L-Glutamine t-butyl ester hydrochloride is widely used in peptide synthesis as a protective group for the carboxyl function of glutamine. It helps in preventing unwanted side reactions during the formation of peptide bonds, ensuring higher purity and yield of the final peptide product. This compound is particularly valuable in the production of complex peptides and proteins for pharmaceutical research and drug development. Additionally, it is utilized in the synthesis of bioactive peptides, which are essential for studying cellular processes and developing therapeutic agents. Its stability and ease of removal make it a preferred choice in solid-phase peptide synthesis.