label: cyanine dye
label_lc: cyanine dye
description: "Cyanine dyes are synthetic dyes with the general formula R2N[CH=CH]nCH=N(+)R2    <-> R2N(+)=CH[CH=CH]nNR2 (n is a small number) in which the nitrogen and part of the conjugated chain usually form part of a heterocyclic system, such as imidazole, pyridine, pyrrole, quinoline and thiazole."