Using COC(=O)c1ccc(/C=C/S(C)(=O)=O)c(OCCc2cccc(C)c2)c1 to produce COC(=O)c1ccc(CCS(C)(=O)=O)c(OCCc2cccc(C)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.