Using O=C1NC(=O)c2ccccc21, CC(Cl)c1cc2c(Cl)cccc2nc1Cl to produce CC(c1cc2c(Cl)cccc2nc1Cl)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.