Using COC(=O)c1cn2ccnc2c(Cl)c1Nc1ccc(Br)cc1Cl to produce O=C(O)c1cn2ccnc2c(Cl)c1Nc1ccc(Br)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.