cPEG-PEG-NH2

Primary amine-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (cPEG-PEG-NH2) is a cyclic-topology derivative bearing a pendant PEG arm. The specified conjugation or functional groups are located on the pendant segment. Discrete chain lengths with different degrees of polymerization are available. The primary amine can react with activated carboxyl groups or NHS esters to form amide bonds and introduce carboxyl-containing functional moieties. The cyclic scaffold retains its topological features, while the pendant arm provides conjugation and presentation functions. This allows the effects of ring structure and pendant-chain length on molecular conjugation to be distinguished.

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