Using COC(=O)C1(CCNc2ccccc2Cl)CCCN1C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N1CCCC12CCN(c1ccccc1Cl)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.