Glycine benzyl ester hydrochloride is widely used in peptide synthesis as a protecting group for the carboxyl function of glycine. It helps in preventing unwanted side reactions during the formation of peptide bonds. The benzyl ester group can be easily removed by hydrogenolysis, making it a convenient choice for temporary protection in organic synthesis. Additionally, it serves as an intermediate in the preparation of various pharmaceuticals and bioactive compounds, particularly in the development of peptide-based drugs. Its application also extends to research settings where controlled release of glycine is required for biochemical studies.