Using CI, COCC(=O)NC[C@H]1OCCN(C(=O)OC(C)(C)C)C[C@H]1c1ccc(Cl)c(Cl)c1 to produce COCC(=O)N(C)C[C@H]1OCCN(C(=O)OC(C)(C)C)C[C@H]1c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.