Amino-PEG-t-butyl ester, MW 5,000 is a heterofunctional polyPEG which can be reacted with an NHS ester or with carboxylic acid in the presence of HATU or EDC to form a stable amide bond. Hydrolysis of tert butyl ester can be done under acidic or basic condition to produce a free carboxyl. Reagent grade, for research purpose.
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