Using O, O=C(Nc1ccc2ccc(Cl)nc2n1)c1cc(Cl)ccc1C(Cl)Cl to produce O=C1c2cc(Cl)ccc2C(O)N1c1ccc2ccc(Cl)nc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.