142563-40-4 Cyclo(A2bu-A2bu-phe-leu-A2bu-A2bu-thr) Cyclo(dab-dab-phe-leu-dab-dab-thr) sulfate salt Cyclo(diaminobutyryl-diaminobutyryl-phenylalanyl-leucyl-diaminobutyryl-diaminobutyryl-threonyl) PBHP Polymyxin B heptapeptide Polymyxin B1, 1-de(N2-(6-methyl-1-oxooctyl)-L-2,4-diaminobutanoic acid)-2-de-L-threonine-3-de(L-2,4-diaminobutanoic acid)-, sulfate