Tos-PEG9-t-butyl ester(CAS: 1345337-28-1) linker bears a t-butyl ester and a tosyl group. The PEG spacer increases the aqueous solubility of the resulting compound.
Polyethylene Glycol PEG Linkers > Tosylate PEG > Tos-PEG-t-butyl ester
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