Used as a key intermediate in the synthesis of cyanine dyes, particularly in the production of near-infrared fluorescent dyes for bioimaging and labeling biomolecules. Its structure allows for extended conjugation, making it valuable in developing dyes with high molar absorptivity and fluorescence in the NIR region. Also employed in the preparation of photoconductors and sensitizers for photodynamic therapy and organic semiconductors. Commonly utilized in research settings for developing optical sensors and probes due to its photostability and strong absorbance characteristics.