Using O=C(NCCCC[C@H](NC(=O)OCC(Cl)(Cl)Cl)C(=O)O)OCC(Cl)(Cl)Cl, O=C1CCC(=O)N1O to produce O=C1CC(OC(=O)[C@H](CCCCNC(=O)OCC(Cl)(Cl)Cl)NC(=O)OCC(Cl)(Cl)Cl)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.