TCO-PEG12-NHS Ester is a water soluble PEG linker containing a TCO moiety and a NHS ester. PEG12 linear arm increases water-solubility and decreases steric hindrance during ligation. This reagent can be used to label antibodies, proteins and other primary amine-containing macromolecules with TCO moiety. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.