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In the title compound, C 40 H 44 O 3 , the fluorene ring system is essentially planar, with a maximum deviation of 0.075 (3) Å, and forms dihedral angles of 70.62 (8) and 70.31 (8)° with the mean planes of the central benzene ring and the meth­oxy­phenyl ring, respectively. Both the hexyl side chains have different conformations,  i.e . an  anti – gauche – anti – gauche  conformation with C—C—C—C torsion angles of −169.3 (2), 74.2 (4), −178.0 (3) and −76.0 (6)° for one hexyl side chain and an  anti – anti – anti – gauche  conformation with C—C—C—C torsion angles of −177.9 (2), −176.5 (3), 171.7 (4) and 80.4 (9)° for the other. Four C atoms in one and two C atoms in the other hexyl side chains are each disordered over two sets of sites, with occupancy factors of 0.761 (3):0.239 (3) and 0.660 (6):0.340 (6). In the crystal, mol­ecules are  via  pairs of C—H⋯O hydrogen bonds, forming inversion dimers and resulting in  R   2   2 (28) graph-set motifs.

{2-[(9,9-Dihexylfluoren-2-yl)carbonyl]phenyl}(4-methoxyphenyl)methanone