4-(4-dimethylaminophenylazo)benzoyl-4-aminobutanoyl-isoleucyl-histidyl-prolyl-phenylalanyl-histidyl-leucyl-valyl-isoleucyl-histidyl-threonyl-5-((2-aminoethyl)amino)naphthalene-1-sulfonic acid
4-(4-dimethylaminophenylazo)benzoyl-4-aminobutanoyl-isoleucyl-histidyl-prolyl-phenylalanyl-histidyl-leucyl-valyl-isoleucyl-histidyl-threonyl-5-((2-aminoethyl)amino)naphthalene-1-sulfonic acid