Used in research as a potent and selective antagonist for dopamine D4 receptors, making it a valuable tool compound in neuroscience studies focused on psychiatric disorders such as schizophrenia, attention deficit hyperactivity disorder (ADHD), and addiction. Its high selectivity allows scientists to isolate D4 receptor activity to better understand its role in behavior and cognition. Also employed in radiolabeled form for receptor binding assays and neuroimaging studies. Not used clinically but supports drug development targeting central nervous system pathways.