N-(2-aminobenzoyl-alanyl-alanyl-phenylalanyl-phenylalanyl-alanyl-alanyl)-N'-2,4-dinitrophenylethylenediamine
n-(2-aminobenzoyl-alanyl-alanyl-phenylalanyl-phenylalanyl-alanyl-alanyl)-n'-2,4-dinitrophenylethylenediamine