m-PEG16-acid is a PEG linker containing carboxylic acid and methoxy moieties. The carboxylic acid can react with primary amine groups in the presence of activators (e.g. EDC, or HATU) to form a stable amide bond. The hydrophilic PEG linker increases the water solubility of the overall compound allowing for the delivery of the drug. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.