Used as a key building block in the synthesis of porphyrin-like macrocyclic compounds, particularly in the preparation of expanded porphyrins and pyridyl-containing ligands. Its structure enables metal coordination, making it valuable in the development of catalysts and sensors. Commonly employed in supramolecular chemistry for constructing functional architectures due to its ability to form stable complexes with transition metals. Also applied in the design of photoactive materials and molecular recognition systems.