The title compound, C(26)H(18), consists of a benzene ring with meta-substituted 1-naphthalene substituents, which are essentially planar (r.m.s. deviation = 0.039 and 0.027 Å). The conformation is mixed syn/anti, with equivalent torsion angles about the benzene-naphthalene bonds of 121.46 (11) and 51.58 (14)°.

In the title compound, C(15)H(11)NS, the dihedral angle between the thio-phene and 1-naphthyl rings is 31.42 (11)°. The mol-ecule adopts a trans configuration about the central C=N bond. In the crystal, the mol-ecules are connected via weak C-H⋯π inter-actions.

A series of 3-substituted-2-thioxoquinazolin-4(3H)-one derivatives have been synthesized and their structures have been elucidated on the basis of IR, (1)H-NMR, elemental analysis and mass spectroscopic studies. Anti-inflammatory and analgesic activity of the synthesized compounds was evaluated by Carrageenan induced rat paw edema method and Eddy's hot plate method respectively. Among the synth...