WAY-640817 is primarily used in neuroscience research as a potent and selective agonist for the 5-HT2C receptor subtype. Its main application lies in studying the role of serotonin signaling in behavioral and physiological processes, particularly those related to mood regulation, appetite control, and reward pathways. Due to its selectivity, it is a valuable tool for investigating the therapeutic potential of 5-HT2C activation in conditions such as obesity, depression, and substance use disorders. It is not used clinically but serves as a critical compound in preclinical studies to validate drug targets and assess pharmacological responses in animal models.