Used as an intermediate in organic synthesis, particularly in the development of pharmaceuticals and agrochemicals. It serves as a building block for constructing more complex molecules due to its reactive ester and lactone functionalities. Commonly employed in the preparation of coumarin derivatives, which exhibit biological activities such as anticoagulant, antimicrobial, and antioxidant properties. Also utilized in research settings for designing enzyme inhibitors and fluorescent probes. Its sulfonate group enhances solubility and reactivity in various coupling reactions, making it valuable in medicinal chemistry and materials science.