<unk>  (polymyxin E) is a polymyxin antibiotic produced by certain strains of Bacillus polymyxa var.<unk> us.<unk>  is a mixture of cyclic polypeptides<unk>  A and B.<unk>  is effective against Gram-negative bacilli, except Proteus and Burkholderia cepacia.
Colistin
Meropenem
Biapenem
Vancomycin 
Ertapenem
Fosfomycin
Imipenem-Cilastatin
Teicoplanin