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The molecular structure of the polymyxin. It outlines the structural distinctions between polymyxin B and colistin. Polymyxin B and colistin comprise five conserved L-α-γ-diaminobutyric acid (Dab) residues. These residues confer a net positive charge to polymyxin compounds at physiological pH. The cationic hydrophilicity of this macrocycle is pivotal for their antibacterial properties.
