A heterobifunctional PEG linker with an endo-BCN specifically for copper-free click chemistry and a t-Boc–protected amine for orthogonal conjugation. The PEG3 spacer especially improves solubility and flexibility.
Polyethylene Glycol PEG Linkers > BCN-PEG > endo-BCN-PEG-Boc-Amine
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