Boc-NH-PEG7-acid（Cat No.:I015976）is a polyethylene glycol derivative featuring a Boc-protected amine at one end and a terminal carboxylic acid at the other, linked through a seven-unit PEG chain. The PEG7 spacer provides excellent hydrophilicity, flexibility, and reduced steric hindrance, enhancing conjugation efficiency with biomolecules or polymers. The Boc group ensures temporary amine protection, allowing selective deprotection for controlled reactions. This reagent is widely used in peptide chemistry, drug discovery, and bioconjugation, serving as a reliable linker for protein modification, polymer functionalization, and construction of advanced therapeutic or diagnostic systems.