5-Chloro-3-ethylsulfiny1-7-methy1-2-(4-methylphenyI)-1-benzofuran

In the title compound, C18H17ClO2S, the dihedral angle between the mean planes of the benzofuran ring system and the methylphenyl ring is 14.50 (4)degrees. The centroid-centroid distances between the benzene and the methylphenyl rings are 3.827 (2) and 3.741 (2) angstrom, while the centroid-centroid distance between the furan and methylphenyl rings is 3.843 (2) angstrom. These distances indicate pi-pi interactions; on the other hand, the interplanar angles between the benzene and methylphenyl rings, and between the furan and methylphenyl rings are 13.89 (4) and 15.53 (4)degrees, respectively. In the crystal, the molecules stack along the a-axis direction.