– Cy3 dimethyl iodide, a dye derivative of Cyanine 3 (Cy3), features a dimethyl group in its iodide salt form, enhancing its water solubility for usage in aqueous solutions. Cy3, a near-infrared fluorescent dye, is frequently employed in biolabeling and cell imaging, binding to biomolecules like proteins and antibodies to monitor their location and dynamics in biological samples.