This chemical is primarily utilized in the field of peptide synthesis, where it serves as a crucial building block for the incorporation of phosphoserine residues into peptides. Its Fmoc-protected amino acid structure allows for selective deprotection during solid-phase peptide synthesis, enabling the precise construction of phosphopeptides. These phosphopeptides are essential tools in biochemical research, particularly in studying protein phosphorylation, signal transduction pathways, and enzyme-substrate interactions. Additionally, the compound is employed in the development of peptide-based drugs and diagnostics, where phosphorylation plays a critical role in modulating biological activity. Its application extends to the preparation of affinity ligands for purifying phosphorylated proteins and antibodies, aiding in proteomics and immunology studies.