Using CN(CC(F)(F)C(F)(F)C(F)(F)F)S(=O)(=O)CCCCCCl, [I-] to produce CN(CC(F)(F)C(F)(F)C(F)(F)F)S(=O)(=O)CCCCCI, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.