1-(3-Chloro-phen-yl)-4,4,6-trimethyl-3,4-dihydro-pyrimidine-2(1H)-thione.

In the title compound, C(13)H(15)ClN(2)S, the dihydro-pyrimidine ring is essentially planar, with a maximum deviation from the least-squares plane of 0.122†(3)†à for the unsubstitued olefinic C atom. The dihedral angle between the dihydro-pyrimidine and benzene rings is 86.62†(13)°. The crystal structure is stabilized by inter-molecular N-H⋯S hydrogen bonds, which form centrosymmetric dimers arranged along the c axis.