4-ArmPEG-TosylateisamultiarmPEGderivativewithtosylortoluenesulfonylgroupsateachterminalofthefourarmsconnectedtoonepentaerythritolcore.Tosylateisaverygoodleavinggroupforneucleophilicsubstitutionreaction.4-ArmPEG-Mesylateormesylmaybeofferedthroughcustomsynthesis.
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