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Sulfo-Cyanine 5 free acid A81355 (Legacy code 810355) potassium 1-(5-carboxypentyl)-3,3-dimethyl-2-((1E,3E)-5-((E)-1,3,3-trimethyl-5-sulfonatoindolin-2-ylidene)penta-1,3-dien-1-yl)-3H-indol-1-ium-5-sulfonate
Sulfo-Cyanine5 free acid is a water-soluble red fluorescent probe that can be used to label various biomolecules such as proteins. This probe is useful in fluorescent imaging due to its intense emission in the red spectrum.