Using CC(C)(C)OC(=O)NCC(=O)N[C@@H]1C[C@@H](C(=O)N2CCN(c3cccc(Cl)c3)CC2)N(C(=O)OC(C)(C)C)C1 to produce NCC(=O)N[C@H]1CN[C@H](C(=O)N2CCN(c3cccc(Cl)c3)CC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.