Amino-PEG4-alcohol is a very popular PEG reagent containing an amino group (NH2) with a hydroxyl group (OH). The amino group is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde) etc. The hydroxyl group enables further derivatization or replacement with other reactive functional groups. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.