Synonyms: PolymyxinD1, 6-D-phenylalanine-; 1,4,7,10,13,16,19-Heptaazacyclotricosane, cyclicpeptide deriv.; L-Threonine, N2-(6-methyl-1-oxooctyl)-L-2,4-diaminobutanoyl-L-threonyl-D-seryl-L-2,4-diaminobutanoyl-L-2,4-diaminobutanoyl-D-phenylalanyl-L-threonyl-L-2,4-diaminobutanoyl-L-2,4-diaminobutanoyl-,cyclic (10®4)-peptide