Used primarily in research settings as a potent and selective antagonist for dopamine D4 receptors. It serves as a valuable tool compound in neuroscience studies aimed at understanding dopaminergic pathways and their role in psychiatric disorders such as schizophrenia, ADHD, and addiction. Due to its high selectivity, it helps differentiate D4 receptor-mediated effects from other dopamine receptor subtypes, aiding in the development and validation of novel therapeutic agents. It is also employed in radiolabeled form for receptor binding assays and autoradiography to map D4 receptor distribution in brain tissues.