Acetamiohexanoyl]amino}-9-benzyl- 6-(3-carbamimidamidopropyl)-12- (1H-imidazol-5-ylmethyl)-3-(1H-indol- 3-ylmethyl)-2,5,8,11,14,17-hexaoxo- 1,4,7,10,13,18-hexaazacyclotricosane -23-carboxylic acid