3-{[5-(1H-indol-3-ylmethyl)-2-(carbamoylmethyl)-1,4,7-trioxo-3,6-diazahexadec-1-yl]amino}-4-{[24-(3-aminopropyl)-3-benzyl-15,21-bis(carboxymethyl)-6-(1-carboxyprop-2-yl)-9-(hydroxymethyl)-18,31-dimethyl-2,5,8,11,14,17,20,23,26,29-decaoxo-4,7,10,13,16,19,22,25,28-nonaza-1-oxacyclohentriacontan-30-yl]amino}-4-oxobutanoic acid