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 substance abuse. Its ability to cross the blood-brain barrier enhances its utility in in vivo models to investigate dopaminergic pathways. Due to its high selectivity, it helps differentiate D4 receptor-mediated effects from those involving other dopamine receptor subtypes. Commonly employed in binding assays and functional studies to characterize receptor activity and drug interactions.