Used primarily in scientific research to study the kappa-opioid receptor system in the central nervous system. It serves as a selective agonist for kappa-opioid receptors, making it valuable in investigating pain modulation, mood regulation, and substance abuse mechanisms. Researchers use it to explore the effects of kappa receptor activation on behaviors such as analgesia, sedation, and dysphoria. Also utilized in studies examining the role of opioid receptors in addiction and withdrawal, particularly related to drugs of abuse like cocaine and alcohol. Due to its psychoactive effects, it is not used clinically and is restricted to controlled laboratory settings.