Using CC(C)(C)N, CC(C)(C)OC(=O)N1CCN(C(=O)OCc2ccccc2)C(C(=O)O)C1 to produce CC(C)(C)NC(=O)C1CN(C(=O)OC(C)(C)C)CCN1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.