DL-Ser-Obzl.HCl is primarily used in peptide synthesis as a protected form of serine. The benzyl (Bzl) group acts as a protective group for the hydroxyl side chain of serine, preventing unwanted reactions during the synthesis process. This compound is particularly useful in solid-phase peptide synthesis (SPPS) and solution-phase synthesis, where selective protection and deprotection of functional groups are critical. It is also employed in the preparation of serine-containing peptides for research in biochemistry and pharmaceuticals, aiding in the study of peptide structure and function. Additionally, it serves as an intermediate in the synthesis of more complex organic molecules, including bioactive compounds and drug candidates.