Using C=C[Sn](CCCC)(CCCC)CCCC, CC1(C)Oc2cc([N+](=O)[O-])cc(Br)c2N(c2ccc(F)cc2)C1=O to produce C=Cc1cc([N+](=O)[O-])cc2c1N(c1ccc(F)cc1)C(=O)C(C)(C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.