Using COC(=O)c1cc2cc(Oc3ccc(S(C)(=O)=O)cn3)cc(OC)c2[nH]1 to produce COc1cc(Oc2ccc(S(C)(=O)=O)cn2)cc2cc(C(=O)O)[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.