Using O=C(Cl)c1ccc(Cl)c(Cl)c1, COc1cccc(Cl)c1Cl to produce COc1ccc(C(=O)c2ccc(Cl)c(Cl)c2)c(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.