L-Threonine methyl ester hydrochloride is widely used in the synthesis of peptides and proteins, serving as a crucial building block in organic chemistry. It is particularly valuable in the preparation of modified amino acids and peptide derivatives, enabling researchers to study protein structure and function. This compound is also employed in the development of pharmaceuticals, where it acts as an intermediate in the production of drugs targeting various diseases. Additionally, it finds application in biochemical research for investigating enzyme mechanisms and metabolic pathways. Its stability and reactivity make it a preferred choice for laboratory experiments and industrial processes.