Used in research as a potent and selective antagonist for dopamine D4 receptors, making it valuable in studying neurological pathways related to schizophrenia, attention deficit disorders, and addiction. Its ability to cross the blood-brain barrier enhances its utility in central nervous system studies. Also employed in developing radiolabeled versions for receptor binding assays and neuroimaging. Not used clinically but serves as a key tool compound in psychopharmacology and drug discovery.