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In the title compound, C 23 H 24 NO 4+ ·Br − , the butyl chain is disordered between two conformations; the occupancies refined to 0.735 (7) and 0.265 (7). The dihedral angle between the naphthalene ring system and the phenyl ring is 11.6 (2)°. In the crystal structure, the cations are packed  via  π–π inter­actions into stacks propagating in the [010] direction. Weak inter­molecular C—H⋯O and C—H⋯Br hydrogen bonds contribute further to the crystal packing stability.

9-O-Butylberberrubinium bromide