbazone derivatives, see: Freund & Schander (1902)