Used as an ester-based coupling agent in organic synthesis, particularly in peptide synthesis where it activates carboxylic acids for amide bond formation. It enhances reaction efficiency by generating active esters that react smoothly with amines, reducing racemization. Commonly employed in solid-phase peptide synthesis and bioconjugation due to its stability and selectivity. Also utilized in the preparation of pharmaceuticals, agrochemicals, and specialty polymers where mild activation of fatty acids is required. Its long aliphatic chain improves solubility in organic solvents, making it suitable for lipophilic systems.