O-Benzyl-L-serine Methyl Ester Hydrochloride is primarily used in the synthesis of peptides and other organic compounds. It serves as a protected form of serine, where the benzyl group protects the hydroxyl side chain, allowing selective reactions at other sites of the molecule. This compound is particularly valuable in peptide chemistry, where it is used to build peptide chains with specific sequences and properties. It is also employed in the preparation of modified amino acids, which are crucial for developing pharmaceuticals, including drugs that target specific biological pathways or enzymes. Additionally, it finds application in research settings for studying protein structure and function, as well as in the development of novel biomaterials. Its role as an intermediate in organic synthesis makes it a versatile tool in medicinal chemistry and biochemistry.