Syringomycin E (SR-E) is a phytotoxin of the cyclic lipodepsinonapeptides class composed of a 3-hydroxy fatty acid tail attached to a polar peptide head that contains nine amino acid residues. It is a potent biosurfactant, which is toxic to many plants and fungi and is implicated as a virulence factor in several major plant diseases such as holcus spot disease of maize and bacterial canker of stone fruits.