endo-BCN-PEG12-NHS ester is a aqueous soluble PEG linker containing an NHS ester group and a BCN group. It can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The BCN group enable copper free click chemistry with azide-attached molecules. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.