H 1970, (S)-2-((S)-2-((S)-1-((S)-2-((S)-2-(2-((S)-1-((S)-1-((S)-2-Amino-5-guanidinopentanoyl)pyrrolidine-2-carbonyl)pyrrolidine-2-carboxamido)acetamido)-3-phenylpropanamido)-3-hydroxypropanoyl)pyrrolidine-2-carboxamido)-3-phenylpropanamido)-5-guanidinopentanoic Acid