(2S)-2-[(2S)-2-[(2S)-2-{[(2S)-1-[(2S)-1-[(2S)-2-{[(2S)-1-[(2S)-1-[(2S)-1-[(2S)-2-amino-3-methylbutanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidin-2-yl]formamido}-3-methylbutanoyl]pyrrolidine-2-carbonyl]pyrrolidin-2-yl]formamido}-5-carbamimidamidopentanamido]-5-carbamimidamidopentanamido]-5-carbamimidamidopentanoic acid