Axispharm offers you CAS:2107273-70-9 N-(azide-PEG3)-N’-(Amine-C3-PEG4)-Cy5, a PEG derivative containing a cyanine dye with excitation/emission maxima at 649/667 nm, which contains The azide group 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.