m-PEG9-CH2COOH

• CAT Number: I016292
• CAS Number: 405518-55-0
• Molecular Formula: C21H42O12
• Molecular Weight: 486.55
• Purity: ≥95%
• Synonyms: 2-[2-[2-[2-[2-[2-[2-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]acetic acid
• InChI: InChI=1S/C21H42O12/c1-24-2-3-25-4-5-26-6-7-27-8-9-28-10-11-29-12-13-30-14-15-31-16-17-32-18-19-33-20-21(22)23/h2-20H2,1H3,(H,22,23)
• InChIKey: XVVLEAQJQOTYFV-UHFFFAOYSA-N
• SMILES: COCCOCCOCCOCCOCCOCCOCCOCCOCCOCC(=O)O

m-PEG9-CH2COOH(CAT: I016292) is a monofunctional polyethylene glycol (PEG) derivative featuring a methoxy group on one end and a carboxymethyl group on the other. The PEG9 spacer, consisting of nine ethylene glycol units, imparts flexibility, hydrophilicity, and excellent solubility in both aqueous and organic systems. The methoxy end provides stability by blocking one terminus, while the terminal carboxylic acid enables conjugation to amines or other nucleophiles via amide or ester bond formation. With its medium-length PEG chain, m-PEG9-CH2COOH is widely used in bioconjugation, drug delivery, polymer modification, and surface functionalization, offering controlled spacing and enhanced biocompatibility.