Using C=C[Sn](CCCC)(CCCC)CCCC, Cc1cc(Br)n(-c2ccc([N+](=O)[O-])cc2)n1 to produce C=Cc1cc(C)nn1-c1ccc([N+](=O)[O-])cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.