Using FC(F)(F)C(F)(F)C(F)(F)C(F)(F)I, Nc1ccc(I)cc1F to produce Nc1ccc(C(F)(F)C(F)(F)C(F)(F)C(F)(F)F)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.