EHNA hydrochloride is primarily used in research settings as a selective inhibitor of adenosine deaminase, an enzyme involved in purine metabolism. By inhibiting this enzyme, it helps modulate adenosine levels in cellular systems, making it a valuable tool in studies related to signal transduction, cell proliferation, and immune response. It has also been employed in investigations of phosphodiesterase 2 (PDE2), where it acts as a potent inhibitor, allowing researchers to explore cyclic nucleotide signaling pathways such as those involving cAMP and cGMP. Due to its ability to influence intracellular signaling, EHNA hydrochloride is used in cardiovascular and neurological research to examine the role of adenosine in protecting tissues from ischemic damage. Additionally, it has been utilized in hematological studies to enhance the sensitivity of certain leukemia cell lines to nucleoside analogs, supporting the development of targeted cancer therapies.