organic compounds
Open access
In the title pyrimidine-2,4-dione derivative, C14H16N2O2S, the dihedral angle between the six-membered rings is 77.81 (10)°. The molecule is twisted about the Cp—S (p = pyrimidine) bond, with a C—S—C—N torsion angle of −59.01 (17)°. An intramolecular C—HS hydrogen bond generates an S(5) ring motif. In the crystal, bifurcated acceptor N—HO and C—HO hydrogen bonds generate inversion-related dimers incorporating R21(9) and R22(8) loops. These dimers are connected into a chain extending along the a-axis direction by a second pair of inversion-related N—HO hydrogen bonds, forming another R22(8) loop. The crystal structure is further stabilized by weak intermolecular C—Hπ interactions, generating a three-dimensional network.