Used as a key intermediate in the synthesis of fluorescent dyes and sensors, particularly in the development of pH indicators and metal ion probes. Its brominated structure allows for further functionalization via cross-coupling reactions, making it valuable in organic electronics and photochemical research. Commonly employed in the preparation of xanthene-based fluorophores used in biological imaging and labeling due to high photostability and tunable emission properties. Also finds use in the design of photoacid generators and light-responsive materials for advanced material science applications.