Using CC(C)(C)OC(=O)CN1CCN(C(=O)CNC(=O)OCc2ccccc2)[C@@H](CCCNC(=O)OC(C)(C)C)C1=O to produce NCCC[C@H]1C(=O)N(CC(=O)O)CCN1C(=O)CN, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.