D-Glutamic Acid 1,5-Diethyl Ester Hydrochloride is primarily used in biochemical research and pharmaceutical development. It serves as a key intermediate in the synthesis of peptides and amino acid derivatives, which are crucial for studying protein structures and functions. This compound is also employed in the preparation of chiral compounds, aiding in the development of enantioselective catalysts and drugs. Additionally, it finds applications in neuroscience research, where it is used to investigate neurotransmitter activity and receptor interactions, particularly in studies related to glutamatergic signaling pathways. Its role in these areas helps advance understanding of neurological disorders and potential therapeutic interventions.