Used as an efficient coupling agent in peptide synthesis, facilitating the formation of amide bonds by activating carboxylic acid groups. It is particularly valued in the preparation of complex peptides and proteins due to its high reactivity and minimal racemization. Commonly employed in solid-phase peptide synthesis and bioconjugation processes, it enables the linkage of peptides to carriers, labels, or surfaces under mild conditions. Also utilized in pharmaceutical development for synthesizing peptide-based drugs and in research settings for modifying biomolecules.