circulin A

Isoleucinepolymyxin E1

N2-(6-Methyloctanoyl-L-A2bu-L-Thr-L-A2bu-)cyclo(L-A2bu*-L-A2bu-D-Leu-L-Ile-L-A2bu-L-A2bu-L-Thr-)

N2-(6-Methyl-1-oxooctyl-L-A2bu-L-Thr-L-A2bu-)cyclo(L-A2bu*-L-A2bu-D-Leu-L-Ile-L-A2bu-L-A2bu-L-Thr-)