A closely related antipsychotic, amperozide, has an additional nitrogen atom in the heterocyclic ring and is classified as a diphenylbutylpiperazine.[3]
^Qar J, Galizzi JP, Fosset M, Lazdunski M (September 1987). "Receptors for diphenylbutylpiperidine neuroleptics in brain, cardiac, and smooth muscle membranes. Relationship with receptors for 1,4-dihydropyridines and phenylalkylamines and with Ca2+ channel blockade". European Journal of Pharmacology. 141 (2): 261–8. doi:10.1016/0014-2999(87)90271-8. PMID2445589.