A quinolone antibiotic; active against Gram-positive and Gram-negative bacteria including S. aureus and E. coli (MICs = 10 and 1 μg/ml, respectively); inhibits growth of nalidixic acid-sensitive strains of E. coli in an in vitro model of bacterial cystitis at 10 and 50 mg/L; active against chloroquine-sensitive and -resistant strains of P. falciparum in vitro (IC50s = 41.4 and 14.4 μg/ml, respectively) and against hepatic stages of P. yoelii yoelii (IC50 = 21.6 μg/ml)