Fmoc-Gln(Trt)-OH is widely used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a protected form of glutamine, where the Fmoc (fluorenylmethyloxycarbonyl) group protects the amino group, and the Trt (trityl) group protects the side chain. This protection ensures selective reactions during peptide chain assembly, preventing unwanted side reactions. It is commonly employed in the production of complex peptides and proteins for research, pharmaceuticals, and biotechnology applications. Its stability and compatibility with SPPS protocols make it a valuable building block for synthesizing peptides with high purity and specificity.