| abstract |
(57) [Summary] [Structure] A labeling complex for supporting a labeling substance on a biological substance, for specifically binding the biological substance and an analyte to detect the analyte by optical means. At As the labeling material, a trinuclear dye compound represented by the following general formula or a compound having an isomeric structure in which the nitrogen atom at the 4-position of the heterocycle in the formula is at the 5-position is used. [Chemical 1] [Chemical 2] [Effect] Since this labeled complex has a large Stokes shift, the excitation light and the fluorescence can be easily separated in the detection, and the S / N ratio of the detection is high. Further, this product is stable with little change in the fluorescence intensity in water. Therefore, a reagent having excellent storage stability can be provided. |