Synonyms: CirculinA (7CI,8CI); Circulin A (Bacillus circulans) (9CI);1,4,7,10,13,16,19-Heptaazacyclotricosane, cyclic peptide deriv.; (2S)-4-Amino-2-[[(6S)-6-methyl-1-oxooctyl]amino]butanoyl-L-threonyl-(2S)-2,4-diaminobutanoyl-(2S)-2,4-diaminobutanoyl-(2S)-2,4-diaminobutanoyl-D-leucyl-L-isoleucyl-(2S)-2,4-diaminobutanoyl-(2S)-2,4-diaminobutanoyl-L-threonine(10®4)-lactam; Colistin III