Quinolones have a long and rich history as chemotherapeutic antibacterial agents that eradicate bacteria by interfering with DNA replication, transcription, and repair. 1 Their broad spectrum activity results from the inhibition of bacterial DNA gyrase and topoisomerase IV. 2 Certain sub-classes of quinolones have also been reported to be active against cancer cells by means of inhibiting human Topoisomerases I and II. 3 We have recently discovered a new class ...