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The title compound C20H20O2, has the exocyclic C=C double bond in an E configuration. The two benzene rings form a dihedral angle of 72.92 (6)°.

The title compound, C15H10ClNO2, crystallizes with two molecules (AandB) in the asymmetric unit, which have almost identical conformations (r.m.s. overlay fit = 0.057 Å). In moleculeA, the dihedral angle between the indole ring system (r.m.s. deviation = 0.025 Å) and the phenyl group is 71.39 (8)°. Equivalent data for moleculeBare 0.023 Å and 71.43 (9)°. In the crystal, theAandBmolecules are linked by a C—H...O hydrogen bond and aromatic π–π stacking is also observed [shortest centroid–centroid separation = 3.5810 (11) Å].