Alkyne-PEG*-Acid is a polyethylene glycol-containing reagent with a
terminal carboxylic acid (COOH) that can be reacted with primary
amine groups in the presence of activators (e.g. EDC, or DCC)
forming a stable amide bond. The terminal alkyne group reacts with
azides by a mechanism known as the Cu-catalyzed click reaction
enabling efficient and specific conjugation of derivatized
molecules in biological samples.