RB-PEG-N3 (MW 400) (Rhodamine B-PEG-N3 (MW 400)) is a fluorescent dye composed of Rhodamine B, PEG, and an azide group (N3). It functions as a click chemistry reagent, utilizing its azide group to participate in copper-catalyzed azide-alkyne cycloaddition reactions (CuAAC) with alkynyl-containing molecules. Additionally, it can engage in strain-promoted azide-alkyne cycloaddition (SPAAC) with molecules containing DBCO or BCN groups, exhibiting excitation/emission at 546/610 nm.
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