An antimycobacterial compound; inhibits the growth of M. tuberculosis in vitro at a concentration of 10 μg/ml; protective against M. smegmatis infections in rhesus monkeys (50, 30, and 0% fatalities at doses of 12.5, 25, and 50 mg/kg, respectively); clears M. smegmatis pulmonary infiltrates at a dose of 100 mg/kg