NH-bis(PEG4-t-butyl ester) is a bifunctional PEG reagent with two PEG4 arms capped by t-butyl esters. It provides solubility, spacing, and orthogonal protection, making it especially valuable for bioconjugation, probe design, and controlled synthesis.
Polyethylene Glycol PEG Linkers > PEG-X-PEG > PEG-NH-PEG
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