Abstract
In the title pyrimidine-2,4-dione derivative, C14H16N2O2S, the dihedral angle between the six-membered rings is 77.81 (10)degrees. The molecule is twisted about the Cp-S (p = pyrimidine) bond, with a C-S-C-N torsion angle of - 59.01 (17)degrees. An intramolecular C-H center dot center dot center dot S hydrogen bond generates an S(5) ring motif. In the crystal, bifurcated acceptor N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds generate inversion- related dimers incorporating R-2(1) (9) and R-2(2) (8) loops. These dimers are connected into a chain extending along the a-axis direction by a second pair of inversion- related N-H center dot center dot center dot O hydrogen bonds, forming another R-2(2) (8) loop. The crystal structure is further stabilized by weak intermolecular C-H center dot center dot center dot pi interactions, generating a three- dimensional network.