Fluorinated quinolone antibacterial. Prepn: D. T. W. Chu, EP 131839; idem, US 4730000 (1985, 1988 both to Abbott); D. T. W. Chu et al., J. Med. Chem. 28, 1558 (1985); H. Narita et al., JP Kokai 85 237069 (1985 to Toyama). Comparative in vitro antibacterial spectrum: A. Digranes, W. L. Dibb, Chemotherapy 34, 298 (1988). In vivo antibacterial activity: P. B. Fernandes et al., Antimicrob. Agents Chemother. 29, 201 (1986). HPLC determn: J. F. Bauer et al., Pharm. Res. 7, 1177 (1990).