N-(m-PEG4)-N'-(azide-PEG4)-Cy3

N-(m-PEG4)-N'-(azide-PEG4)-Cy3 is a PEG linker containing cyanine dye with excitation/emmission maximum 555/570 nm as well as an azide group, which enables Click Chemistry. The hydophilic PEG spacer increases solubility in aqueous media.