Used as a protected amine-functionalized PEG linker with a terminal bromo group in bioconjugation and pharmaceutical synthesis. The tert-butyl carbamate (Boc) group provides stable amine protection during reactions, allowing selective deprotection under mild acidic conditions. The terminal bromo enables nucleophilic substitution reactions, such as with thiols to form stable thioether linkages for biomolecule attachment. The long hydrophilic PEG chain with 10 ethylene oxide units enhances solubility and flexibility, making it ideal for linking biomolecules such as peptides, antibodies, or drugs in targeted delivery systems. Commonly applied in the development of PEGylated therapeutics, diagnostic probes, and surface functionalization of nanoparticles.