COOH COOH COOH NH2 O OCH3 Pazufloxacin Gatifl oxacin Pefloxacin NH2 O COOH COOH F CH Rufloxacin Fleroxacin SparfloxacinN COOH NH2 F O O CH3 H N N COOH HN F O H3C OCH3 N N COOH HN F O CH3 Pazufloxacin Gatifloxacin Pefloxacin N N COOH N F O H3C S N N COOH N F O H3C F F N N COOH HN F O F NH2 H3C CH3 Rufloxacin Fleroxacin Sparfloxacin