Product Description: Cy3-PEG2-endo-BCN is a dye derivative of Cyanine 3 (Cy3) (HY-D0822) containing 2 PEG units. Cy3-PEG2-endo-BCN contains the lyophilic bidentate macrocyclic ligand endo-BCN, which can further synthesize macrocyclic complexes. In click chemistry, endo-BCN can react with molecules containing azide groups to form stable triazoles in the absence of catalysts.