Fluorescein-PEG12-amide, TFA salt is a PEG linker containing an amine and a fluorescein dye. Primary amines readily form amides with carboxylic acids in the presence of reagents such as HATU or EDC while fluorescein is a fluorophore is a near-UV/Vis spectrum dye that can be used for in vivo fluorescence assays such as FRET.
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