Time-kill kinetics of BT_03F04 and BT_04B09 against selected bacteria. The activity of BT_03F04 against growths of (A) E. faecalis and (B) S. pneumoniae. The activity of BT_04B09 against (C) S. pneumoniae and (D) S. aureus. Compounds were added to bacterial cultures at 4× MIC. Samples were analyzed by plating and determination of colony-forming units (CFUs) at 0, 2, 4, 6, and 24 h. Diamonds (♦) represent cultures containing the test compounds, and filled circles (●) represent control cultures grown in the absence of compounds.