Using CC(=O)c1ccc(OS(=O)(=O)C(F)(F)F)cc1C, CCCC[Sn](CCCC)(CCCC)c1ccco1 to produce CC(=O)c1ccc(-c2ccco2)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.