Using C=C(OCC)[Sn](CCCC)(CCCC)CCCC, CC(C)(C)C(=O)Nc1ccc(Br)cc1F to produce CC(=O)c1ccc(NC(=O)C(C)(C)C)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.