endo-BCN-PEG2-NHS ester is aclick chemistry crosslinker containing an NHS ester group. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The BCN group is reactive with azide-tagged biomolecules. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.