Using O=C([O-])[O-], CCCS(=O)(=O)N1CCC(CNC(=O)c2ccc(Cl)cc2Cl)(c2ncccc2O)CC1 to produce CCCS(=O)(=O)N1CCC(CNC(=O)c2ccc(Cl)cc2Cl)(c2ncccc2OC)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.