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The title compound, C54H48N2O2, lies about an inversion centre. The carbazole ring system makes dihedral angles of 58.43 (7) and 88.96 (7)°, respectively, with the adjacent and central benzene rings. The dihedral angle between the two benzene rings is 52.01 (8)°. In the crystal, mol­ecules are linked by pairs of C—H...O inter­actions, forming a tape along the a axis. The methyl group is disordered over two sets of sites with occupancies of 0.63 (3) and 0.37 (3).

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In the cation of the title salt, C18H23N2+·C24H20B-, the pyridine ring forms a dihedral angle of 14.23 (6)° with the benzene ring. One of the ethyl groups of the cation was refined as disordered over two sets of sites with equal occupancies.
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