Using O=C(N[C@@H]1CCCc2ccccc21)[C@@H]1CN(C(=O)OCc2ccccc2)CCN1, CC(C)[C@H](NC(=O)OC(C)(C)C)C(=O)O to produce CC(C)[C@H](NC(=O)OC(C)(C)C)C(=O)N1CCN(C(=O)OCc2ccccc2)C[C@H]1C(=O)N[C@@H]1CCCc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.