Using [I-], CS(=O)(=O)OCCCC(F)(F)C(F)(F)C(F)(F)C(F)(F)F to produce FC(F)(F)C(F)(F)C(F)(F)C(F)(F)CCCI, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.