Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of sulfonamide-based drugs. It serves as a building block in organic reactions where the aldehyde group enables further functionalization, such as in condensation reactions or reductive amination. Its structure supports the creation of biologically active molecules, including potential anti-inflammatory and antimicrobial agents. Also employed in the preparation of specialty polymers and ligands for catalysis due to its rigid aromatic framework and reactive functional groups.