COOH COOH H2N Haco Nadifloxacin Gemifloxacin CH3 O H3C COOH OCH H OCH3 Moxifloxacin Balofloxacin GrepafloxacinN N F COOH O HO CH3 N N N F COOH O H2N H3CO N Nadifloxacin Gemifloxacin N N F COOH O OCH3 NH H H N F COOH O OCH3 N HN H3C N F COOH O N HN H3C CH3 Moxifloxacin Balofloxacin Grepafloxacin