Using O=C([O-])[O-], CC1=Cc2cccc(CCNS(=O)(=O)c3ccc(C)cc3)c2C1 to produce CC1=Cc2cccc(CCN(C)S(=O)(=O)c3ccc(C)cc3)c2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.