Using Cn1c(I)c(I)c2c(=O)[nH]c(NC(=O)C(C)(C)C)nc21 to produce Cn1cc(I)c2c(=O)[nH]c(NC(=O)C(C)(C)C)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.