Trisulfo-Cy3-Alkyne is a water-soluble cyanine dye linker with an alkyne group facilitating attachment to azide-modified molecules via Click Chemistry. This compound acts as a fluorophore, readily detectable with various fluorescent devices due to its brightness and stability. Suitable for research applications, Trisulfo-Cy3-Alkyne can be visualized in gels even at nanomolar quantities and undergoes copper-catalyzed azide-alkyne cycloaddition for bioconjugation processes [1].