Cy3-PEG2-TCO4

This Cy3 dye derivative, featuring a polyethylene glycol linker and a trans-cyclooctene (TCO) group, is designed for rapid, bioorthogonal conjugation via inverse electron-demand Diels-Alder (iEDDA) click chemistry with tetrazine probes. It is widely used for fluorescence labeling in live-cell imaging, in vivo targeting, and tracking biomolecules in research.