Axispharm offers you high purity CAS:2107273-46-9 N,N’-bis-(azide-PEG3)-Cy5 is a cyanine dye PEG linker with excitation/emission maxima at 649/667 nm, it contains two azide groups, Click Chemistry can be realized. 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.