Using [I-], COC(=O)CC1CCc2cc(Br)cc3[nH]c(=O)c(=O)n1c23 to produce COC(=O)CC1CCc2cc(I)cc3[nH]c(=O)c(=O)n1c23, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.