Used as a key intermediate in the synthesis of fluoroquinolone antibiotics, particularly in the production of third-generation quinolones like gatifloxacin and moxifloxacin. Its structure provides the essential quinoline core that contributes to the antibacterial activity of the final drug. It enables the introduction of specific side chains necessary for enhanced potency, broader spectrum activity, and improved pharmacokinetics. Commonly employed in pharmaceutical research and development for constructing bioactive molecules targeting DNA gyrase and topoisomerase IV in bacteria.