Using COc1cc2ncnc(N3CCc4ccc(N)cc43)c2cc1OC, BrCCCCBr to produce COc1cc2ncnc(N3CCc4ccc(N5CCCC5)cc43)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.