Using O=C(Nc1ccc(N2CCOCC2=O)cc1)[C@H]1C[C@@H](O)CN1C(=O)Nc1ccc(Cl)cc1 to produce O=C1C[C@H](C(=O)Nc2ccc(N3CCOCC3=O)cc2)N(C(=O)Nc2ccc(Cl)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.