3-Ethenyl-1-(4-methyl-phenyl-sulfon-yl)-1H-indole.

Two independent but very similar mol-ecules comprise the asymmetric unit of the title compound, C(17)H(15)NO(2)S. The mol-ecules have L-shapes with the dihedral angles between the fused-ring system (r.m.s. deviations = 0.036 and 0.019 Å, respectively) and the benzene ring being almost the same, i.e. 82.98 (12) and 84.46 (13)°, respectively. The terminal ethenyl group is almost coplanar with the ring to which it is connected [C-C-C-C torsion angles = -173.7 (4) and -171.7 (4)°, respectively]. Supra-molecular arrays parallel to (-124) stabilized by C-H⋯O and C-H⋯π inter-actions feature in the crystal packing.