Figure 1.

Figure 1a: Colistin chemical structure: Colistin A (as shown) fatty acid is 6-methyloctanoic acid. Colistin B fatty acid is 6-methylheptanoic acid.
Figure 1b: CMS chemical structure: CMS A fatty acid is 6-methyloctanoic acid. CMS B fatty acid is 6-methylheptanoic acid.
Figure 1c: Polymyxin B chemical structure: Polymyxin B1 fatty acid is 6-methyloctanoic acid. Polymyxin B2 fatty acid is 6-methylheptanoic acid.
Figure 1d: Polymyxin B nonapeptide chemical structure.
Figure 1e: Azithromycin chemical structure.



