Using COCn1ccnc1C(O)(c1ccc(Cl)cc1Cl)c1ccc(Cl)cc1Cl to produce OC(c1ncc[nH]1)(c1ccc(Cl)cc1Cl)c1ccc(Cl)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.