{(1S)-1-BENZYL-4-[3-CARBAMOYL-1-(1-CARBAMOYL-2-PHENYL-ETHYLCARBAMOYL)-(S)-PROPYLCARBAMOYL]-2-OXO-5-PHENYL-PENTYL}-CARBAMIC ACID TERT-BUTYL ESTER CC(C)(C)OC(=O)N[C@@H](Cc1ccccc1)C(=O)C[C@@H](Cc2ccccc2)C(=O)N[C@@H](CCC(=O)N)C(=O)N[C@@H](Cc3ccccc3)C(=O)N Q50