Methyltetrazine-PEG12-t-butyl ester is a heterobifunctional linker with methyltetrazine for IEDDA click chemistry and a t-butyl-protected acid specifically for orthogonal conjugation, connected by a PEG12 spacer.
Polyethylene Glycol PEG Linkers > Tetrazine PEG > Tetrazine-PEG-t-butyl ester
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