HOOC-PEG-SH (MW 20000) [HOOC-PEG-Thiol (MW 20000)] is a reactive thiol PEG derivative featuring a terminal carboxyl group. The carboxyl group can react with amines or hydroxyl groups to form either stable amide bonds or unstable ester bonds. The PEG linkage between the thiol and carboxyl groups offers excellent water solubility, flexible joint distance, and enhanced stability.
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