Bis-PEG4-acid (CAS: 31127-85-2) is a bifunctional PEG linker with two terminal carboxylic acids, enabling stable amide bond formation with amines using coupling reagents. It supports controlled sequential conjugation and enhances solubility, ideal for bioconjugation and ADC synthesis.
Polyethylene Glycol PEG Linkers > Bis-PEG-acid > Bis-PEG-acid
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