(2E)-3-(6-Meth-oxy-naphthalen-2-yl)-1-[4-(methyl-sulfan-yl)phen-yl]prop-2-en-1-one.

The asymmetric unit of the title compound, C(21)H(18)O(2)S, consists of two crystallographically independent mol-ecules (A and B). The mol-ecules exist in a trans conformation with respect to the central C=C bond. The naphthalene ring system makes dihedral angles of 51.62 (12) (mol-ecule A) and 52.69 (12)° (mol-ecule B) with the benzene ring. In mol-ecule A, the prop-2-en-1-one group forms dihedral angles of 22.84 (15) and 29.02 (12)° with the adjacent naphthalene ring system and benzene ring, respectively, whereas the corresponding angles are 30.04 (12) and 23.33 (12)° in mol-ecule B. In the crystal, mol-ecules are linked by inter-molecular C-H⋯O hydrogen bonds into head-to-tail chains along the a axis. The crystal packing also features C-H⋯π inter-actions. The crystal studied was a pseudo-merohedral twin with twin law (100 0-10 00-1) and a refined component ratio of 0.6103 (16):0.3897 (16).