m-PEG-Glu-Glutamic acid, MW 20,000 is a large PEG linker with a methoxy cap and a bis(glutamic acid) dipeptide. The methoxy cap is relatively inert, allowing any reactivity to occur at the glutamic acid residues. The glutamic acid dipeptide features three carboxylic acids which can be used to build larger conjugates via amide or ester bonds.
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