m-PEG11-CH2COOH CAS:908258-58-2 contains a terminal carboxylic acid. The terminal carboxylic acid readily reacts with primary and secondary amine under EDC, DCC, HATU or other amide coupling conditions to form a stable amide bond.
Polyethylene Glycol PEG Linkers > M-PEG > M-PEG-CH2COOH
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