1-Benzyl-5-chloroindoline-2,3-dione

The title compound, C15H10ClNO2, crystallizes with two molecules (A and B) in the asymmetric unit, which have almost identical conformations (r.m.s. overlay fit = 0.057 Å). In molecule A, 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 molecule B are 0.023 Å and 71.43 (9)°. In the crystal, the A and B molecules 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]