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In the title mol­ecule, C21H15NO, the two ethyn­yl-bridged six-membered rings are almost coplanar, making a dihedral angle of 3.3 (2)°. The dihedral angle between the two terminal phen­yl rings is 62.9 (2)°. The crystal packing is stabilized by weak inter­molecular N—H...O hydrogen bonds.
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