Used as a building block in organic synthesis, particularly in the development of fluorescent dyes and probes due to its strong electron-donating properties. Its rigid structure enhances photostability and quantum yield in dye molecules. Commonly employed in the design of sensors for detecting metal ions and biomolecules. Also found in some pharmaceutical intermediates where nitrogen-containing heterocycles are required. Shows potential in materials science for optoelectronic applications, including organic light-emitting diodes (OLEDs).