Tos-PEG5-Tos CAS:37860-51-8 is a bifunctional PEG derivative with tosyl (tosylate) groups at both ends. The hydrophilic nature of the PEG backbone increases solubility, while the tosyl groups act as efficient leaving groups in nucleophilic substitution reactions.
Polyethylene Glycol PEG Linkers > Tosylate PEG > Tos-PEG-Tos
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