This compound, tert-Butyl ((17-amino-3,6,9,12,15-pentaoxaheptadecyl)oxy)carbamate, is a specialized bifunctional linker featuring a terminal primary amine (NH₂) connected via a pentaethylene glycol (PEG₅) chain to a Boc-protected hydroxylamine (Boc-NH-O-). It is primarily employed in peptide and protein synthesis, bioconjugation, and drug delivery systems. The free amino group enables covalent attachment to biomolecules such as peptides or proteins, while the Boc group can be orthogonally deprotected under acidic conditions to reveal the reactive hydroxylamine (NH₂-O-), which forms stable oxime bonds with aldehydes or ketones. This makes it valuable for creating targeted conjugates, improving solubility, and enhancing biocompatibility in aqueous environments due to the hydrophilic PEG chain.