Sulfo-Cyanine5.5 carboxylic acid (CI Pigment violet 32) is a water-soluble, far-red emitting fluorophore. With four sulfo groups, this dye is negatively charged at neutral pH and highly hydrophilic. As a cyanine dye, Sulfo-Cyanine5.5 exhibits low pH-dependent fluorescence and possesses a high extinction coefficient.
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