m-PEG4-CH2COOH

• CAT Number: M087276
• CAS Number: 16024-66-1
• Molecular Formula: C11H22O7
• Molecular Weight: 266.29
• Purity: ≥95%
• Synonyms: 2-[2-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]ethoxy]acetic acid
• InChI: InChI=1S/C11H22O7/c1-14-2-3-15-4-5-16-6-7-17-8-9-18-10-11(12)13/h2-10H2,1H3,(H,12,13)
• InChIKey: DDTZAHIJJCRGFT-UHFFFAOYSA-N
• SMILES: COCCOCCOCCOCCOCC(=O)O

m-PEG4-CH2COOH(CAT: M087276) is a monofunctional polyethylene glycol (PEG) derivative consisting of a four-unit PEG spacer terminated with a carboxylic acid group. The terminal acid enables straightforward coupling to primary amines through amide bond formation, making it an efficient linker for bioconjugation and surface modification. The PEG4 chain provides hydrophilicity, flexibility, and reduced steric hindrance, enhancing solubility and biocompatibility of conjugates. m-PEG4-CH2COOH is widely used in drug delivery, PEGylation, biomaterials engineering, and nanotechnology, where controlled linker length and reliable carboxyl reactivity are required. Its design makes it a versatile building block for constructing stable, functionalized biomolecules and polymers.