TCO-PEG36-acid is a long chain, monodisperse PEG reagent with a TCO function group. The terminal carboxylic acid can react with primary amine groups in the presence o EDC to form an amide bond. This reagent can react with tetrazine-containing compounds without the catalysis of Cu or elevated temperatures. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.