Used as a key intermediate in the synthesis of fluorophores and fluorescent dyes, particularly in the development of bioimaging agents. Its structure supports the creation of xanthone-based probes with enhanced photostability and fluorescence quantum yield. Commonly applied in research settings for labeling biomolecules and in the design of sensors for metal ions or pH due to its responsive optical properties. Also explored in photodynamic therapy and organic electronics for its light-emitting characteristics.