Used as a key intermediate in the synthesis of high-performance organic semiconductors and fluorescent dyes. Its rigid xanthene backbone enhances photostability and electron delocalization, making it valuable in developing sensors and optoelectronic materials. Also employed in the preparation of metal-organic frameworks (MOFs) due to its ability to chelate metal ions through carboxylic acid groups. The bulky tert-butyl groups improve solubility and prevent aggregation in solid-state applications.