COOH H N Norfloxacin Profi oxacin ofloxacin COOH COOH COOH H3C 3 HN CH CH3 Levofloxacin Lomefloxacin Enoxacin COOH H3C F F H2N H Tosufloxacin Temafloxacin TrovafloxacinN N COOH CH3 HN F O N N COOH HN F O N N COOH N F O O H CH3 3C Norfloxacin Ciprofloxacin Ofloxacin N N COOH N F O O CH3 H H3C N N COOH CH3 HN F O H3C F N N N COOH CH3 HN F O Levofloxicin Lomefloxacin Enoxacin N N N COOH O H2N F F F N N COOH O F F F HN H3C N N N COOH O F F F H2N H H Tosufloxacin Temafloxacin Trovafloxacin