Using COC(=O)c1cn2c(C=O)cnc2c(Cl)c1Nc1ccc(Br)cc1Cl, CN to produce CNCc1cnc2c(Cl)c(Nc3ccc(Br)cc3Cl)c(C(=O)OC)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.