NHSOOCCH2CH2-PEG-CH2CH2COONHS Ester

Alpha,omega-bis(carboxyethyl N-hydroxysuccinimide ester) poly(ethylene glycol) (NHSCOCH2CH2-PEG-CH2CH2CONHS) is a homobifunctional precision PEG derivative with a defined chain length. Both ends bear carboxyethyl NHS ester groups. Discrete chain lengths with different degrees of polymerization are available. The carboxyethyl NHS ester can couple to primary amines while retaining an extended local spacer for designing different conjugation distances. Identical reactive sites at both ends support molecular bridging or derivatization on both sides. The conjugation scheme can be designed around the number of target sites.

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