Features: Water soluble amine-reactive pentamethine cyanine with an intrinsic single negative charge. Used to label proteins, antibodies, drugs and nucleotides. Forms stable amide bond with primary amines via carbodiimide activation. Name: Potassium 2-((1E,3E,5E)-5-(1-(5-carboxypentyl)-3,3-dimethyl-5-sulfonatoindolin-2-ylidene)- 1,3-dienyl)-1-ethyl-3,3-dimethyl-3H-indolium-5-sulfonate NHS ester Linear formula: C37H42KN3O10S2 Molecular weight: 791.97 g/mol Solubility: Water, methanol, DMSO, DMF Storage: -20 °C, Photosensitive λabs,max: 648 nm (CH3OH) λem,max: 667 nm (CH3OH) ε: 250000 M-1cm-1 (CH3OH) Assay: ≥ 95%