Using Nc1cccc(N)n1, Cc1c(CBr)c(C)c(CBr)c(C)c1CBr to produce Cc1c(CNc2cccc(N)n2)c(C)c(CNc2cccc(N)n2)c(C)c1CNc1cccc(N)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.