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The title disubstituted thio-urea derivative, C 10 H 14 N 4 S, features an almost planar imine ( E configuration, C 3 N) core flanked by thio-urea (CN 2 S) and methyl-pyridyl (C 5 N) residues (each plane has a r.m.s. deviation of the respective fitted atoms of 0.0066 Å). The dihedral angles between the core and the thio-urea and pyridyl residues are 20.25 (8) and 7.60 (9)°, respectively, indicating twists in the mol-ecule; the dihedral angle between the outer planes is 13.62 (7)°. There is an anti -disposition of the amine-N-H atoms which allows for the formation of an intra-molecular amine-N-H⋯N(imine) hydrogen bond that closes an S (5) loop. In the crystal, amine-N-H⋯N(pyrid-yl) hydrogen bonds lead to zigzag (glide symmetry) supra-molecular chains along the c- axis direction. These are connected into a supra-molecular layer propagating in the bc plane by thio-amide-N-H⋯S(thione) hydrogen bonds via eight-membered thio-amide {⋯HNCS} 2 synthons.

3-Methyl-1-{(E)-[1-(4-methylpyridin-2-yl)ethylidene]amino}thiourea: crystal structure and Hirshfeld surface analysis