CGS-15943 is primarily used in scientific research as a potent adenosine receptor antagonist. It is widely applied in pharmacological studies to investigate the role of adenosine receptors in various physiological processes, including cardiovascular function, inflammation, and neurotransmission. Due to its ability to block adenosine activity, it helps researchers understand signaling pathways involved in conditions like ischemia, asthma, and neurological disorders. It is also used in experimental models to assess immune modulation and bronchoconstriction, making it a valuable tool in developing therapies targeting purinergic signaling.