Using [N-]=[N+]=[N-], CC(C)=CCC/C(C)=C/CC/C(C)=C/CBr to produce CC(C)=CCC/C(C)=C/CC/C(C)=C/CN=[N+]=[N-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.