Sulfo-Cyanine5.5 is a far red emitting fluorophore. It contains four sulfo groups, which provide great hydrophilicity, and aqueous solubility. The reagent can be conjugated with a variety of azides by means of copper catalyzed Click chemistry reaction.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.