Used in peptide synthesis as a protected form of serine, where the benzyl (Bzl) group safeguards the hydroxyl functionality during the reaction process. This protection is crucial to prevent unwanted side reactions and ensure the correct sequence and structure of the peptide. It is particularly valuable in solid-phase peptide synthesis (SPPS) for producing peptides with high purity and specificity. Additionally, it finds application in the development of pharmaceutical compounds, where precise peptide sequences are essential for drug efficacy and stability. The hydrochloride (HCl) form enhances solubility, making it easier to handle in various chemical processes.