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In the title compound, C 39 H 26 O, the cyclo­penta­[ a ]acenaphthyl­ene skeleton displays the expected distortions, with formal  sp2  bond angles as high as C—C—C = 142.50 (10)°. The OH group forms inter­molecular hydrogen bonds  via x -axis translation to the centroid ( Cg ) of the pendant phenyl ring of the biphenyl system, with H⋯ Cg  = 2.41 Å and O—H⋯ Cg  = 153°.

8-(Biphenyl-2-yl)-7,9-diphenyl-8H-cyclopenta[a]acenaphthylen-8-ol