In the title mol-ecule, C13H13ClN2OS, the heterocyclic ring adopts a flattened boat conformation with the plane through the four coplanar atoms making a dihedral angle of 85.6 (1)° with the benzene ring, which adopts an axial orientation. The thionyl, acetyl and methyl groups all have equatorial orientations. Inter-molecular N - H⋯O, N - H⋯S and C - H⋯S hydrogen bonds are found in the crystal structure. A weak C - H⋯π inter-action involving the benzene ring also occurs.
Anuradha, N., Thiruvalluvar, A., Pandiarajan, K., Chitra, S., & Butcher, R. J. (2009). 5-Acetyl-4-(2-chlorophenyl)-6-methyl-3,4-dihydropyrimidine-2(1H)-thione. Acta Crystallographica Section E: Structure Reports Online, 65(12). https://doi.org/10.1107/S1600536809047187