N-(m-PEG4)-N’-(azide-PEG4)-Cy3 is a cyanine dye with excitation/emission maxima at 555/570 nm and a PEG linker with an azide group that enables Click Chemistry . Hydrophilic PEG spacers increase solubility in aqueous media.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.