Using CS(=O)(=O)Nc1ccc(CCNCC2CCc3ccccc3C2=O)cc1 to produce CS(=O)(=O)Nc1ccc(CCNCC2CCc3ccccc3C2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.