Using ClC(Cl)(Cl)C(Cl)(Cl)Cl, CC(C)(C)OC(=O)N1CCc2cc(-c3coc4c(I)cnc(N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)c34)ccc21 to produce CC(C)(C)OC(=O)N1CCc2cc(-c3coc4c(Cl)cnc(N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)c34)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.