Used as an intermediate in the synthesis of biologically active compounds, particularly in pharmaceuticals and agrochemicals. It serves as a building block for heterocyclic compounds due to its reactive ester and alpha-keto functionalities. Commonly employed in the preparation of benzothiazole derivatives, which exhibit antimicrobial, antifungal, and anti-inflammatory properties. Also utilized in fluorescent dyes and optical brighteners owing to the inherent fluorescence of the benzothiazole core. Its versatility makes it valuable in medicinal chemistry research and development of functional materials.