Using CC(C)(C)OC(=O)N1C[C@@H]2C[C@H]1CN2C(=O)c1cccc(Cl)c1Cl to produce O=C(c1cccc(Cl)c1Cl)N1C[C@@H]2C[C@H]1CN2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.