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Cy3B NHS ester is a fluorescent dye compound that is commonly used in biomarking and fluorescent labeling experiments, especially for labeling biomolecules containing amino functional groups (amine groups), such as proteins, antibodies or peptides.

ChEBI: Cy3B dye NHS ester is a fluorescent dye with a maximum emission wavelength of 572 nm, derived from a heteroheptacyclic ring system. It has a role as a fluorochrome. It is an iminium betaine, an organic heteroheptacyclic compound and a cyanine dye.