3-[6-amino-2-(3-hydroxy-2-{[1-(5-oxopyrrolidine-2-carbonyl)pyrrolidin-2-yl]formamido}propanamido)hexanamido]-3-({1-[(1-{[1-({[(1-{[1-carbamoyl-3-(methylsulfanyl)propyl]carbamoyl}-3-methylbutyl)carbamoyl]methyl}carbamoyl)-2-methylbutyl]carbamoyl}-2-phenylethyl)carbamoyl]ethyl}carbamoyl)propanoic acid