DusQ 21 has a strong absorption maximum at 661 nm, and it has broad absorption in the far-infrared and NIR ranges, which can quench the fluorescence of dyes emitting in this region. It is a common quencher for Cyanine5, Cyanine5.5, AF 647, or other spectrally similar fluorochromes.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.
