N-DBCO-N-bis(PEG2-amide-PEG4-Acid) is a precursor of antibody drug conjugate. It contains a DBCO group and two protease-sensitive Val-Cit dipeptide with carboxylic acid groups. DBCO group is a highly reactive cycloalkyne which is commonly used for copper-free Click Chemistry reactions. The acid group can derivatize amine-containing molecules in the presence of activators such as EDC or HATU. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.