Using COC(=O)C(C)(C)Br, CSc1nccc(-c2cn[nH]c2I)n1 to produce COC(=O)C(C)(C)n1cc(-c2ccnc(SC)n2)c(I)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.