A phenylpyridylquinoline with diverse biological activities; induces DNA cleavage by calf thymus topoisomerase II; induces phage production in S. typhimurium from 1-10 μg/ml; inhibits DNA synthesis in and reduces survival of S. typhimurium bacteria at 10 μg/ml; bactericidal against E. coli in an iron-dependent manner; cytotoxic to human HT-29 colon carcinoma cells at 40 nM; inhibits mitosis and induces chromatin breaks in human leukocytes from 0.001-0.1 μg/ml; increases the mean survival time in rats infected with Rauscher virus at 0.05 mg/kg