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The structure of the title compound, C20H18O2, consists of a dimeric arrangement of benzofuran molecules around an inversion centre, linked via C - H...O hydrogen bonds. There are also C - H...pi ring interactions. All these interactions result in the formation of infinite chains parallel to the [ 100] axis. The cyclobutane ring is puckered, with a dihedral angle of 29.03 (13)degrees between the two three-atom planes.