Mal-PEG4-acid (CAS: 518044-41-2) is a heterobifunctional PEG linker with a maleimide group and a terminal carboxylic acid. It enables targeted thiol conjugation, enhancing solubility and flexibility, and is ideal for ADC synthesis, protein labeling, and bioconjugation.
Polyethylene Glycol PEG Linkers > Maleimide PEG > Mal-PEG-acid
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