Cyanine7.5 tetrazine for tetrazine ligation contains a near infrared fluorophore suitable for in vivo imaging.
Absorption and emission spectra of Cyanine7.5 are similar to ICG (indocyanine green), but Cyanine7.5 is significantly brighter.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.