(2-pyridyldithio)-PEG4-NHS ester is a heterobifunctional PEG linker with a 2-pyridyldisulfide for thiol conjugation and an NHS ester for amine coupling. The PEG4 spacer specifically enhances solubility and flexibility for efficient, cleavable bioconjugation.
Polyethylene Glycol PEG Linkers > Thiol PEG > (2-pyridyldithio)-PEG-NHS ester
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