Using CN(CC1CC(C)(O)c2ccc(S(=O)(=O)c3ccccc3)cc2O1)C(=O)OC(C)(C)C to produce CNCC1CC(C)(O)c2ccc(S(=O)(=O)c3ccccc3)cc2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.