Used primarily in biochemical and pharmacological research as a selective antagonist for serotonin receptors, particularly the 5-HT3 receptor subtype. Its main application lies in studying the role of serotonin signaling in the central nervous system, including mechanisms related to nausea, vomiting, anxiety, and gastrointestinal motility. Due to its ability to cross the blood-brain barrier, it is valuable in neuroscience for probing receptor function in vivo and in vitro. It also serves as an intermediate in the synthesis of more complex neuroactive compounds and is used in structure-activity relationship (SAR) studies to develop improved receptor ligands.