Using O=C(O)C1CCc2ccccc2C1, CCCCCN1C(=O)C(N)c2ccccc21 to produce CCCCCN1C(=O)C(NC(=O)C2CCc3ccccc3C2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.