Used in bioconjugation to link biomolecules such as peptides, proteins, or antibodies through thiol groups, forming stable PEGylated complexes. Enhances solubility, stability, and circulation time of conjugated therapeutics. Commonly applied in drug delivery systems, tissue engineering scaffolds, and hydrogel formation due to its multi-arm structure enabling crosslinking. Supports controlled release formulations and reduces immunogenicity of attached drugs. Widely used in pharmaceutical research and development of biocompatible materials.