Cy5.5-PEG-DBCO (MW 2000)

Cy5.5-PEG-DBCO (MW 2000) is a near-infrared fluorescent probe designed for bioorthogonal labeling via SPAAC click chemistry with azides. It is widely used for in vivo imaging and in vitro biomolecule conjugation due to its water-soluble PEG linker and Cy5.5 dye's deep tissue penetration.