Used in the synthesis of fluorescently labeled oligonucleotides for applications such as real-time PCR, microarray analysis, and fluorescence in situ hybridization (FISH). Enables detection and quantification of specific DNA or RNA sequences with high sensitivity due to strong red fluorescence emission. Ideal for multiplex assays when combined with other fluorophores. Incorporated directly during solid-phase oligonucleotide synthesis, ensuring precise positioning and consistent labeling efficiency.