Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of sulfa-based drugs and antimicrobial agents. It plays a key role in introducing sulfonamide functional groups into target molecules through reactions with amines. Commonly applied in the preparation of biologically active compounds, including anti-inflammatory and antidiabetic agents. Also utilized in agrochemical synthesis for creating herbicides and plant growth regulators. Its reactivity makes it valuable in organic synthesis for constructing complex aromatic frameworks.