Tetrazine-PEG-NHS ester

Tetrazine-PEG-NHS ester is a reagent used to link a hydrophilic polymer (such as polyethylene glycol) to a reactive group (such as an amine group) in order to create a stable, water-soluble complex. It is often used in bioconjugation, where it can be used to attach proteins, nucleic acids, and other molecules to surfaces or other molecules.