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In the crystal structure of the title salt, C10H16N+·ClO4−, the 4-butylanilinium cation is mirror symmetric, the butyl C atoms and anilinium N atom and 1,4-position C atoms of the benzene ring being located on the mirror plane; the perchlorate anion is also mirror symmetric, with two O atoms and one Cl atom lying on the mirror plane. Trifurcated N—H...O hydrogen bonding is observed between the cation and anion in the crystal structure.