Used as a multivalent building block in organic synthesis, particularly in the preparation of porous organic frameworks and covalent organic frameworks (COFs). Its four aldehyde groups enable cross-linking with amine-containing compounds through Schiff base reactions, facilitating the construction of rigid, conjugated network structures. These materials are explored for applications in gas storage, catalysis, and optoelectronics due to their high surface area and tunable porosity. Also employed in the synthesis of specialty resins and ligands for metal-organic complexes.