In the title compound, C21H23NO2, the hexyl group adopts an extended conformation, the six C atoms are nearly coplanar [maximum deviation = 0.082 (3) Å] and their mean plane is approximately perpendicular to the carbazole ring system, with a dihedral angle of 78.91 (15)°. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, forming inversion dimers; π-π stacking between carbazole ring systems of adjacent dimers further links the dimers into supra-molecular chains propagating along the b-axis direction [centroid-to-centroid distances = 3.868 (2) and 3.929 (2) Å].
Keywords: crystal structure.