Using CCOC(=O)CN1CCN(C(=O)OC(C)(C)C)C(c2ccccc2)C1=O to produce CC(C)(C)OC(=O)N1CCN(CC(=O)O)C(=O)C1c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.