Methyltetrazine-PEG35-Iodoacetamido represents a special heterobifunctional PEG linker with methyltetrazine, which enables fast click reactions with TCO (trans-cycloctene), and iodoacetamide group, which is an alkylating agent that can be used to bind covalently with the thiol group. The lengthy PEG arm elevates the hydrophilicity of the molecule.
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