Using CCCCC([Sn])=C(CCCC)CCCC, Cc1cc([N+](=O)[O-])ccc1-n1cccc(Br)c1=O to produce C=Cc1cccn(-c2ccc([N+](=O)[O-])cc2C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.