Molecular formula: C34H38N3KO10S2, Molecular weight: 751.91, Appearance: dark red crystals, Solubility: soluble in water (0.62 M = 47 g/L), in polar organic solvents (DMF, DMSO); Water-soluble, amine-reactive sulfo-Cyanine3 dye is a popular fluorophore for a variety of fluorescent applications. This hydrophilic and water-soluble type of Cyanine3 is ideal for complex protein labeling.