TCS 359 is primarily used in scientific research to study the mechanisms of serotonin receptors, particularly the 5-HT2A receptor, which is involved in the nervous system and various behaviors in the body. These studies aid in developing drugs for treating psychiatric disorders, such as depression, anxiety, and schizophrenia. Additionally, TCS 359 is employed in pharmacological experiments to evaluate the efficacy and safety of new compounds before human use.