ASP 7663 is primarily utilized in pharmaceutical research and development, particularly in the study of neurological disorders. It acts as a potent and selective antagonist for specific receptors in the brain, making it valuable for investigating conditions such as Parkinson's disease, anxiety, and depression. Its ability to modulate neurotransmitter activity helps researchers understand the underlying mechanisms of these disorders and explore potential therapeutic interventions. Additionally, ASP 7663 is used in preclinical studies to assess its efficacy and safety profile, contributing to the development of novel treatments for neurological and psychiatric conditions.