This chemical is primarily used in peptide synthesis as a protected form of tyrosine. The tosyl (Tos) group acts as a protective group for the hydroxyl side chain of tyrosine, preventing unwanted reactions during the peptide assembly process. It is particularly useful in solid-phase peptide synthesis (SPPS) and solution-phase synthesis, where selective protection and deprotection are crucial for building complex peptide structures. Additionally, it finds application in the development of pharmaceuticals and bioactive peptides, where tyrosine plays a significant role in biological activity. The compound is also employed in research settings for studying peptide interactions and modifications.