Using CCOC(=O)[C@H](CCCCC1CCN(C(=O)OCc2ccccc2)CC1)N[C@@H](C)C(=O)N(CC(=O)OC(C)(C)C)C1Cc2ccccc2C1 to produce CCOC(=O)[C@H](CCCCC1CCNCC1)N[C@@H](C)C(=O)N(CC(=O)OC(C)(C)C)C1Cc2ccccc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.