Acid-PEG3-mono-methyl ester serves a PEG linker including a methyl ester which can be hydrolyzed under strong basic conditions and a carboxylic terminal that can react with primary amine groups in the presence of activators (e.g. EDC or HATU). Solubility in aqueous media is enhanced via the PEG3 chain. Reagent grade, for research purpose.
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