N-Methyl-2-(1,2,3,4-tetra-hydro-naph-thalen-1-yl-idene)hydrazinecarbo-thio-amide.

There are two independent mol-ecules in the asymmetric unit of the title compound, C12H15N3S, both of which display disorder of several C atoms in the N-bound ring (occupancy ratios of 0.75:0.25 in the first independent mol-ecule and 0.50:0.50 in the second) with the methyl H atoms also being disordered in the first mol-ecule (occupancy ratio of 0.70:0.30). The planes of the benzene ring and the N-N-C-N fragment make dihedral angles of 12.92 (14)° in the first independent mol-ecule and 7.60 (13)° in the second. In the crystal, mol-ecules are linked by weak N-H⋯S hydrogen bonds into chains along the a-axis direction. The crystal packing ressembles a herringbone arrangement.