Using CCCCOc1nc(N)c2c(n1)N(Cc1cnc(Cl)c(Cl)c1)C(O)(Br)N2 to produce CCCCOc1nc(N)c2nc(O)n(Cc3cnc(Cl)c(Cl)c3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.