Axispharm offers you high-purity CAS:2107273-62-9 N-methyl-N’-methyl-O-(m-PEG4)-O’-(propargyl-PEG4)-Cy3 is a flower containing excitation/emission maxima at 555/570 nm A cyan dye and an alkynyl PEG linker enable copper-catalyzed 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.