Boc-NH-PEG1-CH2COOH（Cat No.:M101446）is a short polyethylene glycol derivative consisting of a single ethylene glycol unit with a Boc-protected amine on one end and a carboxylic acid attached via a methylene (CH2) spacer on the other. The Boc group provides temporary protection for controlled deprotection, enabling selective amine conjugation, while the carboxyl group allows coupling with diverse biomolecules or polymers. This compact PEG linker improves solubility, flexibility, and biocompatibility. Widely applied in peptide synthesis, drug design, and bioconjugation, it facilitates the development of multifunctional molecular architectures and advanced biomedical materials.