Using O=C(O)C1c2ccccc2-c2ccccc21, CN1C(=O)CC(=O)N(C)C1=O to produce CN1C(=O)C(C(=O)C2c3ccccc3-c3ccccc32)C(=O)N(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.