Product Description: Sulfo-Cy3-NHS disodium is a derivative of Cy3 (Cyanine3) (HY-D0822) dye containing sulfonate ions. Sulfo-Cy3-NHS disodium contains sulfonate ions and has improved water solubility. Sulfo-Cy3-NHS disodium can label biomolecules containing amine groups, such as proteins, antibodies or peptides.