<unk>  is an older synthetic antibiotic of the fluoroquinolone drug class undergoing clinical trials prior to a possible NDA (New Drug Application) submission to the U.S. Food and Drug Administration (FDA). It is a prodrug which is  metabolized in the body to the active compound ulifloxacin. It was developed over two decades ago by Nippon Shinyaku Co. and was patented in Japan in 1987 and in the United States in 1989.
It has been approved for the treatment of uncomplicated and complicated urinary tract infections, community-acquired respiratory tract infections in Italy and gastroenteritis, including infectious diarrheas, in Japan.<unk>  has not been approved for use in the United States.
Prulifloxacin
Telithromycin
Azithromycin 
Dirithromycin
Roxithromycin
Difloxacin
Moxifloxacin 
Gemifloxacin