Using O=C([O-])[O-], CCOC(=O)c1oc2cccc(NS(C)(=O)=O)c2c1C to produce CCOC(=O)c1oc2cccc(N(C)S(C)(=O)=O)c2c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.