Using COC(=O)c1cc2nc(Nc3c(Cl)cccc3Cl)[nH]c2c2nc(C3CC3)oc12 to produce O=C(O)c1cc2nc(Nc3c(Cl)cccc3Cl)[nH]c2c2nc(C3CC3)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.