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Cy5 DBCO is a linker of the cyanine5 dye. The addition of the DBCO molecule allows for the compound to undergo copper-free Click Chemistry reactions.

Cy5 DBCO chloride is an azide reaction probe and the addition of DBCO molecules allows the imaging of azide-labelled biomolecules by a copper-free "Click Chemistry" reaction[1]. Cy5 DBCO (chloride) is a click chemistry reagent, it contains a DBCO group that can undergo strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules containing Azide groups.

[1] Sun-Woong Kang, et al. Cell labeling and tracking method without distorted signals by phagocytosis of macrophages. Theranostics. 2014 Feb 12;4(4):420-31. DOI:10.7150/thno.7265