Using O=C(c1cccnc1)c1c(-c2ccc(Cl)cc2Cl)noc1-c1ccccc1Cl to produce OC(c1cccnc1)c1c(-c2ccc(Cl)cc2Cl)noc1-c1ccccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.