Using O=C(c1cc(Cl)c(Br)cn1)N1CCc2cc(F)ccc21, [I-] to produce O=C(c1cc(Cl)c(I)cn1)N1CCc2cc(F)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.