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Structures of compounds that lowered colistin MICs most effectively in KPB9 (top) and AB4106 (bottom). Streptovaricin C and carbomycin lowered the KPB9 colistin MIC from 512 to 1 μg/mL. Streptovaricin G, rifamycin, 3-[(dimethylamino)methyl]-(9CI), and borrelidin lowered the AB4106 colistin MIC from 1024 to 2 μ/mL.
