Using CCc1nc(Nc2cccnc2)cc(-c2cccc(OC)c2)n1, BrBr to produce COc1cccc(-c2cc(Nc3cccnc3)nc(CCBr)n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.