Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS). It serves as a building block for incorporating unnatural amino acids into peptides, enhancing their structural diversity and functionality. Its Fmoc group allows for selective deprotection during synthesis, ensuring precise control over the peptide assembly process. This chemical is valuable in developing peptide-based drugs, bioactive peptides, and research tools for studying protein interactions and functions. Its unique thienyl side chain can influence peptide conformation and binding properties, making it useful in designing peptides with specific biological activities or improved stability.