9-(2-Chloro­benzyl­idene)anthracen-10(9H)-one

In the title compound, C₂₁H₁₃ClO, the central anthracene system is distorted towards a boat conformation and the outer rings are not coplanar with the central ring [dihedral angles = 7.79 (1) and 11.90 (1)°]. The crystal structure features inversion dimers with graph-set motif R₂²(18) formed by C—H...O inter­actions.