Used in peptide synthesis as a protected amino acid building block, particularly in the development of bioactive peptides and pharmaceutical intermediates. The Boc (tert-butoxycarbonyl) group provides amine protection during solid-phase or solution-phase synthesis, allowing for controlled coupling reactions. The 5-bromothienyl side chain offers a site for further functionalization via cross-coupling reactions, such as Suzuki or Stille couplings, enabling the introduction of aromatic or heteroaromatic systems into peptide structures. This makes it valuable in medicinal chemistry for designing peptide-based drugs with modified stability, binding affinity, or receptor selectivity. Commonly applied in research settings for synthesizing constrained or modified peptides for structure-activity relationship (SAR) studies.