Using ClC(Cl)(Cl)C(Cl)(Cl)Cl, COC(=O)[C@H](CO)NC(=O)OC(C)(C)C to produce COC(=O)[C@H](CCl)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.